diff --git a/404.html b/404.html
index 01732cda..d9275b66 100644
--- a/404.html
+++ b/404.html
@@ -9,69 +9,56 @@
         
         <link rel="shortcut icon" href="/img/favicon.ico">
         <title>IXWebSocket</title>
-        <link href="/css/bootstrap-custom.min.css" rel="stylesheet">
+        <link href="/css/bootstrap.min.css" rel="stylesheet">
         <link href="/css/font-awesome.min.css" rel="stylesheet">
         <link href="/css/base.css" rel="stylesheet">
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css">
-        <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
-        <!--[if lt IE 9]>
-            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
-            <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
-        <![endif]-->
 
         <script src="/js/jquery-1.10.2.min.js" defer></script>
-        <script src="/js/bootstrap-3.0.3.min.js" defer></script>
+        <script src="/js/bootstrap.min.js" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
         <script>hljs.initHighlightingOnLoad();</script> 
     </head>
 
     <body>
-
-        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+        <div class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
             <div class="container">
-
-                <!-- Collapsed navigation -->
-                <div class="navbar-header">
-                    <!-- Expander button -->
-                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-                        <span class="sr-only">Toggle navigation</span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                    </button>
-                    <a class="navbar-brand" href="/.">IXWebSocket</a>
-                </div>
+                <a class="navbar-brand" href="/.">IXWebSocket</a>
+                <!-- Expander button -->
+                <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbar-collapse">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
 
                 <!-- Expanded navigation -->
-                <div class="navbar-collapse collapse">
+                <div id="navbar-collapse" class="navbar-collapse collapse">
                         <!-- Main navigation -->
                         <ul class="nav navbar-nav">
-                            <li >
-                                <a href="/.">Home</a>
+                            <li class="navitem">
+                                <a href="/." class="nav-link">Home</a>
                             </li>
-                            <li >
-                                <a href="/CHANGELOG/">Changelog</a>
+                            <li class="navitem">
+                                <a href="/CHANGELOG/" class="nav-link">Changelog</a>
                             </li>
-                            <li >
-                                <a href="/build/">Build</a>
+                            <li class="navitem">
+                                <a href="/build/" class="nav-link">Build</a>
                             </li>
-                            <li >
-                                <a href="/cobra/">Cobra</a>
+                            <li class="navitem">
+                                <a href="/cobra/" class="nav-link">Cobra</a>
                             </li>
-                            <li >
-                                <a href="/design/">Design</a>
+                            <li class="navitem">
+                                <a href="/design/" class="nav-link">Design</a>
                             </li>
-                            <li >
-                                <a href="/usage/">Examples</a>
+                            <li class="navitem">
+                                <a href="/usage/" class="nav-link">Examples</a>
                             </li>
-                            <li >
-                                <a href="/ws/">Ws</a>
+                            <li class="navitem">
+                                <a href="/ws/" class="nav-link">Ws</a>
                             </li>
                         </ul>
 
-                    <ul class="nav navbar-nav navbar-right">
-                        <li>
-                            <a href="#" data-toggle="modal" data-target="#mkdocs_search_modal">
+                    <ul class="nav navbar-nav ml-auto">
+                        <li class="nav-item">
+                            <a href="#" class="nav-link" data-toggle="modal" data-target="#mkdocs_search_modal">
                                 <i class="fa fa-search"></i> Search
                             </a>
                         </li>
@@ -81,6 +68,7 @@
         </div>
 
         <div class="container">
+            <div class="row">
 
     <div class="row-fluid">
       <div id="main-content" class="span12">
@@ -90,6 +78,7 @@
     </div>
 
 
+            </div>
         </div>
 
         <footer class="col-md-12">
@@ -103,19 +92,19 @@
         <script src="/js/base.js" defer></script>
         <script src="/search/main.js" defer></script>
 
-        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="Search Modal" aria-hidden="true">
-    <div class="modal-dialog">
+        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="searchModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="searchModalLabel">Search</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Search</h4>
             </div>
             <div class="modal-body">
                 <p>
                     From here you can search these documents. Enter
                     your search terms below.
                 </p>
-                <form role="form">
+                <form>
                     <div class="form-group">
                         <input type="text" class="form-control" placeholder="Search..." id="mkdocs-search-query" title="Type search term here">
                     </div>
@@ -126,12 +115,12 @@
             </div>
         </div>
     </div>
-</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="Keyboard Shortcuts Modal" aria-hidden="true">
+</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="keyboardModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="keyboardModalLabel">Keyboard Shortcuts</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Keyboard Shortcuts</h4>
             </div>
             <div class="modal-body">
               <table class="table">
diff --git a/CHANGELOG/index.html b/CHANGELOG/index.html
index 7da94ac2..bdaa2130 100644
--- a/CHANGELOG/index.html
+++ b/CHANGELOG/index.html
@@ -9,79 +9,66 @@
         
         <link rel="shortcut icon" href="../img/favicon.ico">
         <title>Changelog - IXWebSocket</title>
-        <link href="../css/bootstrap-custom.min.css" rel="stylesheet">
+        <link href="../css/bootstrap.min.css" rel="stylesheet">
         <link href="../css/font-awesome.min.css" rel="stylesheet">
         <link href="../css/base.css" rel="stylesheet">
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css">
-        <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
-        <!--[if lt IE 9]>
-            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
-            <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
-        <![endif]-->
 
         <script src="../js/jquery-1.10.2.min.js" defer></script>
-        <script src="../js/bootstrap-3.0.3.min.js" defer></script>
+        <script src="../js/bootstrap.min.js" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
         <script>hljs.initHighlightingOnLoad();</script> 
     </head>
 
     <body>
-
-        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+        <div class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
             <div class="container">
-
-                <!-- Collapsed navigation -->
-                <div class="navbar-header">
-                    <!-- Expander button -->
-                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-                        <span class="sr-only">Toggle navigation</span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                    </button>
-                    <a class="navbar-brand" href="..">IXWebSocket</a>
-                </div>
+                <a class="navbar-brand" href="..">IXWebSocket</a>
+                <!-- Expander button -->
+                <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbar-collapse">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
 
                 <!-- Expanded navigation -->
-                <div class="navbar-collapse collapse">
+                <div id="navbar-collapse" class="navbar-collapse collapse">
                         <!-- Main navigation -->
                         <ul class="nav navbar-nav">
-                            <li >
-                                <a href="..">Home</a>
+                            <li class="navitem">
+                                <a href=".." class="nav-link">Home</a>
                             </li>
-                            <li class="active">
-                                <a href="./">Changelog</a>
+                            <li class="navitem active">
+                                <a href="./" class="nav-link">Changelog</a>
                             </li>
-                            <li >
-                                <a href="../build/">Build</a>
+                            <li class="navitem">
+                                <a href="../build/" class="nav-link">Build</a>
                             </li>
-                            <li >
-                                <a href="../cobra/">Cobra</a>
+                            <li class="navitem">
+                                <a href="../cobra/" class="nav-link">Cobra</a>
                             </li>
-                            <li >
-                                <a href="../design/">Design</a>
+                            <li class="navitem">
+                                <a href="../design/" class="nav-link">Design</a>
                             </li>
-                            <li >
-                                <a href="../usage/">Examples</a>
+                            <li class="navitem">
+                                <a href="../usage/" class="nav-link">Examples</a>
                             </li>
-                            <li >
-                                <a href="../ws/">Ws</a>
+                            <li class="navitem">
+                                <a href="../ws/" class="nav-link">Ws</a>
                             </li>
                         </ul>
 
-                    <ul class="nav navbar-nav navbar-right">
-                        <li>
-                            <a href="#" data-toggle="modal" data-target="#mkdocs_search_modal">
+                    <ul class="nav navbar-nav ml-auto">
+                        <li class="nav-item">
+                            <a href="#" class="nav-link" data-toggle="modal" data-target="#mkdocs_search_modal">
                                 <i class="fa fa-search"></i> Search
                             </a>
                         </li>
-                            <li >
-                                <a rel="next" href="..">
+                            <li class="nav-item">
+                                <a rel="prev" href=".." class="nav-link">
                                     <i class="fa fa-arrow-left"></i> Previous
                                 </a>
                             </li>
-                            <li >
-                                <a rel="prev" href="../build/">
+                            <li class="nav-item">
+                                <a rel="next" href="../build/" class="nav-link">
                                     Next <i class="fa fa-arrow-right"></i>
                                 </a>
                             </li>
@@ -91,110 +78,445 @@
         </div>
 
         <div class="container">
-                <div class="col-md-3"><div class="bs-sidebar hidden-print affix well" role="complementary">
-    <ul class="nav bs-sidenav">
-        <li class="main active"><a href="#changelog">Changelog</a></li>
-            <li><a href="#807-2020-02-12">[8.0.7] - 2020-02-12</a></li>
-            <li><a href="#806-2020-01-31">[8.0.6] - 2020-01-31</a></li>
-            <li><a href="#805-2020-01-31">[8.0.5] - 2020-01-31</a></li>
-            <li><a href="#804-2020-01-31">[8.0.4] - 2020-01-31</a></li>
-            <li><a href="#803-2020-01-30">[8.0.3] - 2020-01-30</a></li>
-            <li><a href="#802-2020-01-28">[8.0.2] - 2020-01-28</a></li>
-            <li><a href="#801-2020-01-28">[8.0.1] - 2020-01-28</a></li>
-            <li><a href="#800-2020-01-26">[8.0.0] - 2020-01-26</a></li>
-            <li><a href="#796-2020-01-22">[7.9.6] - 2020-01-22</a></li>
-            <li><a href="#795-2020-01-14">[7.9.5] - 2020-01-14</a></li>
-            <li><a href="#794-2020-01-12">[7.9.4] - 2020-01-12</a></li>
-            <li><a href="#793-2020-01-10">[7.9.3] - 2020-01-10</a></li>
-            <li><a href="#792-2020-01-06">[7.9.2] - 2020-01-06</a></li>
-            <li><a href="#791-2020-01-06">[7.9.1] - 2020-01-06</a></li>
-            <li><a href="#790-2020-01-04">[7.9.0] - 2020-01-04</a></li>
-            <li><a href="#789-2020-01-04">[7.8.9] - 2020-01-04</a></li>
-            <li><a href="#788-2019-12-28">[7.8.8] - 2019-12-28</a></li>
-            <li><a href="#786-2019-12-28">[7.8.6] - 2019-12-28</a></li>
-            <li><a href="#785-2019-12-28">[7.8.5] - 2019-12-28</a></li>
-            <li><a href="#784-2019-12-27">[7.8.4] - 2019-12-27</a></li>
-            <li><a href="#783-2019-12-27">[7.8.3] - 2019-12-27</a></li>
-            <li><a href="#782-2019-12-25">[7.8.2] - 2019-12-25</a></li>
-            <li><a href="#781-2019-12-25">[7.8.1] - 2019-12-25</a></li>
-            <li><a href="#780-2019-12-24">[7.8.0] - 2019-12-24</a></li>
-            <li><a href="#765-2019-12-24">[7.6.5] - 2019-12-24</a></li>
-            <li><a href="#764-2019-12-22">[7.6.4] - 2019-12-22</a></li>
-            <li><a href="#763-2019-12-20">[7.6.3] - 2019-12-20</a></li>
-            <li><a href="#762-2019-12-20">[7.6.2] - 2019-12-20</a></li>
-            <li><a href="#761-2019-12-20">[7.6.1] - 2019-12-20</a></li>
-            <li><a href="#760-2019-12-19">[7.6.0] - 2019-12-19</a></li>
-            <li><a href="#758-2019-12-18">[7.5.8] - 2019-12-18</a></li>
-            <li><a href="#757-2019-12-18">[7.5.7] - 2019-12-18</a></li>
-            <li><a href="#756-2019-12-18">[7.5.6] - 2019-12-18</a></li>
-            <li><a href="#755-2019-12-17">[7.5.5] - 2019-12-17</a></li>
-            <li><a href="#754-2019-12-16">[7.5.4] - 2019-12-16</a></li>
-            <li><a href="#753-2019-12-12">[7.5.3] - 2019-12-12</a></li>
-            <li><a href="#752-2019-12-11">[7.5.2] - 2019-12-11</a></li>
-            <li><a href="#751-2019-12-06">[7.5.1] - 2019-12-06</a></li>
-            <li><a href="#750-2019-12-05">[7.5.0] - 2019-12-05</a></li>
-            <li><a href="#745-2019-12-03">[7.4.5] - 2019-12-03</a></li>
-            <li><a href="#744-2019-12-03">[7.4.4] - 2019-12-03</a></li>
-            <li><a href="#743-2019-12-03">[7.4.3] - 2019-12-03</a></li>
-            <li><a href="#742-2019-12-02">[7.4.2] - 2019-12-02</a></li>
-            <li><a href="#741-2019-12-02">[7.4.1] - 2019-12-02</a></li>
-            <li><a href="#740-2019-11-25">[7.4.0] - 2019-11-25</a></li>
-            <li><a href="#735-2019-11-20">[7.3.5] - 2019-11-20</a></li>
-            <li><a href="#734-2019-11-20">[7.3.4] - 2019-11-20</a></li>
-            <li><a href="#731-2019-11-16">[7.3.1] - 2019-11-16</a></li>
-            <li><a href="#730-2019-11-15">[7.3.0] - 2019-11-15</a></li>
-            <li><a href="#722-2019-11-01">[7.2.2] - 2019-11-01</a></li>
-            <li><a href="#721-2019-10-26">[7.2.1] - 2019-10-26</a></li>
-            <li><a href="#720-2019-10-24">[7.2.0] - 2019-10-24</a></li>
-            <li><a href="#710-2019-10-13">[7.1.0] - 2019-10-13</a></li>
-            <li><a href="#700-2019-10-01">[7.0.0] - 2019-10-01</a></li>
-            <li><a href="#634-2019-09-30">[6.3.4] - 2019-09-30</a></li>
-            <li><a href="#633-2019-09-30">[6.3.3] - 2019-09-30</a></li>
-            <li><a href="#632-2019-09-29">[6.3.2] - 2019-09-29</a></li>
-            <li><a href="#631-2019-09-29">[6.3.1] - 2019-09-29</a></li>
-            <li><a href="#630-2019-09-28">[6.3.0] - 2019-09-28</a></li>
-            <li><a href="#629-2019-09-27">[6.2.9] - 2019-09-27</a></li>
-            <li><a href="#628-2019-09-26">[6.2.8] - 2019-09-26</a></li>
-            <li><a href="#627-2019-09-25">[6.2.7] - 2019-09-25</a></li>
-            <li><a href="#626-2019-09-24">[6.2.6] - 2019-09-24</a></li>
-            <li><a href="#625-2019-09-23">[6.2.5] - 2019-09-23</a></li>
-            <li><a href="#624-2019-09-22">[6.2.4] - 2019-09-22</a></li>
-            <li><a href="#623-2019-09-21">[6.2.3] - 2019-09-21</a></li>
-            <li><a href="#622-2019-09-19">[6.2.2] - 2019-09-19</a></li>
-            <li><a href="#621-2019-09-17">[6.2.1] - 2019-09-17</a></li>
-            <li><a href="#620-2019-09-09">[6.2.0] - 2019-09-09</a></li>
-            <li><a href="#610-2019-09-08">[6.1.0] - 2019-09-08</a></li>
-            <li><a href="#601-2019-09-05">[6.0.1] - 2019-09-05</a></li>
-            <li><a href="#600-2019-09-04">[6.0.0] - 2019-09-04</a></li>
-            <li><a href="#520-2019-09-04">[5.2.0] - 2019-09-04</a></li>
-            <li><a href="#519-2019-09-03">[5.1.9] - 2019-09-03</a></li>
-            <li><a href="#518-2019-09-03">[5.1.8] - 2019-09-03</a></li>
-            <li><a href="#517-2019-09-03">[5.1.7] - 2019-09-03</a></li>
-            <li><a href="#516-2019-09-03">[5.1.6] - 2019-09-03</a></li>
-            <li><a href="#515-2019-09-03">[5.1.5] - 2019-09-03</a></li>
-            <li><a href="#514-2019-09-03">[5.1.4] - 2019-09-03</a></li>
-            <li><a href="#513-2019-09-03">[5.1.3] - 2019-09-03</a></li>
-            <li><a href="#512-2019-09-02">[5.1.2] - 2019-09-02</a></li>
-            <li><a href="#511-2019-09-01">[5.1.1] - 2019-09-01</a></li>
-            <li><a href="#510-2019-08-31">[5.1.0] - 2019-08-31</a></li>
-            <li><a href="#509-2019-08-30">[5.0.9] - 2019-08-30</a></li>
-            <li><a href="#507-2019-08-23">[5.0.7] - 2019-08-23</a></li>
-            <li><a href="#506-2019-08-22">[5.0.6] - 2019-08-22</a></li>
-            <li><a href="#505-2019-08-22">[5.0.5] - 2019-08-22</a></li>
-            <li><a href="#504-2019-08-20">[5.0.4] - 2019-08-20</a></li>
-            <li><a href="#503-2019-08-14">[5.0.3] - 2019-08-14</a></li>
-            <li><a href="#502-2019-08-01">[5.0.2] - 2019-08-01</a></li>
-            <li><a href="#501-2019-07-25">[5.0.1] - 2019-07-25</a></li>
-            <li><a href="#500-2019-06-23">[5.0.0] - 2019-06-23</a></li>
-            <li><a href="#400-2019-06-09">[4.0.0] - 2019-06-09</a></li>
-            <li><a href="#312-2019-06-06">[3.1.2] - 2019-06-06</a></li>
-            <li><a href="#300-2019-06-xx">[3.0.0] - 2019-06-xx</a></li>
-    </ul>
+            <div class="row">
+                    <div class="col-md-3"><div class="navbar-light navbar-expand-md bs-sidebar hidden-print affix" role="complementary">
+    <div class="navbar-header">
+        <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#toc-collapse" title="Table of Contents">
+            <span class="fa fa-angle-down"></span>
+        </button>
+    </div>
+
+    
+    <div id="toc-collapse" class="navbar-collapse collapse card bg-secondary">
+        <ul class="nav flex-column">
+            
+            <li class="nav-item" data-level="1"><a href="#changelog" class="nav-link">Changelog</a>
+              <ul class="nav flex-column">
+            <li class="nav-item" data-level="2"><a href="#815-2020-02-23" class="nav-link">[8.1.5] - 2020-02-23</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#814-2020-02-22" class="nav-link">[8.1.4] - 2020-02-22</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#813-2020-02-21" class="nav-link">[8.1.3] - 2020-02-21</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#812-2020-02-18" class="nav-link">[8.1.2] - 2020-02-18</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#811-2020-02-18" class="nav-link">[8.1.1] - 2020-02-18</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#810-2020-02-13" class="nav-link">[8.1.0] - 2020-02-13</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#807-2020-02-12" class="nav-link">[8.0.7] - 2020-02-12</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#806-2020-01-31" class="nav-link">[8.0.6] - 2020-01-31</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#805-2020-01-31" class="nav-link">[8.0.5] - 2020-01-31</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#804-2020-01-31" class="nav-link">[8.0.4] - 2020-01-31</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#803-2020-01-30" class="nav-link">[8.0.3] - 2020-01-30</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#802-2020-01-28" class="nav-link">[8.0.2] - 2020-01-28</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#801-2020-01-28" class="nav-link">[8.0.1] - 2020-01-28</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#800-2020-01-26" class="nav-link">[8.0.0] - 2020-01-26</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#796-2020-01-22" class="nav-link">[7.9.6] - 2020-01-22</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#795-2020-01-14" class="nav-link">[7.9.5] - 2020-01-14</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#794-2020-01-12" class="nav-link">[7.9.4] - 2020-01-12</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#793-2020-01-10" class="nav-link">[7.9.3] - 2020-01-10</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#792-2020-01-06" class="nav-link">[7.9.2] - 2020-01-06</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#791-2020-01-06" class="nav-link">[7.9.1] - 2020-01-06</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#790-2020-01-04" class="nav-link">[7.9.0] - 2020-01-04</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#789-2020-01-04" class="nav-link">[7.8.9] - 2020-01-04</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#788-2019-12-28" class="nav-link">[7.8.8] - 2019-12-28</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#786-2019-12-28" class="nav-link">[7.8.6] - 2019-12-28</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#785-2019-12-28" class="nav-link">[7.8.5] - 2019-12-28</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#784-2019-12-27" class="nav-link">[7.8.4] - 2019-12-27</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#783-2019-12-27" class="nav-link">[7.8.3] - 2019-12-27</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#782-2019-12-25" class="nav-link">[7.8.2] - 2019-12-25</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#781-2019-12-25" class="nav-link">[7.8.1] - 2019-12-25</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#780-2019-12-24" class="nav-link">[7.8.0] - 2019-12-24</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#765-2019-12-24" class="nav-link">[7.6.5] - 2019-12-24</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#764-2019-12-22" class="nav-link">[7.6.4] - 2019-12-22</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#763-2019-12-20" class="nav-link">[7.6.3] - 2019-12-20</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#762-2019-12-20" class="nav-link">[7.6.2] - 2019-12-20</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#761-2019-12-20" class="nav-link">[7.6.1] - 2019-12-20</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#760-2019-12-19" class="nav-link">[7.6.0] - 2019-12-19</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#758-2019-12-18" class="nav-link">[7.5.8] - 2019-12-18</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#757-2019-12-18" class="nav-link">[7.5.7] - 2019-12-18</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#756-2019-12-18" class="nav-link">[7.5.6] - 2019-12-18</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#755-2019-12-17" class="nav-link">[7.5.5] - 2019-12-17</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#754-2019-12-16" class="nav-link">[7.5.4] - 2019-12-16</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#753-2019-12-12" class="nav-link">[7.5.3] - 2019-12-12</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#752-2019-12-11" class="nav-link">[7.5.2] - 2019-12-11</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#751-2019-12-06" class="nav-link">[7.5.1] - 2019-12-06</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#750-2019-12-05" class="nav-link">[7.5.0] - 2019-12-05</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#745-2019-12-03" class="nav-link">[7.4.5] - 2019-12-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#744-2019-12-03" class="nav-link">[7.4.4] - 2019-12-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#743-2019-12-03" class="nav-link">[7.4.3] - 2019-12-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#742-2019-12-02" class="nav-link">[7.4.2] - 2019-12-02</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#741-2019-12-02" class="nav-link">[7.4.1] - 2019-12-02</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#740-2019-11-25" class="nav-link">[7.4.0] - 2019-11-25</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#735-2019-11-20" class="nav-link">[7.3.5] - 2019-11-20</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#734-2019-11-20" class="nav-link">[7.3.4] - 2019-11-20</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#731-2019-11-16" class="nav-link">[7.3.1] - 2019-11-16</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#730-2019-11-15" class="nav-link">[7.3.0] - 2019-11-15</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#722-2019-11-01" class="nav-link">[7.2.2] - 2019-11-01</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#721-2019-10-26" class="nav-link">[7.2.1] - 2019-10-26</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#720-2019-10-24" class="nav-link">[7.2.0] - 2019-10-24</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#710-2019-10-13" class="nav-link">[7.1.0] - 2019-10-13</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#700-2019-10-01" class="nav-link">[7.0.0] - 2019-10-01</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#634-2019-09-30" class="nav-link">[6.3.4] - 2019-09-30</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#633-2019-09-30" class="nav-link">[6.3.3] - 2019-09-30</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#632-2019-09-29" class="nav-link">[6.3.2] - 2019-09-29</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#631-2019-09-29" class="nav-link">[6.3.1] - 2019-09-29</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#630-2019-09-28" class="nav-link">[6.3.0] - 2019-09-28</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#629-2019-09-27" class="nav-link">[6.2.9] - 2019-09-27</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#628-2019-09-26" class="nav-link">[6.2.8] - 2019-09-26</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#627-2019-09-25" class="nav-link">[6.2.7] - 2019-09-25</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#626-2019-09-24" class="nav-link">[6.2.6] - 2019-09-24</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#625-2019-09-23" class="nav-link">[6.2.5] - 2019-09-23</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#624-2019-09-22" class="nav-link">[6.2.4] - 2019-09-22</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#623-2019-09-21" class="nav-link">[6.2.3] - 2019-09-21</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#622-2019-09-19" class="nav-link">[6.2.2] - 2019-09-19</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#621-2019-09-17" class="nav-link">[6.2.1] - 2019-09-17</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#620-2019-09-09" class="nav-link">[6.2.0] - 2019-09-09</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#610-2019-09-08" class="nav-link">[6.1.0] - 2019-09-08</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#601-2019-09-05" class="nav-link">[6.0.1] - 2019-09-05</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#600-2019-09-04" class="nav-link">[6.0.0] - 2019-09-04</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#520-2019-09-04" class="nav-link">[5.2.0] - 2019-09-04</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#519-2019-09-03" class="nav-link">[5.1.9] - 2019-09-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#518-2019-09-03" class="nav-link">[5.1.8] - 2019-09-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#517-2019-09-03" class="nav-link">[5.1.7] - 2019-09-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#516-2019-09-03" class="nav-link">[5.1.6] - 2019-09-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#515-2019-09-03" class="nav-link">[5.1.5] - 2019-09-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#514-2019-09-03" class="nav-link">[5.1.4] - 2019-09-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#513-2019-09-03" class="nav-link">[5.1.3] - 2019-09-03</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#512-2019-09-02" class="nav-link">[5.1.2] - 2019-09-02</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#511-2019-09-01" class="nav-link">[5.1.1] - 2019-09-01</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#510-2019-08-31" class="nav-link">[5.1.0] - 2019-08-31</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#509-2019-08-30" class="nav-link">[5.0.9] - 2019-08-30</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#507-2019-08-23" class="nav-link">[5.0.7] - 2019-08-23</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#506-2019-08-22" class="nav-link">[5.0.6] - 2019-08-22</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#505-2019-08-22" class="nav-link">[5.0.5] - 2019-08-22</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#504-2019-08-20" class="nav-link">[5.0.4] - 2019-08-20</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#503-2019-08-14" class="nav-link">[5.0.3] - 2019-08-14</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#502-2019-08-01" class="nav-link">[5.0.2] - 2019-08-01</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#501-2019-07-25" class="nav-link">[5.0.1] - 2019-07-25</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#500-2019-06-23" class="nav-link">[5.0.0] - 2019-06-23</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#400-2019-06-09" class="nav-link">[4.0.0] - 2019-06-09</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#312-2019-06-06" class="nav-link">[3.1.2] - 2019-06-06</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#300-2019-06-xx" class="nav-link">[3.0.0] - 2019-06-xx</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+              </ul>
+            </li>
+        </ul>
+    </div>
 </div></div>
-                <div class="col-md-9" role="main">
+                    <div class="col-md-9" role="main">
 
 <h1 id="changelog">Changelog</h1>
 <p>All changes to this project will be documented in this file.</p>
+<h2 id="815-2020-02-23">[8.1.5] - 2020-02-23</h2>
+<p>(server) give thread name to some usual worker threads / unittest is broken !!</p>
+<h2 id="814-2020-02-22">[8.1.4] - 2020-02-22</h2>
+<p>(websocket server) fix regression from 8.1.2, where per-deflate message compression was always disabled</p>
+<h2 id="813-2020-02-21">[8.1.3] - 2020-02-21</h2>
+<p>(client + server) Fix #155 / http header parser should treat the space(s) after the : delimiter as optional. Fixing this bug made us discover that websocket sub-protocols are not properly serialiazed, but start with a ,</p>
+<h2 id="812-2020-02-18">[8.1.2] - 2020-02-18</h2>
+<p>(WebSocketServer) add option to disable deflate compression, exposed with the -x option to ws echo_server</p>
+<h2 id="811-2020-02-18">[8.1.1] - 2020-02-18</h2>
+<p>(ws cobra to statsd and sentry sender) exit if no messages are received for one minute, which is a sign that something goes wrong on the server side. That should be changed to be configurable in the future</p>
+<h2 id="810-2020-02-13">[8.1.0] - 2020-02-13</h2>
+<p>(http client + sentry minidump upload) Multipart stream closing boundary is invalid + mark some options as mandatory in the command line tools</p>
 <h2 id="807-2020-02-12">[8.0.7] - 2020-02-12</h2>
 <p>(build) remove the unused subtree which was causing some way of installing to break</p>
 <h2 id="806-2020-01-31">[8.0.6] - 2020-01-31</h2>
@@ -579,6 +901,7 @@
 <li>Async API for HttpClient</li>
 <li>HttpClient API changed to use shared_ptr for response and request</li>
 </ul></div>
+            </div>
         </div>
 
         <footer class="col-md-12">
@@ -592,19 +915,19 @@
         <script src="../js/base.js" defer></script>
         <script src="../search/main.js" defer></script>
 
-        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="Search Modal" aria-hidden="true">
-    <div class="modal-dialog">
+        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="searchModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="searchModalLabel">Search</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Search</h4>
             </div>
             <div class="modal-body">
                 <p>
                     From here you can search these documents. Enter
                     your search terms below.
                 </p>
-                <form role="form">
+                <form>
                     <div class="form-group">
                         <input type="text" class="form-control" placeholder="Search..." id="mkdocs-search-query" title="Type search term here">
                     </div>
@@ -615,12 +938,12 @@
             </div>
         </div>
     </div>
-</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="Keyboard Shortcuts Modal" aria-hidden="true">
+</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="keyboardModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="keyboardModalLabel">Keyboard Shortcuts</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Keyboard Shortcuts</h4>
             </div>
             <div class="modal-body">
               <table class="table">
diff --git a/build/index.html b/build/index.html
index 13510cfe..7ee1e382 100644
--- a/build/index.html
+++ b/build/index.html
@@ -9,79 +9,66 @@
         
         <link rel="shortcut icon" href="../img/favicon.ico">
         <title>Build - IXWebSocket</title>
-        <link href="../css/bootstrap-custom.min.css" rel="stylesheet">
+        <link href="../css/bootstrap.min.css" rel="stylesheet">
         <link href="../css/font-awesome.min.css" rel="stylesheet">
         <link href="../css/base.css" rel="stylesheet">
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css">
-        <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
-        <!--[if lt IE 9]>
-            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
-            <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
-        <![endif]-->
 
         <script src="../js/jquery-1.10.2.min.js" defer></script>
-        <script src="../js/bootstrap-3.0.3.min.js" defer></script>
+        <script src="../js/bootstrap.min.js" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
         <script>hljs.initHighlightingOnLoad();</script> 
     </head>
 
     <body>
-
-        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+        <div class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
             <div class="container">
-
-                <!-- Collapsed navigation -->
-                <div class="navbar-header">
-                    <!-- Expander button -->
-                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-                        <span class="sr-only">Toggle navigation</span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                    </button>
-                    <a class="navbar-brand" href="..">IXWebSocket</a>
-                </div>
+                <a class="navbar-brand" href="..">IXWebSocket</a>
+                <!-- Expander button -->
+                <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbar-collapse">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
 
                 <!-- Expanded navigation -->
-                <div class="navbar-collapse collapse">
+                <div id="navbar-collapse" class="navbar-collapse collapse">
                         <!-- Main navigation -->
                         <ul class="nav navbar-nav">
-                            <li >
-                                <a href="..">Home</a>
+                            <li class="navitem">
+                                <a href=".." class="nav-link">Home</a>
                             </li>
-                            <li >
-                                <a href="../CHANGELOG/">Changelog</a>
+                            <li class="navitem">
+                                <a href="../CHANGELOG/" class="nav-link">Changelog</a>
                             </li>
-                            <li class="active">
-                                <a href="./">Build</a>
+                            <li class="navitem active">
+                                <a href="./" class="nav-link">Build</a>
                             </li>
-                            <li >
-                                <a href="../cobra/">Cobra</a>
+                            <li class="navitem">
+                                <a href="../cobra/" class="nav-link">Cobra</a>
                             </li>
-                            <li >
-                                <a href="../design/">Design</a>
+                            <li class="navitem">
+                                <a href="../design/" class="nav-link">Design</a>
                             </li>
-                            <li >
-                                <a href="../usage/">Examples</a>
+                            <li class="navitem">
+                                <a href="../usage/" class="nav-link">Examples</a>
                             </li>
-                            <li >
-                                <a href="../ws/">Ws</a>
+                            <li class="navitem">
+                                <a href="../ws/" class="nav-link">Ws</a>
                             </li>
                         </ul>
 
-                    <ul class="nav navbar-nav navbar-right">
-                        <li>
-                            <a href="#" data-toggle="modal" data-target="#mkdocs_search_modal">
+                    <ul class="nav navbar-nav ml-auto">
+                        <li class="nav-item">
+                            <a href="#" class="nav-link" data-toggle="modal" data-target="#mkdocs_search_modal">
                                 <i class="fa fa-search"></i> Search
                             </a>
                         </li>
-                            <li >
-                                <a rel="next" href="../CHANGELOG/">
+                            <li class="nav-item">
+                                <a rel="prev" href="../CHANGELOG/" class="nav-link">
                                     <i class="fa fa-arrow-left"></i> Previous
                                 </a>
                             </li>
-                            <li >
-                                <a rel="prev" href="../cobra/">
+                            <li class="nav-item">
+                                <a rel="next" href="../cobra/" class="nav-link">
                                     Next <i class="fa fa-arrow-right"></i>
                                 </a>
                             </li>
@@ -91,16 +78,26 @@
         </div>
 
         <div class="container">
-                <div class="col-md-3"><div class="bs-sidebar hidden-print affix well" role="complementary">
-    <ul class="nav bs-sidenav">
-        <li class="main active"><a href="#build">Build</a></li>
-            <li><a href="#cmake">CMake</a></li>
-            <li><a href="#vcpkg">vcpkg</a></li>
-            <li><a href="#conan">Conan</a></li>
-            <li><a href="#docker">Docker</a></li>
-    </ul>
+            <div class="row">
+                    <div class="col-md-3"><div class="navbar-light navbar-expand-md bs-sidebar hidden-print affix" role="complementary">
+    <div class="navbar-header">
+        <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#toc-collapse" title="Table of Contents">
+            <span class="fa fa-angle-down"></span>
+        </button>
+    </div>
+
+    
+    <div id="toc-collapse" class="navbar-collapse collapse card bg-secondary">
+        <ul class="nav flex-column">
+            
+            <li class="nav-item" data-level="2"><a href="#build" class="nav-link">Build</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+        </ul>
+    </div>
 </div></div>
-                <div class="col-md-9" role="main">
+                    <div class="col-md-9" role="main">
 
 <h2 id="build">Build</h2>
 <h3 id="cmake">CMake</h3>
@@ -158,6 +155,7 @@ app@ca2340eb9106:~$ ws --help
 ws is a websocket tool
 ...
 </code></pre></div>
+            </div>
         </div>
 
         <footer class="col-md-12">
@@ -171,19 +169,19 @@ ws is a websocket tool
         <script src="../js/base.js" defer></script>
         <script src="../search/main.js" defer></script>
 
-        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="Search Modal" aria-hidden="true">
-    <div class="modal-dialog">
+        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="searchModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="searchModalLabel">Search</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Search</h4>
             </div>
             <div class="modal-body">
                 <p>
                     From here you can search these documents. Enter
                     your search terms below.
                 </p>
-                <form role="form">
+                <form>
                     <div class="form-group">
                         <input type="text" class="form-control" placeholder="Search..." id="mkdocs-search-query" title="Type search term here">
                     </div>
@@ -194,12 +192,12 @@ ws is a websocket tool
             </div>
         </div>
     </div>
-</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="Keyboard Shortcuts Modal" aria-hidden="true">
+</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="keyboardModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="keyboardModalLabel">Keyboard Shortcuts</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Keyboard Shortcuts</h4>
             </div>
             <div class="modal-body">
               <table class="table">
diff --git a/cobra/index.html b/cobra/index.html
index 52ebf048..ed2c726b 100644
--- a/cobra/index.html
+++ b/cobra/index.html
@@ -9,79 +9,66 @@
         
         <link rel="shortcut icon" href="../img/favicon.ico">
         <title>Cobra - IXWebSocket</title>
-        <link href="../css/bootstrap-custom.min.css" rel="stylesheet">
+        <link href="../css/bootstrap.min.css" rel="stylesheet">
         <link href="../css/font-awesome.min.css" rel="stylesheet">
         <link href="../css/base.css" rel="stylesheet">
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css">
-        <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
-        <!--[if lt IE 9]>
-            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
-            <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
-        <![endif]-->
 
         <script src="../js/jquery-1.10.2.min.js" defer></script>
-        <script src="../js/bootstrap-3.0.3.min.js" defer></script>
+        <script src="../js/bootstrap.min.js" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
         <script>hljs.initHighlightingOnLoad();</script> 
     </head>
 
     <body>
-
-        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+        <div class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
             <div class="container">
-
-                <!-- Collapsed navigation -->
-                <div class="navbar-header">
-                    <!-- Expander button -->
-                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-                        <span class="sr-only">Toggle navigation</span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                    </button>
-                    <a class="navbar-brand" href="..">IXWebSocket</a>
-                </div>
+                <a class="navbar-brand" href="..">IXWebSocket</a>
+                <!-- Expander button -->
+                <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbar-collapse">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
 
                 <!-- Expanded navigation -->
-                <div class="navbar-collapse collapse">
+                <div id="navbar-collapse" class="navbar-collapse collapse">
                         <!-- Main navigation -->
                         <ul class="nav navbar-nav">
-                            <li >
-                                <a href="..">Home</a>
+                            <li class="navitem">
+                                <a href=".." class="nav-link">Home</a>
                             </li>
-                            <li >
-                                <a href="../CHANGELOG/">Changelog</a>
+                            <li class="navitem">
+                                <a href="../CHANGELOG/" class="nav-link">Changelog</a>
                             </li>
-                            <li >
-                                <a href="../build/">Build</a>
+                            <li class="navitem">
+                                <a href="../build/" class="nav-link">Build</a>
                             </li>
-                            <li class="active">
-                                <a href="./">Cobra</a>
+                            <li class="navitem active">
+                                <a href="./" class="nav-link">Cobra</a>
                             </li>
-                            <li >
-                                <a href="../design/">Design</a>
+                            <li class="navitem">
+                                <a href="../design/" class="nav-link">Design</a>
                             </li>
-                            <li >
-                                <a href="../usage/">Examples</a>
+                            <li class="navitem">
+                                <a href="../usage/" class="nav-link">Examples</a>
                             </li>
-                            <li >
-                                <a href="../ws/">Ws</a>
+                            <li class="navitem">
+                                <a href="../ws/" class="nav-link">Ws</a>
                             </li>
                         </ul>
 
-                    <ul class="nav navbar-nav navbar-right">
-                        <li>
-                            <a href="#" data-toggle="modal" data-target="#mkdocs_search_modal">
+                    <ul class="nav navbar-nav ml-auto">
+                        <li class="nav-item">
+                            <a href="#" class="nav-link" data-toggle="modal" data-target="#mkdocs_search_modal">
                                 <i class="fa fa-search"></i> Search
                             </a>
                         </li>
-                            <li >
-                                <a rel="next" href="../build/">
+                            <li class="nav-item">
+                                <a rel="prev" href="../build/" class="nav-link">
                                     <i class="fa fa-arrow-left"></i> Previous
                                 </a>
                             </li>
-                            <li >
-                                <a rel="prev" href="../design/">
+                            <li class="nav-item">
+                                <a rel="next" href="../design/" class="nav-link">
                                     Next <i class="fa fa-arrow-right"></i>
                                 </a>
                             </li>
@@ -91,15 +78,26 @@
         </div>
 
         <div class="container">
-                <div class="col-md-3"><div class="bs-sidebar hidden-print affix well" role="complementary">
-    <ul class="nav bs-sidenav">
-        <li class="main active"><a href="#general">General</a></li>
-            <li><a href="#server">Server</a></li>
-            <li><a href="#publisher">Publisher</a></li>
-            <li><a href="#subscriber">Subscriber</a></li>
-    </ul>
+            <div class="row">
+                    <div class="col-md-3"><div class="navbar-light navbar-expand-md bs-sidebar hidden-print affix" role="complementary">
+    <div class="navbar-header">
+        <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#toc-collapse" title="Table of Contents">
+            <span class="fa fa-angle-down"></span>
+        </button>
+    </div>
+
+    
+    <div id="toc-collapse" class="navbar-collapse collapse card bg-secondary">
+        <ul class="nav flex-column">
+            
+            <li class="nav-item" data-level="2"><a href="#general" class="nav-link">General</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+        </ul>
+    </div>
 </div></div>
-                <div class="col-md-9" role="main">
+                    <div class="col-md-9" role="main">
 
 <h2 id="general">General</h2>
 <p><a href="https://github.com/machinezone/cobra">cobra</a> is a real time messaging server. The <code>ws</code> utility can run a cobra server (named snake), and has client to publish and subscribe to a cobra server.</p>
@@ -172,6 +170,7 @@ $ ws cobra_publish --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127
 #messages 4 msg/s 1
 ^C
 </code></pre></div>
+            </div>
         </div>
 
         <footer class="col-md-12">
@@ -185,19 +184,19 @@ $ ws cobra_publish --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127
         <script src="../js/base.js" defer></script>
         <script src="../search/main.js" defer></script>
 
-        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="Search Modal" aria-hidden="true">
-    <div class="modal-dialog">
+        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="searchModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="searchModalLabel">Search</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Search</h4>
             </div>
             <div class="modal-body">
                 <p>
                     From here you can search these documents. Enter
                     your search terms below.
                 </p>
-                <form role="form">
+                <form>
                     <div class="form-group">
                         <input type="text" class="form-control" placeholder="Search..." id="mkdocs-search-query" title="Type search term here">
                     </div>
@@ -208,12 +207,12 @@ $ ws cobra_publish --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127
             </div>
         </div>
     </div>
-</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="Keyboard Shortcuts Modal" aria-hidden="true">
+</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="keyboardModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="keyboardModalLabel">Keyboard Shortcuts</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Keyboard Shortcuts</h4>
             </div>
             <div class="modal-body">
               <table class="table">
diff --git a/css/base.css b/css/base.css
index a71c186f..9fd57cb9 100644
--- a/css/base.css
+++ b/css/base.css
@@ -1,5 +1,9 @@
-body {
-    padding-top: 70px;
+html {
+    /* csslint ignore:start */
+    /* The nav header is 3.5rem high, plus 20px for the margin-top of the
+       main container. */
+    scroll-padding-top: calc(3.5rem + 20px);
+    /* csslint ignore:end */
 }
 
 /* Replacement for `body { background-attachment: fixed; }`, which has
@@ -18,20 +22,15 @@ body::before {
 }
 
 body > .container {
+    margin-top: 20px;
     min-height: 400px;
 }
 
-ul.nav .main {
-    font-weight: bold;
-}
-
-.col-md-3 {
-    padding-left: 0;
-    z-index: 1;
-}
-
-.col-md-9 {
-    padding-bottom: 100px;
+.navbar.fixed-top { /* csslint allow: adjoining-classes */
+    /* csslint ignore:start */
+    position: -webkit-sticky;
+    position: sticky;
+    /* csslint ignore:end */
 }
 
 .source-links {
@@ -49,19 +48,6 @@ ul.nav .main {
     margin: 20px auto 30px auto;
 }
 
-/*
- * The code below adds some padding to the top of the current anchor target so
- * that, when navigating to it, the header isn't hidden by the navbar at the
- * top.
- */
-:target::before {
-    content: "";
-    display: block;
-    margin-top: -75px;
-    height: 75px;
-    pointer-events: none;
-}
-
 h1 {
     color: #444;
     font-weight: 400;
@@ -99,11 +85,12 @@ code {
 }
 
 pre code {
+    display: block;
     background: transparent;
     border: none;
     white-space: pre;
     word-wrap: normal;
-    font-family: monospace,serif;
+    font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
     font-size: 12px;
 }
 
@@ -143,22 +130,45 @@ footer {
  * sections of docs content.
  */
 
-/* By default it's not affixed in mobile views, so undo that */
 .bs-sidebar.affix { /* csslint allow: adjoining-classes */
-    position: static;
+    /* csslint ignore:start */
+    position: -webkit-sticky;
+    position: sticky;
+    /* csslint ignore:end */
+    /* The nav header is 3.5rem high, plus 20px for the margin-top of the
+       main container. */
+    top: calc(3.5rem + 20px);
 }
 
-.bs-sidebar.well { /* csslint allow: adjoining-classes */
+.bs-sidebar.card { /* csslint allow: adjoining-classes */
     padding: 0;
     max-height: 90%;
     overflow-y: auto;
 }
 
+/* Toggle (vertically flip) sidebar collapse icon */
+.bs-sidebar .navbar-toggler span {
+    -moz-transform: scale(1, -1);
+    -webkit-transform: scale(1, -1);
+    -o-transform: scale(1, -1);
+    -ms-transform: scale(1, -1);
+    transform: scale(1, -1);
+}
+
+.bs-sidebar .navbar-toggler.collapsed span { /* csslint allow: adjoining-classes */
+    -moz-transform: scale(1, 1);
+    -webkit-transform: scale(1, 1);
+    -o-transform: scale(1, 1);
+    -ms-transform: scale(1, 1);
+    transform: scale(1, 1);
+}
+
 /* First level of nav */
-.bs-sidenav {
+.bs-sidebar > .navbar-collapse > .nav {
     padding-top:    10px;
     padding-bottom: 10px;
     border-radius: 5px;
+    width: 100%;
 }
 
 /* All levels of nav */
@@ -172,62 +182,24 @@ footer {
     text-decoration: none;
     border-right: 1px solid;
 }
-.bs-sidebar .nav > .active > a,
-.bs-sidebar .nav > .active:hover > a,
-.bs-sidebar .nav > .active:focus > a {
+.bs-sidebar .nav > li > a.active,
+.bs-sidebar .nav > li > a.active:hover,
+.bs-sidebar .nav > li > a.active:focus {
     font-weight: bold;
     background-color: transparent;
     border-right: 1px solid;
 }
 
-/* Nav: second level (shown on .active) */
-.bs-sidebar .nav .nav {
-    display: none; /* Hide by default, but at >768px, show it */
-    margin-bottom: 8px;
-}
-.bs-sidebar .nav .nav > li > a {
-    padding-top:    3px;
-    padding-bottom: 3px;
-    padding-left: 30px;
-    font-size: 90%;
+.bs-sidebar .nav .nav .nav {
+    margin-left: 1em;
 }
 
-/* Show and affix the side nav when space allows it */
-@media (min-width: 992px) {
-    /* Workaround a Safari bug when zooming to < 100%
-       https://github.com/mkdocs/mkdocs/issues/1050 */
-    .col-md-9 {
-        box-sizing: border-box;  /* csslint allow: box-sizing */
-        padding-left: 25%;
-        width: 100%;
-    }
-    .bs-sidebar .nav > .active > ul {
-        display: block;
-    }
-    /* Widen the fixed sidebar */
-    .bs-sidebar.affix, /* csslint allow: adjoining-classes */
-    .bs-sidebar.affix-bottom { /* csslint allow: adjoining-classes */
-        width: 213px;
-    }
-    .bs-sidebar.affix { /* csslint allow: adjoining-classes */
-        position: fixed; /* Undo the static from mobile first approach */
-        top: 80px;
-    }
-    .bs-sidebar.affix-bottom { /* csslint allow: adjoining-classes */
-        position: absolute; /* Undo the static from mobile first approach */
-    }
-    .bs-sidebar.affix-bottom .bs-sidenav, /* csslint allow: adjoining-classes */
-    .bs-sidebar.affix .bs-sidenav { /* csslint allow: adjoining-classes */
-        margin-top: 0;
-        margin-bottom: 0;
-    }
+.bs-sidebar .nav > li > a {
+    font-weight: bold;
 }
-@media (min-width: 1200px) {
-    /* Widen the fixed sidebar again */
-    .bs-sidebar.affix-bottom, /* csslint allow: adjoining-classes */
-    .bs-sidebar.affix { /* csslint allow: adjoining-classes */
-        width: 263px;
-    }
+
+.bs-sidebar .nav .nav > li > a {
+    font-weight: normal;
 }
 
 .headerlink {
@@ -274,26 +246,25 @@ h1:hover .headerlink, h2:hover .headerlink, h3:hover .headerlink, h4:hover .head
     text-align: left;
 }
 
-
-.dropdown-submenu {
-    position: relative;
+@media (max-width: 991.98px) {
+    .navbar-collapse.show { /* csslint allow: adjoining-classes */
+        overflow-y: auto;
+        max-height: calc(100vh - 3.5rem);
+    }
 }
 
-.dropdown-submenu>.dropdown-menu {
-    top: 0;
-    left: 100%;
-    margin-top: -6px;
-    margin-left: -1px;
-    -webkit-border-radius: 0 6px 6px 6px;
-    -moz-border-radius: 0 6px 6px;
-    border-radius: 0 6px 6px 6px;
+.dropdown-item.open { /* csslint allow: adjoining-classes */
+    color: #fff;
+    background-color: #2FA4E7;
 }
 
-.dropdown-submenu:hover>.dropdown-menu {
-    display: block;
+.dropdown-submenu > .dropdown-menu {
+    margin: 0 0 0 1.5rem;
+    padding: 0;
+    border-width: 0;
 }
 
-.dropdown-submenu>a:after {
+.dropdown-submenu > a::after {
     display: block;
     content: " ";
     float: right;
@@ -307,18 +278,36 @@ h1:hover .headerlink, h2:hover .headerlink, h3:hover .headerlink, h4:hover .head
     margin-right: -10px;
 }
 
-.dropdown-submenu:hover>a:after {
+.dropdown-submenu:hover > a::after {
     border-left-color: #fff;
 }
 
-.dropdown-submenu.pull-left { /* csslint allow: adjoining-classes */
-    float: none;
-}
+@media (min-width: 992px) {
+    .dropdown-menu {
+        overflow-y: auto;
+        max-height: calc(100vh - 3.5rem);
+    }
 
-.dropdown-submenu.pull-left>.dropdown-menu { /* csslint allow: adjoining-classes */
-    left: -100%;
-    margin-left: 10px;
-    -webkit-border-radius: 6px 0 6px 6px;
-    -moz-border-radius: 6px 0 6px 6px;
-    border-radius: 6px 0 6px 6px;
+    .dropdown-submenu {
+        position: relative;
+    }
+
+    .dropdown-submenu > .dropdown-menu {
+        /* csslint ignore:start */
+        position: fixed !important;
+        /* csslint ignore:end */
+        margin-top: -9px;
+        margin-left: -2px;
+        border-width: 1px;
+        padding: 0.5rem 0;
+    }
+
+    .dropdown-submenu.pull-left { /* csslint allow: adjoining-classes */
+        float: none;
+    }
+
+    .dropdown-submenu.pull-left > .dropdown-menu { /* csslint allow: adjoining-classes */
+        left: -100%;
+        margin-left: 10px;
+    }
 }
diff --git a/css/bootstrap-custom.min.css b/css/bootstrap-custom.min.css
deleted file mode 100644
index d85b1dcd..00000000
--- a/css/bootstrap-custom.min.css
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file
diff --git a/css/bootstrap.min.css b/css/bootstrap.min.css
new file mode 100644
index 00000000..4ce503d7
--- /dev/null
+++ b/css/bootstrap.min.css
@@ -0,0 +1,12 @@
+/*!
+ * Bootswatch v4.1.3
+ * Homepage: https://bootswatch.com
+ * Copyright 2012-2018 Thomas Park
+ * Licensed under MIT
+ * Based on Bootstrap
+*//*!
+ * Bootstrap v4.1.3 (https://getbootstrap.com/)
+ * Copyright 2011-2018 The Bootstrap Authors
+ * Copyright 2011-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */:root{--blue:#033C73;--indigo:#6610f2;--purple:#6f42c1;--pink:#e83e8c;--red:#C71C22;--orange:#fd7e14;--yellow:#DD5600;--green:#73A839;--teal:#20c997;--cyan:#2FA4E7;--white:#fff;--gray:#868e96;--gray-dark:#343a40;--primary:#2FA4E7;--secondary:#e9ecef;--success:#73A839;--info:#033C73;--warning:#DD5600;--danger:#C71C22;--light:#f8f9fa;--dark:#343a40;--breakpoint-xs:0;--breakpoint-sm:576px;--breakpoint-md:768px;--breakpoint-lg:992px;--breakpoint-xl:1200px;--font-family-sans-serif:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-family-monospace:SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", 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.page-link{border-top-right-radius:0.3rem;border-bottom-right-radius:0.3rem}.pagination-sm .page-link{padding:0.25rem 0.5rem;font-size:0.875rem;line-height:1.5}.pagination-sm .page-item:first-child .page-link{border-top-left-radius:0.2rem;border-bottom-left-radius:0.2rem}.pagination-sm .page-item:last-child .page-link{border-top-right-radius:0.2rem;border-bottom-right-radius:0.2rem}.badge{display:inline-block;padding:0.25em 0.4em;font-size:75%;font-weight:700;line-height:1;text-align:center;white-space:nowrap;vertical-align:baseline;border-radius:0.25rem}.badge:empty{display:none}.btn .badge{position:relative;top:-1px}.badge-pill{padding-right:0.6em;padding-left:0.6em;border-radius:10rem}.badge-primary{color:#fff;background-color:#2FA4E7}.badge-primary[href]:hover,.badge-primary[href]:focus{color:#fff;text-decoration:none;background-color:#178acc}.badge-secondary{color:#212529;background-color:#e9ecef}.badge-secondary[href]:hover,.badge-secondary[href]:focus{color:#212529;text-decoration:none;background-color:#cbd3da}.badge-success{color:#fff;background-color:#73A839}.badge-success[href]:hover,.badge-success[href]:focus{color:#fff;text-decoration:none;background-color:#59822c}.badge-info{color:#fff;background-color:#033C73}.badge-info[href]:hover,.badge-info[href]:focus{color:#fff;text-decoration:none;background-color:#022241}.badge-warning{color:#fff;background-color:#DD5600}.badge-warning[href]:hover,.badge-warning[href]:focus{color:#fff;text-decoration:none;background-color:#aa4200}.badge-danger{color:#fff;background-color:#C71C22}.badge-danger[href]:hover,.badge-danger[href]:focus{color:#fff;text-decoration:none;background-color:#9a161a}.badge-light{color:#212529;background-color:#f8f9fa}.badge-light[href]:hover,.badge-light[href]:focus{color:#212529;text-decoration:none;background-color:#dae0e5}.badge-dark{color:#fff;background-color:#343a40}.badge-dark[href]:hover,.badge-dark[href]:focus{color:#fff;text-decoration:none;background-color:#1d2124}.jumbotron{padding:2rem 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!important}.table-dark{color:inherit}.table-dark th,.table-dark td,.table-dark thead th,.table-dark tbody+tbody{border-color:#dee2e6}.table .thead-dark th{color:inherit;border-color:#dee2e6}}.bg-primary{background-image:-webkit-gradient(linear, left top, left bottom, from(#54b4eb), color-stop(60%, #2FA4E7), to(#1d9ce5));background-image:linear-gradient(#54b4eb, #2FA4E7 60%, #1d9ce5);background-repeat:no-repeat}.bg-dark{background-image:-webkit-gradient(linear, left top, left bottom, from(#04519b), color-stop(60%, #033C73), to(#02325f));background-image:linear-gradient(#04519b, #033C73 60%, #02325f);background-repeat:no-repeat}.bg-light{background-image:-webkit-gradient(linear, left top, left bottom, from(white), color-stop(60%, #e9ecef), to(#e3e7eb));background-image:linear-gradient(white, #e9ecef 60%, #e3e7eb);background-repeat:no-repeat}.navbar-brand,.nav-link{text-shadow:0 1px 0 rgba(0,0,0,0.05)}.btn{text-shadow:0 1px 0 rgba(0,0,0,0.05)}.btn-primary{background-image:-webkit-gradient(linear, left top, left bottom, from(#54b4eb), color-stop(60%, #2FA4E7), to(#1d9ce5));background-image:linear-gradient(#54b4eb, #2FA4E7 60%, #1d9ce5);background-repeat:no-repeat}.btn-secondary{background-image:-webkit-gradient(linear, left top, left bottom, from(white), color-stop(60%, #e9ecef), to(#dde2e6));background-image:linear-gradient(white, #e9ecef 60%, #dde2e6);background-repeat:no-repeat;color:#495057}.btn-success{background-image:-webkit-gradient(linear, left top, left bottom, from(#88c149), color-stop(60%, #73A839), to(#699934));background-image:linear-gradient(#88c149, #73A839 60%, #699934);background-repeat:no-repeat}.btn-info{background-image:-webkit-gradient(linear, left top, left bottom, from(#04519b), color-stop(60%, #033C73), to(#02325f));background-image:linear-gradient(#04519b, #033C73 60%, #02325f);background-repeat:no-repeat}.btn-warning{background-image:-webkit-gradient(linear, left top, left bottom, from(#ff6707), color-stop(60%, #DD5600), to(#c94e00));background-image:linear-gradient(#ff6707, #DD5600 60%, #c94e00);background-repeat:no-repeat}.btn-danger{background-image:-webkit-gradient(linear, left top, left bottom, from(#e12b31), color-stop(60%, #C71C22), to(#b5191f));background-image:linear-gradient(#e12b31, #C71C22 60%, #b5191f);background-repeat:no-repeat}.btn-light{background-image:-webkit-gradient(linear, left top, left bottom, from(white), color-stop(60%, #f8f9fa), to(#eceff2));background-image:linear-gradient(white, #f8f9fa 60%, #eceff2);background-repeat:no-repeat}.btn-dark{background-image:-webkit-gradient(linear, left top, left bottom, from(#464e57), color-stop(60%, #343a40), to(#2b3035));background-image:linear-gradient(#464e57, #343a40 60%, #2b3035);background-repeat:no-repeat}.bg-primary h1,.bg-primary h2,.bg-primary h3,.bg-primary h4,.bg-primary h5,.bg-primary h6,.bg-success h1,.bg-success h2,.bg-success h3,.bg-success h4,.bg-success h5,.bg-success h6,.bg-info h1,.bg-info h2,.bg-info h3,.bg-info h4,.bg-info h5,.bg-info h6,.bg-warning h1,.bg-warning h2,.bg-warning h3,.bg-warning h4,.bg-warning h5,.bg-warning h6,.bg-danger h1,.bg-danger h2,.bg-danger h3,.bg-danger h4,.bg-danger h5,.bg-danger h6,.bg-dark h1,.bg-dark h2,.bg-dark h3,.bg-dark h4,.bg-dark h5,.bg-dark h6{color:#fff}.dropdown-menu .dropdown-header{color:#868e96}
diff --git a/design/index.html b/design/index.html
index 15b47004..89064b36 100644
--- a/design/index.html
+++ b/design/index.html
@@ -9,79 +9,66 @@
         
         <link rel="shortcut icon" href="../img/favicon.ico">
         <title>Design - IXWebSocket</title>
-        <link href="../css/bootstrap-custom.min.css" rel="stylesheet">
+        <link href="../css/bootstrap.min.css" rel="stylesheet">
         <link href="../css/font-awesome.min.css" rel="stylesheet">
         <link href="../css/base.css" rel="stylesheet">
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css">
-        <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
-        <!--[if lt IE 9]>
-            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
-            <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
-        <![endif]-->
 
         <script src="../js/jquery-1.10.2.min.js" defer></script>
-        <script src="../js/bootstrap-3.0.3.min.js" defer></script>
+        <script src="../js/bootstrap.min.js" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
         <script>hljs.initHighlightingOnLoad();</script> 
     </head>
 
     <body>
-
-        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+        <div class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
             <div class="container">
-
-                <!-- Collapsed navigation -->
-                <div class="navbar-header">
-                    <!-- Expander button -->
-                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-                        <span class="sr-only">Toggle navigation</span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                    </button>
-                    <a class="navbar-brand" href="..">IXWebSocket</a>
-                </div>
+                <a class="navbar-brand" href="..">IXWebSocket</a>
+                <!-- Expander button -->
+                <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbar-collapse">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
 
                 <!-- Expanded navigation -->
-                <div class="navbar-collapse collapse">
+                <div id="navbar-collapse" class="navbar-collapse collapse">
                         <!-- Main navigation -->
                         <ul class="nav navbar-nav">
-                            <li >
-                                <a href="..">Home</a>
+                            <li class="navitem">
+                                <a href=".." class="nav-link">Home</a>
                             </li>
-                            <li >
-                                <a href="../CHANGELOG/">Changelog</a>
+                            <li class="navitem">
+                                <a href="../CHANGELOG/" class="nav-link">Changelog</a>
                             </li>
-                            <li >
-                                <a href="../build/">Build</a>
+                            <li class="navitem">
+                                <a href="../build/" class="nav-link">Build</a>
                             </li>
-                            <li >
-                                <a href="../cobra/">Cobra</a>
+                            <li class="navitem">
+                                <a href="../cobra/" class="nav-link">Cobra</a>
                             </li>
-                            <li class="active">
-                                <a href="./">Design</a>
+                            <li class="navitem active">
+                                <a href="./" class="nav-link">Design</a>
                             </li>
-                            <li >
-                                <a href="../usage/">Examples</a>
+                            <li class="navitem">
+                                <a href="../usage/" class="nav-link">Examples</a>
                             </li>
-                            <li >
-                                <a href="../ws/">Ws</a>
+                            <li class="navitem">
+                                <a href="../ws/" class="nav-link">Ws</a>
                             </li>
                         </ul>
 
-                    <ul class="nav navbar-nav navbar-right">
-                        <li>
-                            <a href="#" data-toggle="modal" data-target="#mkdocs_search_modal">
+                    <ul class="nav navbar-nav ml-auto">
+                        <li class="nav-item">
+                            <a href="#" class="nav-link" data-toggle="modal" data-target="#mkdocs_search_modal">
                                 <i class="fa fa-search"></i> Search
                             </a>
                         </li>
-                            <li >
-                                <a rel="next" href="../cobra/">
+                            <li class="nav-item">
+                                <a rel="prev" href="../cobra/" class="nav-link">
                                     <i class="fa fa-arrow-left"></i> Previous
                                 </a>
                             </li>
-                            <li >
-                                <a rel="prev" href="../usage/">
+                            <li class="nav-item">
+                                <a rel="next" href="../usage/" class="nav-link">
                                     Next <i class="fa fa-arrow-right"></i>
                                 </a>
                             </li>
@@ -91,20 +78,36 @@
         </div>
 
         <div class="container">
-                <div class="col-md-3"><div class="bs-sidebar hidden-print affix well" role="complementary">
-    <ul class="nav bs-sidenav">
-        <li class="main active"><a href="#implementation-details">Implementation details</a></li>
-            <li><a href="#per-message-deflate-compression">Per Message Deflate compression.</a></li>
-            <li><a href="#tlsssl">TLS/SSL</a></li>
-            <li><a href="#polling-and-background-thread-work">Polling and background thread work</a></li>
-            <li><a href="#automatic-reconnection">Automatic reconnection</a></li>
-            <li><a href="#large-messages">Large messages</a></li>
-            <li><a href="#testing">Testing</a></li>
-        <li class="main "><a href="#limitations">Limitations</a></li>
-        <li class="main "><a href="#c-code-organization">C++ code organization</a></li>
-    </ul>
+            <div class="row">
+                    <div class="col-md-3"><div class="navbar-light navbar-expand-md bs-sidebar hidden-print affix" role="complementary">
+    <div class="navbar-header">
+        <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#toc-collapse" title="Table of Contents">
+            <span class="fa fa-angle-down"></span>
+        </button>
+    </div>
+
+    
+    <div id="toc-collapse" class="navbar-collapse collapse card bg-secondary">
+        <ul class="nav flex-column">
+            
+            <li class="nav-item" data-level="2"><a href="#implementation-details" class="nav-link">Implementation details</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#limitations" class="nav-link">Limitations</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#c-code-organization" class="nav-link">C++ code organization</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+        </ul>
+    </div>
 </div></div>
-                <div class="col-md-9" role="main">
+                    <div class="col-md-9" role="main">
 
 <h2 id="implementation-details">Implementation details</h2>
 <h3 id="per-message-deflate-compression">Per Message Deflate compression.</h3>
@@ -163,6 +166,7 @@
 |                       |
 +-----------------------+
 </code></pre></div>
+            </div>
         </div>
 
         <footer class="col-md-12">
@@ -176,19 +180,19 @@
         <script src="../js/base.js" defer></script>
         <script src="../search/main.js" defer></script>
 
-        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="Search Modal" aria-hidden="true">
-    <div class="modal-dialog">
+        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="searchModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="searchModalLabel">Search</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Search</h4>
             </div>
             <div class="modal-body">
                 <p>
                     From here you can search these documents. Enter
                     your search terms below.
                 </p>
-                <form role="form">
+                <form>
                     <div class="form-group">
                         <input type="text" class="form-control" placeholder="Search..." id="mkdocs-search-query" title="Type search term here">
                     </div>
@@ -199,12 +203,12 @@
             </div>
         </div>
     </div>
-</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="Keyboard Shortcuts Modal" aria-hidden="true">
+</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="keyboardModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="keyboardModalLabel">Keyboard Shortcuts</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Keyboard Shortcuts</h4>
             </div>
             <div class="modal-body">
               <table class="table">
diff --git a/index.html b/index.html
index fcf126bd..bf0c5259 100644
--- a/index.html
+++ b/index.html
@@ -9,79 +9,66 @@
         
         <link rel="shortcut icon" href="img/favicon.ico">
         <title>IXWebSocket</title>
-        <link href="css/bootstrap-custom.min.css" rel="stylesheet">
+        <link href="css/bootstrap.min.css" rel="stylesheet">
         <link href="css/font-awesome.min.css" rel="stylesheet">
         <link href="css/base.css" rel="stylesheet">
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css">
-        <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
-        <!--[if lt IE 9]>
-            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
-            <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
-        <![endif]-->
 
         <script src="js/jquery-1.10.2.min.js" defer></script>
-        <script src="js/bootstrap-3.0.3.min.js" defer></script>
+        <script src="js/bootstrap.min.js" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
         <script>hljs.initHighlightingOnLoad();</script> 
     </head>
 
     <body class="homepage">
-
-        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+        <div class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
             <div class="container">
-
-                <!-- Collapsed navigation -->
-                <div class="navbar-header">
-                    <!-- Expander button -->
-                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-                        <span class="sr-only">Toggle navigation</span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                    </button>
-                    <a class="navbar-brand" href=".">IXWebSocket</a>
-                </div>
+                <a class="navbar-brand" href=".">IXWebSocket</a>
+                <!-- Expander button -->
+                <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbar-collapse">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
 
                 <!-- Expanded navigation -->
-                <div class="navbar-collapse collapse">
+                <div id="navbar-collapse" class="navbar-collapse collapse">
                         <!-- Main navigation -->
                         <ul class="nav navbar-nav">
-                            <li class="active">
-                                <a href=".">Home</a>
+                            <li class="navitem active">
+                                <a href="." class="nav-link">Home</a>
                             </li>
-                            <li >
-                                <a href="CHANGELOG/">Changelog</a>
+                            <li class="navitem">
+                                <a href="CHANGELOG/" class="nav-link">Changelog</a>
                             </li>
-                            <li >
-                                <a href="build/">Build</a>
+                            <li class="navitem">
+                                <a href="build/" class="nav-link">Build</a>
                             </li>
-                            <li >
-                                <a href="cobra/">Cobra</a>
+                            <li class="navitem">
+                                <a href="cobra/" class="nav-link">Cobra</a>
                             </li>
-                            <li >
-                                <a href="design/">Design</a>
+                            <li class="navitem">
+                                <a href="design/" class="nav-link">Design</a>
                             </li>
-                            <li >
-                                <a href="usage/">Examples</a>
+                            <li class="navitem">
+                                <a href="usage/" class="nav-link">Examples</a>
                             </li>
-                            <li >
-                                <a href="ws/">Ws</a>
+                            <li class="navitem">
+                                <a href="ws/" class="nav-link">Ws</a>
                             </li>
                         </ul>
 
-                    <ul class="nav navbar-nav navbar-right">
-                        <li>
-                            <a href="#" data-toggle="modal" data-target="#mkdocs_search_modal">
+                    <ul class="nav navbar-nav ml-auto">
+                        <li class="nav-item">
+                            <a href="#" class="nav-link" data-toggle="modal" data-target="#mkdocs_search_modal">
                                 <i class="fa fa-search"></i> Search
                             </a>
                         </li>
-                            <li class="disabled">
-                                <a rel="next" >
+                            <li class="nav-item">
+                                <a rel="prev" class="nav-link disabled">
                                     <i class="fa fa-arrow-left"></i> Previous
                                 </a>
                             </li>
-                            <li >
-                                <a rel="prev" href="CHANGELOG/">
+                            <li class="nav-item">
+                                <a rel="next" href="CHANGELOG/" class="nav-link">
                                     Next <i class="fa fa-arrow-right"></i>
                                 </a>
                             </li>
@@ -91,15 +78,41 @@
         </div>
 
         <div class="container">
-                <div class="col-md-3"><div class="bs-sidebar hidden-print affix well" role="complementary">
-    <ul class="nav bs-sidenav">
-        <li class="main active"><a href="#introduction">Introduction</a></li>
-        <li class="main "><a href="#example-code">Example code</a></li>
-        <li class="main "><a href="#why-another-library">Why another library?</a></li>
-        <li class="main "><a href="#contributing">Contributing</a></li>
-    </ul>
+            <div class="row">
+                    <div class="col-md-3"><div class="navbar-light navbar-expand-md bs-sidebar hidden-print affix" role="complementary">
+    <div class="navbar-header">
+        <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#toc-collapse" title="Table of Contents">
+            <span class="fa fa-angle-down"></span>
+        </button>
+    </div>
+
+    
+    <div id="toc-collapse" class="navbar-collapse collapse card bg-secondary">
+        <ul class="nav flex-column">
+            
+            <li class="nav-item" data-level="2"><a href="#introduction" class="nav-link">Introduction</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#example-code" class="nav-link">Example code</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#why-another-library" class="nav-link">Why another library?</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#contributing" class="nav-link">Contributing</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+        </ul>
+    </div>
 </div></div>
-                <div class="col-md-9" role="main">
+                    <div class="col-md-9" role="main">
 
 <p><img alt="Alt text" src="https://travis-ci.org/machinezone/IXWebSocket.svg?branch=master" /></p>
 <h2 id="introduction">Introduction</h2>
@@ -144,6 +157,7 @@ webSocket.send(&quot;hello world&quot;);
 <p>We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server.</p>
 <h2 id="contributing">Contributing</h2>
 <p>IXWebSocket is developed on <a href="https://github.com/machinezone/IXWebSocket">GitHub</a>. We'd love to hear about how you use it; opening up an issue on GitHub is ok for that. If things don't work as expected, please create an issue on GitHub, or even better a pull request if you know how to fix your problem.</p></div>
+            </div>
         </div>
 
         <footer class="col-md-12">
@@ -157,19 +171,19 @@ webSocket.send(&quot;hello world&quot;);
         <script src="js/base.js" defer></script>
         <script src="search/main.js" defer></script>
 
-        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="Search Modal" aria-hidden="true">
-    <div class="modal-dialog">
+        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="searchModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="searchModalLabel">Search</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Search</h4>
             </div>
             <div class="modal-body">
                 <p>
                     From here you can search these documents. Enter
                     your search terms below.
                 </p>
-                <form role="form">
+                <form>
                     <div class="form-group">
                         <input type="text" class="form-control" placeholder="Search..." id="mkdocs-search-query" title="Type search term here">
                     </div>
@@ -180,12 +194,12 @@ webSocket.send(&quot;hello world&quot;);
             </div>
         </div>
     </div>
-</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="Keyboard Shortcuts Modal" aria-hidden="true">
+</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="keyboardModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="keyboardModalLabel">Keyboard Shortcuts</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Keyboard Shortcuts</h4>
             </div>
             <div class="modal-body">
               <table class="table">
@@ -225,6 +239,6 @@ webSocket.send(&quot;hello world&quot;);
 </html>
 
 <!--
-MkDocs version : 1.0.4
-Build Date UTC : 2020-02-12 19:33:06
+MkDocs version : 1.1
+Build Date UTC : 2020-02-23 17:49:35
 -->
diff --git a/js/base.js b/js/base.js
index 4755f434..8ba6faa1 100644
--- a/js/base.js
+++ b/js/base.js
@@ -1,38 +1,46 @@
-function getSearchTerm()
-{
+function getSearchTerm() {
     var sPageURL = window.location.search.substring(1);
     var sURLVariables = sPageURL.split('&');
-    for (var i = 0; i < sURLVariables.length; i++)
-    {
+    for (var i = 0; i < sURLVariables.length; i++) {
         var sParameterName = sURLVariables[i].split('=');
-        if (sParameterName[0] == 'q')
-        {
+        if (sParameterName[0] == 'q') {
             return sParameterName[1];
         }
     }
 }
 
+function applyTopPadding() {
+    // Update various absolute positions to match where the main container
+    // starts. This is necessary for handling multi-line nav headers, since
+    // that pushes the main container down.
+    var offset = $('body > .container').offset();
+    $('html').css('scroll-padding-top', offset.top + 'px');
+    $('.bs-sidebar.affix').css('top', offset.top + 'px');
+}
+
 $(document).ready(function() {
 
+    applyTopPadding();
+
     var search_term = getSearchTerm(),
         $search_modal = $('#mkdocs_search_modal'),
         $keyboard_modal = $('#mkdocs_keyboard_modal');
 
-    if(search_term){
+    if (search_term) {
         $search_modal.modal();
     }
 
     // make sure search input gets autofocus everytime modal opens.
-    $search_modal.on('shown.bs.modal', function () {
+    $search_modal.on('shown.bs.modal', function() {
         $search_modal.find('#mkdocs-search-query').focus();
     });
 
     // Close search modal when result is selected
     // The links get added later so listen to parent
     $('#mkdocs-search-results').click(function(e) {
-      if ($(e.target).is('a')) {
-        $search_modal.modal('hide');
-      }
+        if ($(e.target).is('a')) {
+            $search_modal.modal('hide');
+        }
     });
 
     // Populate keyboard modal with proper Keys
@@ -48,10 +56,10 @@ $(document).ready(function() {
         var page;
         switch (key) {
             case shortcuts.next:
-                page = $('[role="navigation"] a:contains(Next):first').prop('href');
+                page = $('.navbar a[rel="next"]:first').prop('href');
                 break;
             case shortcuts.previous:
-                page = $('[role="navigation"] a:contains(Previous):first').prop('href');
+                page = $('.navbar a[rel="prev"]:first').prop('href');
                 break;
             case shortcuts.search:
                 e.preventDefault();
@@ -86,8 +94,67 @@ $(document).ready(function() {
         }, 50);
     });
 
+    function showInnerDropdown(item) {
+        var popup = $(item).next('.dropdown-menu');
+        popup.addClass('show');
+        $(item).addClass('open');
+
+        // First, close any sibling dropdowns.
+        var container = $(item).parent().parent();
+        container.find('> .dropdown-submenu > a').each(function(i, el) {
+            if (el !== item) {
+                hideInnerDropdown(el);
+            }
+        });
+
+        var popupMargin = 10;
+        var maxBottom = $(window).height() - popupMargin;
+        var bounds = item.getBoundingClientRect();
+
+        popup.css('left', bounds.right + 'px');
+        if (bounds.top + popup.height() > maxBottom &&
+            bounds.top > $(window).height() / 2) {
+            popup.css({
+                'top': (bounds.bottom - popup.height()) + 'px',
+                'max-height': (bounds.bottom - popupMargin) + 'px',
+            });
+        } else {
+            popup.css({
+                'top': bounds.top + 'px',
+                'max-height': (maxBottom - bounds.top) + 'px',
+            });
+        }
+    }
+
+    function hideInnerDropdown(item) {
+        var popup = $(item).next('.dropdown-menu');
+        popup.removeClass('show');
+        $(item).removeClass('open');
+
+        popup.scrollTop(0);
+        popup.find('.dropdown-menu').scrollTop(0).removeClass('show');
+        popup.find('.dropdown-submenu > a').removeClass('open');
+    }
+
+    $('.dropdown-submenu > a').on('click', function(e) {
+        if ($(this).next('.dropdown-menu').hasClass('show')) {
+            hideInnerDropdown(this);
+        } else {
+            showInnerDropdown(this);
+        }
+
+        e.stopPropagation();
+        e.preventDefault();
+    });
+
+    $('.dropdown-menu').parent().on('hide.bs.dropdown', function(e) {
+        $(this).find('.dropdown-menu').scrollTop(0);
+        $(this).find('.dropdown-submenu > a').removeClass('open');
+        $(this).find('.dropdown-menu .dropdown-menu').removeClass('show');
+    });
 });
 
+$(window).on('resize', applyTopPadding);
 
 $('body').scrollspy({
     target: '.bs-sidebar',
@@ -100,117 +167,117 @@ $("li.disabled a").click(function() {
 });
 
 // See https://www.cambiaresearch.com/articles/15/javascript-char-codes-key-codes
-// We only list common keys below. Obscure keys are omited and their use is discouraged.
+// We only list common keys below. Obscure keys are omitted and their use is discouraged.
 var keyCodes = {
-  8: 'backspace',
-  9: 'tab',
-  13: 'enter',
-  16: 'shift',
-  17: 'ctrl',
-  18: 'alt',
-  19: 'pause/break',
-  20: 'caps lock',
-  27: 'escape',
-  32: 'spacebar',
-  33: 'page up',
-  34: 'page down',
-  35: 'end',
-  36: 'home',
-  37: '&larr;',
-  38: '&uarr;',
-  39: '&rarr;',
-  40: '&darr;',
-  45: 'insert',
-  46: 'delete',
-  48: '0',
-  49: '1',
-  50: '2',
-  51: '3',
-  52: '4',
-  53: '5',
-  54: '6',
-  55: '7',
-  56: '8',
-  57: '9',
-  65: 'a',
-  66: 'b',
-  67: 'c',
-  68: 'd',
-  69: 'e',
-  70: 'f',
-  71: 'g',
-  72: 'h',
-  73: 'i',
-  74: 'j',
-  75: 'k',
-  76: 'l',
-  77: 'm',
-  78: 'n',
-  79: 'o',
-  80: 'p',
-  81: 'q',
-  82: 'r',
-  83: 's',
-  84: 't',
-  85: 'u',
-  86: 'v',
-  87: 'w',
-  88: 'x',
-  89: 'y',
-  90: 'z',
-  91: 'Left Windows Key / Left ⌘',
-  92: 'Right Windows Key',
-  93: 'Windows Menu / Right ⌘',
-  96: 'numpad 0',
-  97: 'numpad 1',
-  98: 'numpad 2',
-  99: 'numpad 3',
-  100: 'numpad 4',
-  101: 'numpad 5',
-  102: 'numpad 6',
-  103: 'numpad 7',
-  104: 'numpad 8',
-  105: 'numpad 9',
-  106: 'multiply',
-  107: 'add',
-  109: 'subtract',
-  110: 'decimal point',
-  111: 'divide',
-  112: 'f1',
-  113: 'f2',
-  114: 'f3',
-  115: 'f4',
-  116: 'f5',
-  117: 'f6',
-  118: 'f7',
-  119: 'f8',
-  120: 'f9',
-  121: 'f10',
-  122: 'f11',
-  123: 'f12',
-  124: 'f13',
-  125: 'f14',
-  126: 'f15',
-  127: 'f16',
-  128: 'f17',
-  129: 'f18',
-  130: 'f19',
-  131: 'f20',
-  132: 'f21',
-  133: 'f22',
-  134: 'f23',
-  135: 'f24',
-  144: 'num lock',
-  145: 'scroll lock',
-  186: '&semi;',
-  187: '&equals;',
-  188: '&comma;',
-  189: '&hyphen;',
-  190: '&period;',
-  191: '&quest;',
-  192: '&grave;',
-  219: '&lsqb;',
-  220: '&bsol;',
-  221: '&rsqb;',
-  222: '&apos;',
+    8: 'backspace',
+    9: 'tab',
+    13: 'enter',
+    16: 'shift',
+    17: 'ctrl',
+    18: 'alt',
+    19: 'pause/break',
+    20: 'caps lock',
+    27: 'escape',
+    32: 'spacebar',
+    33: 'page up',
+    34: 'page down',
+    35: 'end',
+    36: 'home',
+    37: '&larr;',
+    38: '&uarr;',
+    39: '&rarr;',
+    40: '&darr;',
+    45: 'insert',
+    46: 'delete',
+    48: '0',
+    49: '1',
+    50: '2',
+    51: '3',
+    52: '4',
+    53: '5',
+    54: '6',
+    55: '7',
+    56: '8',
+    57: '9',
+    65: 'a',
+    66: 'b',
+    67: 'c',
+    68: 'd',
+    69: 'e',
+    70: 'f',
+    71: 'g',
+    72: 'h',
+    73: 'i',
+    74: 'j',
+    75: 'k',
+    76: 'l',
+    77: 'm',
+    78: 'n',
+    79: 'o',
+    80: 'p',
+    81: 'q',
+    82: 'r',
+    83: 's',
+    84: 't',
+    85: 'u',
+    86: 'v',
+    87: 'w',
+    88: 'x',
+    89: 'y',
+    90: 'z',
+    91: 'Left Windows Key / Left ⌘',
+    92: 'Right Windows Key',
+    93: 'Windows Menu / Right ⌘',
+    96: 'numpad 0',
+    97: 'numpad 1',
+    98: 'numpad 2',
+    99: 'numpad 3',
+    100: 'numpad 4',
+    101: 'numpad 5',
+    102: 'numpad 6',
+    103: 'numpad 7',
+    104: 'numpad 8',
+    105: 'numpad 9',
+    106: 'multiply',
+    107: 'add',
+    109: 'subtract',
+    110: 'decimal point',
+    111: 'divide',
+    112: 'f1',
+    113: 'f2',
+    114: 'f3',
+    115: 'f4',
+    116: 'f5',
+    117: 'f6',
+    118: 'f7',
+    119: 'f8',
+    120: 'f9',
+    121: 'f10',
+    122: 'f11',
+    123: 'f12',
+    124: 'f13',
+    125: 'f14',
+    126: 'f15',
+    127: 'f16',
+    128: 'f17',
+    129: 'f18',
+    130: 'f19',
+    131: 'f20',
+    132: 'f21',
+    133: 'f22',
+    134: 'f23',
+    135: 'f24',
+    144: 'num lock',
+    145: 'scroll lock',
+    186: '&semi;',
+    187: '&equals;',
+    188: '&comma;',
+    189: '&hyphen;',
+    190: '&period;',
+    191: '&quest;',
+    192: '&grave;',
+    219: '&lsqb;',
+    220: '&bsol;',
+    221: '&rsqb;',
+    222: '&apos;',
 };
diff --git a/js/bootstrap-3.0.3.min.js b/js/bootstrap-3.0.3.min.js
deleted file mode 100644
index 1a6258ef..00000000
--- a/js/bootstrap-3.0.3.min.js
+++ /dev/null
@@ -1,7 +0,0 @@
-/*!
- * Bootstrap v3.0.3 (http://getbootstrap.com)
- * Copyright 2013 Twitter, Inc.
- * Licensed under http://www.apache.org/licenses/LICENSE-2.0
- */
-
-if("undefined"==typeof jQuery)throw new Error("Bootstrap requires jQuery");+function(a){"use strict";function b(){var a=document.createElement("bootstrap"),b={WebkitTransition:"webkitTransitionEnd",MozTransition:"transitionend",OTransition:"oTransitionEnd otransitionend",transition:"transitionend"};for(var c in b)if(void 0!==a.style[c])return{end:b[c]}}a.fn.emulateTransitionEnd=function(b){var c=!1,d=this;a(this).one(a.support.transition.end,function(){c=!0});var e=function(){c||a(d).trigger(a.support.transition.end)};return setTimeout(e,b),this},a(function(){a.support.transition=b()})}(jQuery),+function(a){"use strict";var b='[data-dismiss="alert"]',c=function(c){a(c).on("click",b,this.close)};c.prototype.close=function(b){function c(){f.trigger("closed.bs.alert").remove()}var d=a(this),e=d.attr("data-target");e||(e=d.attr("href"),e=e&&e.replace(/.*(?=#[^\s]*$)/,""));var f=a(e);b&&b.preventDefault(),f.length||(f=d.hasClass("alert")?d:d.parent()),f.trigger(b=a.Event("close.bs.alert")),b.isDefaultPrevented()||(f.removeClass("in"),a.support.transition&&f.hasClass("fade")?f.one(a.support.transition.end,c).emulateTransitionEnd(150):c())};var d=a.fn.alert;a.fn.alert=function(b){return this.each(function(){var d=a(this),e=d.data("bs.alert");e||d.data("bs.alert",e=new c(this)),"string"==typeof b&&e[b].call(d)})},a.fn.alert.Constructor=c,a.fn.alert.noConflict=function(){return a.fn.alert=d,this},a(document).on("click.bs.alert.data-api",b,c.prototype.close)}(jQuery),+function(a){"use strict";var b=function(c,d){this.$element=a(c),this.options=a.extend({},b.DEFAULTS,d)};b.DEFAULTS={loadingText:"loading..."},b.prototype.setState=function(a){var b="disabled",c=this.$element,d=c.is("input")?"val":"html",e=c.data();a+="Text",e.resetText||c.data("resetText",c[d]()),c[d](e[a]||this.options[a]),setTimeout(function(){"loadingText"==a?c.addClass(b).attr(b,b):c.removeClass(b).removeAttr(b)},0)},b.prototype.toggle=function(){var a=this.$element.closest('[data-toggle="buttons"]'),b=!0;if(a.length){var c=this.$element.find("input");"radio"===c.prop("type")&&(c.prop("checked")&&this.$element.hasClass("active")?b=!1:a.find(".active").removeClass("active")),b&&c.prop("checked",!this.$element.hasClass("active")).trigger("change")}b&&this.$element.toggleClass("active")};var c=a.fn.button;a.fn.button=function(c){return this.each(function(){var d=a(this),e=d.data("bs.button"),f="object"==typeof c&&c;e||d.data("bs.button",e=new b(this,f)),"toggle"==c?e.toggle():c&&e.setState(c)})},a.fn.button.Constructor=b,a.fn.button.noConflict=function(){return 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\ No newline at end of file
diff --git a/js/bootstrap.min.js b/js/bootstrap.min.js
new file mode 100644
index 00000000..ca013b70
--- /dev/null
+++ b/js/bootstrap.min.js
@@ -0,0 +1,7 @@
+/*!
+  * Bootstrap v4.3.1 (https://getbootstrap.com/)
+  * Copyright 2011-2019 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
+  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+  */
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wn="bs.tab",An="."+wn,Nn=g.fn.tab,On={HIDE:"hide"+An,HIDDEN:"hidden"+An,SHOW:"show"+An,SHOWN:"shown"+An,CLICK_DATA_API:"click"+An+".data-api"},kn="dropdown-menu",Pn="active",Ln="disabled",jn="fade",Hn="show",Rn=".dropdown",xn=".nav, .list-group",Fn=".active",Un="> li > .active",Wn='[data-toggle="tab"], [data-toggle="pill"], [data-toggle="list"]',qn=".dropdown-toggle",Mn="> .dropdown-menu .active",Kn=function(){function i(t){this._element=t}var t=i.prototype;return t.show=function(){var n=this;if(!(this._element.parentNode&&this._element.parentNode.nodeType===Node.ELEMENT_NODE&&g(this._element).hasClass(Pn)||g(this._element).hasClass(Ln))){var t,i,e=g(this._element).closest(xn)[0],o=_.getSelectorFromElement(this._element);if(e){var r="UL"===e.nodeName||"OL"===e.nodeName?Un:Fn;i=(i=g.makeArray(g(e).find(r)))[i.length-1]}var 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Qn="toast",Bn="bs.toast",Vn="."+Bn,Yn=g.fn[Qn],zn={CLICK_DISMISS:"click.dismiss"+Vn,HIDE:"hide"+Vn,HIDDEN:"hidden"+Vn,SHOW:"show"+Vn,SHOWN:"shown"+Vn},Xn="fade",$n="hide",Gn="show",Jn="showing",Zn={animation:"boolean",autohide:"boolean",delay:"number"},ti={animation:!0,autohide:!0,delay:500},ei='[data-dismiss="toast"]',ni=function(){function i(t,e){this._element=t,this._config=this._getConfig(e),this._timeout=null,this._setListeners()}var t=i.prototype;return t.show=function(){var t=this;g(this._element).trigger(zn.SHOW),this._config.animation&&this._element.classList.add(Xn);var e=function(){t._element.classList.remove(Jn),t._element.classList.add(Gn),g(t._element).trigger(zn.SHOWN),t._config.autohide&&t.hide()};if(this._element.classList.remove($n),this._element.classList.add(Jn),this._config.animation){var n=_.getTransitionDurationFromElement(this._element);g(this._element).one(_.TRANSITION_END,e).emulateTransitionEnd(n)}else e()},t.hide=function(t){var 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e()},i._jQueryInterface=function(n){return this.each(function(){var t=g(this),e=t.data(Bn);if(e||(e=new i(this,"object"==typeof n&&n),t.data(Bn,e)),"string"==typeof n){if("undefined"==typeof e[n])throw new TypeError('No method named "'+n+'"');e[n](this)}})},s(i,null,[{key:"VERSION",get:function(){return"4.3.1"}},{key:"DefaultType",get:function(){return Zn}},{key:"Default",get:function(){return ti}}]),i}();g.fn[Qn]=ni._jQueryInterface,g.fn[Qn].Constructor=ni,g.fn[Qn].noConflict=function(){return g.fn[Qn]=Yn,ni._jQueryInterface},function(){if("undefined"==typeof g)throw new TypeError("Bootstrap's JavaScript requires jQuery. jQuery must be included before Bootstrap's JavaScript.");var t=g.fn.jquery.split(" ")[0].split(".");if(t[0]<2&&t[1]<9||1===t[0]&&9===t[1]&&t[2]<1||4<=t[0])throw new Error("Bootstrap's JavaScript requires at least jQuery v1.9.1 but less than v4.0.0")}(),t.Util=_,t.Alert=p,t.Button=P,t.Carousel=lt,t.Collapse=bt,t.Dropdown=Jt,t.Modal=ve,t.Popover=sn,t.Scrollspy=Dn,t.Tab=Kn,t.Toast=ni,t.Tooltip=Be,Object.defineProperty(t,"__esModule",{value:!0})});
+//# sourceMappingURL=bootstrap.min.js.map
diff --git a/search/lunr.js b/search/lunr.js
index c218cc89..c3537658 100644
--- a/search/lunr.js
+++ b/search/lunr.js
@@ -1,6 +1,6 @@
 /**
- * lunr - http://lunrjs.com - A bit like Solr, but much smaller and not as bright - 2.1.6
- * Copyright (C) 2018 Oliver Nightingale
+ * lunr - http://lunrjs.com - A bit like Solr, but much smaller and not as bright - 2.3.8
+ * Copyright (C) 2019 Oliver Nightingale
  * @license MIT
  */
 
@@ -54,14 +54,15 @@ var lunr = function (config) {
   return builder.build()
 }
 
-lunr.version = "2.1.6"
+lunr.version = "2.3.8"
 /*!
  * lunr.utils
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
  * A namespace containing utils for the rest of the lunr library
+ * @namespace lunr.utils
  */
 lunr.utils = {}
 
@@ -69,7 +70,8 @@ lunr.utils = {}
  * Print a warning message to the console.
  *
  * @param {String} message The message to be printed.
- * @memberOf Utils
+ * @memberOf lunr.utils
+ * @function
  */
 lunr.utils.warn = (function (global) {
   /* eslint-disable no-console */
@@ -90,7 +92,7 @@ lunr.utils.warn = (function (global) {
  *
  * @param {Any} obj The object to convert to a string.
  * @return {String} string representation of the passed object.
- * @memberOf Utils
+ * @memberOf lunr.utils
  */
 lunr.utils.asString = function (obj) {
   if (obj === void 0 || obj === null) {
@@ -99,6 +101,52 @@ lunr.utils.asString = function (obj) {
     return obj.toString()
   }
 }
+
+/**
+ * Clones an object.
+ *
+ * Will create a copy of an existing object such that any mutations
+ * on the copy cannot affect the original.
+ *
+ * Only shallow objects are supported, passing a nested object to this
+ * function will cause a TypeError.
+ *
+ * Objects with primitives, and arrays of primitives are supported.
+ *
+ * @param {Object} obj The object to clone.
+ * @return {Object} a clone of the passed object.
+ * @throws {TypeError} when a nested object is passed.
+ * @memberOf Utils
+ */
+lunr.utils.clone = function (obj) {
+  if (obj === null || obj === undefined) {
+    return obj
+  }
+
+  var clone = Object.create(null),
+      keys = Object.keys(obj)
+
+  for (var i = 0; i < keys.length; i++) {
+    var key = keys[i],
+        val = obj[key]
+
+    if (Array.isArray(val)) {
+      clone[key] = val.slice()
+      continue
+    }
+
+    if (typeof val === 'string' ||
+        typeof val === 'number' ||
+        typeof val === 'boolean') {
+      clone[key] = val
+      continue
+    }
+
+    throw new TypeError("clone is not deep and does not support nested objects")
+  }
+
+  return clone
+}
 lunr.FieldRef = function (docRef, fieldName, stringValue) {
   this.docRef = docRef
   this.fieldName = fieldName
@@ -127,6 +175,139 @@ lunr.FieldRef.prototype.toString = function () {
 
   return this._stringValue
 }
+/*!
+ * lunr.Set
+ * Copyright (C) 2019 Oliver Nightingale
+ */
+
+/**
+ * A lunr set.
+ *
+ * @constructor
+ */
+lunr.Set = function (elements) {
+  this.elements = Object.create(null)
+
+  if (elements) {
+    this.length = elements.length
+
+    for (var i = 0; i < this.length; i++) {
+      this.elements[elements[i]] = true
+    }
+  } else {
+    this.length = 0
+  }
+}
+
+/**
+ * A complete set that contains all elements.
+ *
+ * @static
+ * @readonly
+ * @type {lunr.Set}
+ */
+lunr.Set.complete = {
+  intersect: function (other) {
+    return other
+  },
+
+  union: function (other) {
+    return other
+  },
+
+  contains: function () {
+    return true
+  }
+}
+
+/**
+ * An empty set that contains no elements.
+ *
+ * @static
+ * @readonly
+ * @type {lunr.Set}
+ */
+lunr.Set.empty = {
+  intersect: function () {
+    return this
+  },
+
+  union: function (other) {
+    return other
+  },
+
+  contains: function () {
+    return false
+  }
+}
+
+/**
+ * Returns true if this set contains the specified object.
+ *
+ * @param {object} object - Object whose presence in this set is to be tested.
+ * @returns {boolean} - True if this set contains the specified object.
+ */
+lunr.Set.prototype.contains = function (object) {
+  return !!this.elements[object]
+}
+
+/**
+ * Returns a new set containing only the elements that are present in both
+ * this set and the specified set.
+ *
+ * @param {lunr.Set} other - set to intersect with this set.
+ * @returns {lunr.Set} a new set that is the intersection of this and the specified set.
+ */
+
+lunr.Set.prototype.intersect = function (other) {
+  var a, b, elements, intersection = []
+
+  if (other === lunr.Set.complete) {
+    return this
+  }
+
+  if (other === lunr.Set.empty) {
+    return other
+  }
+
+  if (this.length < other.length) {
+    a = this
+    b = other
+  } else {
+    a = other
+    b = this
+  }
+
+  elements = Object.keys(a.elements)
+
+  for (var i = 0; i < elements.length; i++) {
+    var element = elements[i]
+    if (element in b.elements) {
+      intersection.push(element)
+    }
+  }
+
+  return new lunr.Set (intersection)
+}
+
+/**
+ * Returns a new set combining the elements of this and the specified set.
+ *
+ * @param {lunr.Set} other - set to union with this set.
+ * @return {lunr.Set} a new set that is the union of this and the specified set.
+ */
+
+lunr.Set.prototype.union = function (other) {
+  if (other === lunr.Set.complete) {
+    return lunr.Set.complete
+  }
+
+  if (other === lunr.Set.empty) {
+    return this
+  }
+
+  return new lunr.Set(Object.keys(this.elements).concat(Object.keys(other.elements)))
+}
 /**
  * A function to calculate the inverse document frequency for
  * a posting. This is shared between the builder and the index
@@ -208,7 +389,7 @@ lunr.Token.prototype.clone = function (fn) {
 }
 /*!
  * lunr.tokenizer
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
@@ -220,22 +401,30 @@ lunr.Token.prototype.clone = function (fn) {
  * then will split this string on the character in `lunr.tokenizer.separator`.
  * Arrays will have their elements converted to strings and wrapped in a lunr.Token.
  *
+ * Optional metadata can be passed to the tokenizer, this metadata will be cloned and
+ * added as metadata to every token that is created from the object to be tokenized.
+ *
  * @static
  * @param {?(string|object|object[])} obj - The object to convert into tokens
+ * @param {?object} metadata - Optional metadata to associate with every token
  * @returns {lunr.Token[]}
+ * @see {@link lunr.Pipeline}
  */
-lunr.tokenizer = function (obj) {
+lunr.tokenizer = function (obj, metadata) {
   if (obj == null || obj == undefined) {
     return []
   }
 
   if (Array.isArray(obj)) {
     return obj.map(function (t) {
-      return new lunr.Token(lunr.utils.asString(t).toLowerCase())
+      return new lunr.Token(
+        lunr.utils.asString(t).toLowerCase(),
+        lunr.utils.clone(metadata)
+      )
     })
   }
 
-  var str = obj.toString().trim().toLowerCase(),
+  var str = obj.toString().toLowerCase(),
       len = str.length,
       tokens = []
 
@@ -246,11 +435,15 @@ lunr.tokenizer = function (obj) {
     if ((char.match(lunr.tokenizer.separator) || sliceEnd == len)) {
 
       if (sliceLength > 0) {
+        var tokenMetadata = lunr.utils.clone(metadata) || {}
+        tokenMetadata["position"] = [sliceStart, sliceLength]
+        tokenMetadata["index"] = tokens.length
+
         tokens.push(
-          new lunr.Token (str.slice(sliceStart, sliceEnd), {
-            position: [sliceStart, sliceLength],
-            index: tokens.length
-          })
+          new lunr.Token (
+            str.slice(sliceStart, sliceEnd),
+            tokenMetadata
+          )
         )
       }
 
@@ -272,7 +465,7 @@ lunr.tokenizer = function (obj) {
 lunr.tokenizer.separator = /[\s\-]+/
 /*!
  * lunr.Pipeline
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
@@ -316,8 +509,8 @@ lunr.Pipeline.registeredFunctions = Object.create(null)
  * or mutate (or add) metadata for a given token.
  *
  * A pipeline function can indicate that the passed token should be discarded by returning
- * null. This token will not be passed to any downstream pipeline functions and will not be
- * added to the index.
+ * null, undefined or an empty string. This token will not be passed to any downstream pipeline
+ * functions and will not be added to the index.
  *
  * Multiple tokens can be returned by returning an array of tokens. Each token will be passed
  * to any downstream pipeline functions and all will returned tokens will be added to the index.
@@ -480,9 +673,9 @@ lunr.Pipeline.prototype.run = function (tokens) {
     for (var j = 0; j < tokens.length; j++) {
       var result = fn(tokens[j], j, tokens)
 
-      if (result === void 0 || result === '') continue
+      if (result === null || result === void 0 || result === '') continue
 
-      if (result instanceof Array) {
+      if (Array.isArray(result)) {
         for (var k = 0; k < result.length; k++) {
           memo.push(result[k])
         }
@@ -503,10 +696,12 @@ lunr.Pipeline.prototype.run = function (tokens) {
  * token and mapping the resulting tokens back to strings.
  *
  * @param {string} str - The string to pass through the pipeline.
+ * @param {?object} metadata - Optional metadata to associate with the token
+ * passed to the pipeline.
  * @returns {string[]}
  */
-lunr.Pipeline.prototype.runString = function (str) {
-  var token = new lunr.Token (str)
+lunr.Pipeline.prototype.runString = function (str, metadata) {
+  var token = new lunr.Token (str, metadata)
 
   return this.run([token]).map(function (t) {
     return t.toString()
@@ -537,7 +732,7 @@ lunr.Pipeline.prototype.toJSON = function () {
 }
 /*!
  * lunr.Vector
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
@@ -698,15 +893,14 @@ lunr.Vector.prototype.dot = function (otherVector) {
 }
 
 /**
- * Calculates the cosine similarity between this vector and another
- * vector.
+ * Calculates the similarity between this vector and another vector.
  *
  * @param {lunr.Vector} otherVector - The other vector to calculate the
  * similarity with.
  * @returns {Number}
  */
 lunr.Vector.prototype.similarity = function (otherVector) {
-  return this.dot(otherVector) / (this.magnitude() * otherVector.magnitude())
+  return this.dot(otherVector) / this.magnitude() || 0
 }
 
 /**
@@ -735,7 +929,7 @@ lunr.Vector.prototype.toJSON = function () {
 /* eslint-disable */
 /*!
  * lunr.stemmer
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  * Includes code from - http://tartarus.org/~martin/PorterStemmer/js.txt
  */
 
@@ -748,6 +942,7 @@ lunr.Vector.prototype.toJSON = function () {
  * @param {lunr.Token} token - The string to stem
  * @returns {lunr.Token}
  * @see {@link lunr.Pipeline}
+ * @function
  */
 lunr.stemmer = (function(){
   var step2list = {
@@ -956,7 +1151,7 @@ lunr.stemmer = (function(){
 lunr.Pipeline.registerFunction(lunr.stemmer, 'stemmer')
 /*!
  * lunr.stopWordFilter
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
@@ -966,6 +1161,7 @@ lunr.Pipeline.registerFunction(lunr.stemmer, 'stemmer')
  * The built in lunr.stopWordFilter is built using this generator and can be used
  * to generate custom stopWordFilters for applications or non English languages.
  *
+ * @function
  * @param {Array} token The token to pass through the filter
  * @returns {lunr.PipelineFunction}
  * @see lunr.Pipeline
@@ -989,6 +1185,7 @@ lunr.generateStopWordFilter = function (stopWords) {
  * This is intended to be used in the Pipeline. If the token does not pass the
  * filter then undefined will be returned.
  *
+ * @function
  * @implements {lunr.PipelineFunction}
  * @params {lunr.Token} token - A token to check for being a stop word.
  * @returns {lunr.Token}
@@ -1119,7 +1316,7 @@ lunr.stopWordFilter = lunr.generateStopWordFilter([
 lunr.Pipeline.registerFunction(lunr.stopWordFilter, 'stopWordFilter')
 /*!
  * lunr.trimmer
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
@@ -1146,7 +1343,7 @@ lunr.trimmer = function (token) {
 lunr.Pipeline.registerFunction(lunr.trimmer, 'trimmer')
 /*!
  * lunr.TokenSet
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
@@ -1263,50 +1460,58 @@ lunr.TokenSet.fromFuzzyString = function (str, editDistance) {
 
       if (frame.str.length == 1) {
         noEditNode.final = true
-      } else {
-        stack.push({
-          node: noEditNode,
-          editsRemaining: frame.editsRemaining,
-          str: frame.str.slice(1)
-        })
       }
+
+      stack.push({
+        node: noEditNode,
+        editsRemaining: frame.editsRemaining,
+        str: frame.str.slice(1)
+      })
     }
 
+    if (frame.editsRemaining == 0) {
+      continue
+    }
+
+    // insertion
+    if ("*" in frame.node.edges) {
+      var insertionNode = frame.node.edges["*"]
+    } else {
+      var insertionNode = new lunr.TokenSet
+      frame.node.edges["*"] = insertionNode
+    }
+
+    if (frame.str.length == 0) {
+      insertionNode.final = true
+    }
+
+    stack.push({
+      node: insertionNode,
+      editsRemaining: frame.editsRemaining - 1,
+      str: frame.str
+    })
+
     // deletion
     // can only do a deletion if we have enough edits remaining
     // and if there are characters left to delete in the string
-    if (frame.editsRemaining > 0 && frame.str.length > 1) {
-      var char = frame.str.charAt(1),
-          deletionNode
-
-      if (char in frame.node.edges) {
-        deletionNode = frame.node.edges[char]
-      } else {
-        deletionNode = new lunr.TokenSet
-        frame.node.edges[char] = deletionNode
-      }
-
-      if (frame.str.length <= 2) {
-        deletionNode.final = true
-      } else {
-        stack.push({
-          node: deletionNode,
-          editsRemaining: frame.editsRemaining - 1,
-          str: frame.str.slice(2)
-        })
-      }
+    if (frame.str.length > 1) {
+      stack.push({
+        node: frame.node,
+        editsRemaining: frame.editsRemaining - 1,
+        str: frame.str.slice(1)
+      })
     }
 
     // deletion
     // just removing the last character from the str
-    if (frame.editsRemaining > 0 && frame.str.length == 1) {
+    if (frame.str.length == 1) {
       frame.node.final = true
     }
 
     // substitution
     // can only do a substitution if we have enough edits remaining
     // and if there are characters left to substitute
-    if (frame.editsRemaining > 0 && frame.str.length >= 1) {
+    if (frame.str.length >= 1) {
       if ("*" in frame.node.edges) {
         var substitutionNode = frame.node.edges["*"]
       } else {
@@ -1316,40 +1521,19 @@ lunr.TokenSet.fromFuzzyString = function (str, editDistance) {
 
       if (frame.str.length == 1) {
         substitutionNode.final = true
-      } else {
-        stack.push({
-          node: substitutionNode,
-          editsRemaining: frame.editsRemaining - 1,
-          str: frame.str.slice(1)
-        })
-      }
-    }
-
-    // insertion
-    // can only do insertion if there are edits remaining
-    if (frame.editsRemaining > 0) {
-      if ("*" in frame.node.edges) {
-        var insertionNode = frame.node.edges["*"]
-      } else {
-        var insertionNode = new lunr.TokenSet
-        frame.node.edges["*"] = insertionNode
       }
 
-      if (frame.str.length == 0) {
-        insertionNode.final = true
-      } else {
-        stack.push({
-          node: insertionNode,
-          editsRemaining: frame.editsRemaining - 1,
-          str: frame.str
-        })
-      }
+      stack.push({
+        node: substitutionNode,
+        editsRemaining: frame.editsRemaining - 1,
+        str: frame.str.slice(1)
+      })
     }
 
     // transposition
     // can only do a transposition if there are edits remaining
     // and there are enough characters to transpose
-    if (frame.editsRemaining > 0 && frame.str.length > 1) {
+    if (frame.str.length > 1) {
       var charA = frame.str.charAt(0),
           charB = frame.str.charAt(1),
           transposeNode
@@ -1363,13 +1547,13 @@ lunr.TokenSet.fromFuzzyString = function (str, editDistance) {
 
       if (frame.str.length == 1) {
         transposeNode.final = true
-      } else {
-        stack.push({
-          node: transposeNode,
-          editsRemaining: frame.editsRemaining - 1,
-          str: charA + frame.str.slice(2)
-        })
       }
+
+      stack.push({
+        node: transposeNode,
+        editsRemaining: frame.editsRemaining - 1,
+        str: charA + frame.str.slice(2)
+      })
     }
   }
 
@@ -1388,14 +1572,13 @@ lunr.TokenSet.fromFuzzyString = function (str, editDistance) {
  */
 lunr.TokenSet.fromString = function (str) {
   var node = new lunr.TokenSet,
-      root = node,
-      wildcardFound = false
+      root = node
 
   /*
    * Iterates through all characters within the passed string
    * appending a node for each character.
    *
-   * As soon as a wildcard character is found then a self
+   * When a wildcard character is found then a self
    * referencing edge is introduced to continually match
    * any number of any characters.
    */
@@ -1404,7 +1587,6 @@ lunr.TokenSet.fromString = function (str) {
         final = (i == len - 1)
 
     if (char == "*") {
-      wildcardFound = true
       node.edges[char] = node
       node.final = final
 
@@ -1414,11 +1596,6 @@ lunr.TokenSet.fromString = function (str) {
 
       node.edges[char] = next
       node = next
-
-      // TODO: is this needed anymore?
-      if (wildcardFound) {
-        node.edges["*"] = root
-      }
     }
   }
 
@@ -1429,6 +1606,10 @@ lunr.TokenSet.fromString = function (str) {
  * Converts this TokenSet into an array of strings
  * contained within the TokenSet.
  *
+ * This is not intended to be used on a TokenSet that
+ * contains wildcards, in these cases the results are
+ * undefined and are likely to cause an infinite loop.
+ *
  * @returns {string[]}
  */
 lunr.TokenSet.prototype.toArray = function () {
@@ -1445,6 +1626,11 @@ lunr.TokenSet.prototype.toArray = function () {
         len = edges.length
 
     if (frame.node.final) {
+      /* In Safari, at this point the prefix is sometimes corrupted, see:
+       * https://github.com/olivernn/lunr.js/issues/279 Calling any
+       * String.prototype method forces Safari to "cast" this string to what
+       * it's supposed to be, fixing the bug. */
+      frame.prefix.charAt(0)
       words.push(frame.prefix)
     }
 
@@ -1641,7 +1827,7 @@ lunr.TokenSet.Builder.prototype.minimize = function (downTo) {
 }
 /*!
  * lunr.Index
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
@@ -1655,7 +1841,7 @@ lunr.TokenSet.Builder.prototype.minimize = function (downTo) {
  * @constructor
  * @param {Object} attrs - The attributes of the built search index.
  * @param {Object} attrs.invertedIndex - An index of term/field to document reference.
- * @param {Object<string, lunr.Vector>} attrs.documentVectors - Document vectors keyed by document reference.
+ * @param {Object<string, lunr.Vector>} attrs.fieldVectors - Field vectors
  * @param {lunr.TokenSet} attrs.tokenSet - An set of all corpus tokens.
  * @param {string[]} attrs.fields - The names of indexed document fields.
  * @param {lunr.Pipeline} attrs.pipeline - The pipeline to use for search terms.
@@ -1701,6 +1887,12 @@ lunr.Index = function (attrs) {
  * to provide fuzzy matching, e.g. 'hello~2' will match documents with hello with an edit distance of 2.
  * Avoid large values for edit distance to improve query performance.
  *
+ * Each term also supports a presence modifier. By default a term's presence in document is optional, however
+ * this can be changed to either required or prohibited. For a term's presence to be required in a document the
+ * term should be prefixed with a '+', e.g. `+foo bar` is a search for documents that must contain 'foo' and
+ * optionally contain 'bar'. Conversely a leading '-' sets the terms presence to prohibited, i.e. it must not
+ * appear in a document, e.g. `-foo bar` is a search for documents that do not contain 'foo' but may contain 'bar'.
+ *
  * To escape special characters the backslash character '\' can be used, this allows searches to include
  * characters that would normally be considered modifiers, e.g. `foo\~2` will search for a term "foo~2" instead
  * of attempting to apply a boost of 2 to the search term "foo".
@@ -1716,13 +1908,16 @@ lunr.Index = function (attrs) {
  * hello^10
  * @example <caption>term with an edit distance of 2</caption>
  * hello~2
+ * @example <caption>terms with presence modifiers</caption>
+ * -foo +bar baz
  */
 
 /**
  * Performs a search against the index using lunr query syntax.
  *
  * Results will be returned sorted by their score, the most relevant results
- * will be returned first.
+ * will be returned first.  For details on how the score is calculated, please see
+ * the {@link https://lunrjs.com/guides/searching.html#scoring|guide}.
  *
  * For more programmatic querying use lunr.Index#query.
  *
@@ -1773,7 +1968,18 @@ lunr.Index.prototype.query = function (fn) {
   var query = new lunr.Query(this.fields),
       matchingFields = Object.create(null),
       queryVectors = Object.create(null),
-      termFieldCache = Object.create(null)
+      termFieldCache = Object.create(null),
+      requiredMatches = Object.create(null),
+      prohibitedMatches = Object.create(null)
+
+  /*
+   * To support field level boosts a query vector is created per
+   * field. An empty vector is eagerly created to support negated
+   * queries.
+   */
+  for (var i = 0; i < this.fields.length; i++) {
+    queryVectors[this.fields[i]] = new lunr.Vector
+  }
 
   fn.call(query, query)
 
@@ -1787,10 +1993,13 @@ lunr.Index.prototype.query = function (fn) {
      * for a single query term.
      */
     var clause = query.clauses[i],
-        terms = null
+        terms = null,
+        clauseMatches = lunr.Set.complete
 
     if (clause.usePipeline) {
-      terms = this.pipeline.runString(clause.term)
+      terms = this.pipeline.runString(clause.term, {
+        fields: clause.fields
+      })
     } else {
       terms = [clause.term]
     }
@@ -1814,6 +2023,21 @@ lunr.Index.prototype.query = function (fn) {
       var termTokenSet = lunr.TokenSet.fromClause(clause),
           expandedTerms = this.tokenSet.intersect(termTokenSet).toArray()
 
+      /*
+       * If a term marked as required does not exist in the tokenSet it is
+       * impossible for the search to return any matches. We set all the field
+       * scoped required matches set to empty and stop examining any further
+       * clauses.
+       */
+      if (expandedTerms.length === 0 && clause.presence === lunr.Query.presence.REQUIRED) {
+        for (var k = 0; k < clause.fields.length; k++) {
+          var field = clause.fields[k]
+          requiredMatches[field] = lunr.Set.empty
+        }
+
+        break
+      }
+
       for (var j = 0; j < expandedTerms.length; j++) {
         /*
          * For each term get the posting and termIndex, this is required for
@@ -1835,26 +2059,50 @@ lunr.Index.prototype.query = function (fn) {
           var field = clause.fields[k],
               fieldPosting = posting[field],
               matchingDocumentRefs = Object.keys(fieldPosting),
-              termField = expandedTerm + "/" + field
+              termField = expandedTerm + "/" + field,
+              matchingDocumentsSet = new lunr.Set(matchingDocumentRefs)
 
           /*
-           * To support field level boosts a query vector is created per
-           * field. This vector is populated using the termIndex found for
-           * the term and a unit value with the appropriate boost applied.
+           * if the presence of this term is required ensure that the matching
+           * documents are added to the set of required matches for this clause.
            *
-           * If the query vector for this field does not exist yet it needs
-           * to be created.
            */
-          if (queryVectors[field] === undefined) {
-            queryVectors[field] = new lunr.Vector
+          if (clause.presence == lunr.Query.presence.REQUIRED) {
+            clauseMatches = clauseMatches.union(matchingDocumentsSet)
+
+            if (requiredMatches[field] === undefined) {
+              requiredMatches[field] = lunr.Set.complete
+            }
           }
 
           /*
+           * if the presence of this term is prohibited ensure that the matching
+           * documents are added to the set of prohibited matches for this field,
+           * creating that set if it does not yet exist.
+           */
+          if (clause.presence == lunr.Query.presence.PROHIBITED) {
+            if (prohibitedMatches[field] === undefined) {
+              prohibitedMatches[field] = lunr.Set.empty
+            }
+
+            prohibitedMatches[field] = prohibitedMatches[field].union(matchingDocumentsSet)
+
+            /*
+             * Prohibited matches should not be part of the query vector used for
+             * similarity scoring and no metadata should be extracted so we continue
+             * to the next field
+             */
+            continue
+          }
+
+          /*
+           * The query field vector is populated using the termIndex found for
+           * the term and a unit value with the appropriate boost applied.
            * Using upsert because there could already be an entry in the vector
            * for the term we are working with. In that case we just add the scores
            * together.
            */
-          queryVectors[field].upsert(termIndex, 1 * clause.boost, function (a, b) { return a + b })
+          queryVectors[field].upsert(termIndex, clause.boost, function (a, b) { return a + b })
 
           /**
            * If we've already seen this term, field combo then we've already collected
@@ -1888,12 +2136,65 @@ lunr.Index.prototype.query = function (fn) {
         }
       }
     }
+
+    /**
+     * If the presence was required we need to update the requiredMatches field sets.
+     * We do this after all fields for the term have collected their matches because
+     * the clause terms presence is required in _any_ of the fields not _all_ of the
+     * fields.
+     */
+    if (clause.presence === lunr.Query.presence.REQUIRED) {
+      for (var k = 0; k < clause.fields.length; k++) {
+        var field = clause.fields[k]
+        requiredMatches[field] = requiredMatches[field].intersect(clauseMatches)
+      }
+    }
+  }
+
+  /**
+   * Need to combine the field scoped required and prohibited
+   * matching documents into a global set of required and prohibited
+   * matches
+   */
+  var allRequiredMatches = lunr.Set.complete,
+      allProhibitedMatches = lunr.Set.empty
+
+  for (var i = 0; i < this.fields.length; i++) {
+    var field = this.fields[i]
+
+    if (requiredMatches[field]) {
+      allRequiredMatches = allRequiredMatches.intersect(requiredMatches[field])
+    }
+
+    if (prohibitedMatches[field]) {
+      allProhibitedMatches = allProhibitedMatches.union(prohibitedMatches[field])
+    }
   }
 
   var matchingFieldRefs = Object.keys(matchingFields),
       results = [],
       matches = Object.create(null)
 
+  /*
+   * If the query is negated (contains only prohibited terms)
+   * we need to get _all_ fieldRefs currently existing in the
+   * index. This is only done when we know that the query is
+   * entirely prohibited terms to avoid any cost of getting all
+   * fieldRefs unnecessarily.
+   *
+   * Additionally, blank MatchData must be created to correctly
+   * populate the results.
+   */
+  if (query.isNegated()) {
+    matchingFieldRefs = Object.keys(this.fieldVectors)
+
+    for (var i = 0; i < matchingFieldRefs.length; i++) {
+      var matchingFieldRef = matchingFieldRefs[i]
+      var fieldRef = lunr.FieldRef.fromString(matchingFieldRef)
+      matchingFields[matchingFieldRef] = new lunr.MatchData
+    }
+  }
+
   for (var i = 0; i < matchingFieldRefs.length; i++) {
     /*
      * Currently we have document fields that match the query, but we
@@ -1904,8 +2205,17 @@ lunr.Index.prototype.query = function (fn) {
      * above, and combined into a final document score using addition.
      */
     var fieldRef = lunr.FieldRef.fromString(matchingFieldRefs[i]),
-        docRef = fieldRef.docRef,
-        fieldVector = this.fieldVectors[fieldRef],
+        docRef = fieldRef.docRef
+
+    if (!allRequiredMatches.contains(docRef)) {
+      continue
+    }
+
+    if (allProhibitedMatches.contains(docRef)) {
+      continue
+    }
+
+    var fieldVector = this.fieldVectors[fieldRef],
         score = queryVectors[fieldRef.fieldName].similarity(fieldVector),
         docMatch
 
@@ -1970,7 +2280,7 @@ lunr.Index.load = function (serializedIndex) {
   var attrs = {},
       fieldVectors = {},
       serializedVectors = serializedIndex.fieldVectors,
-      invertedIndex = {},
+      invertedIndex = Object.create(null),
       serializedInvertedIndex = serializedIndex.invertedIndex,
       tokenSetBuilder = new lunr.TokenSet.Builder,
       pipeline = lunr.Pipeline.load(serializedIndex.pipeline)
@@ -2009,7 +2319,7 @@ lunr.Index.load = function (serializedIndex) {
 }
 /*!
  * lunr.Builder
- * Copyright (C) 2018 Oliver Nightingale
+ * Copyright (C) 2019 Oliver Nightingale
  */
 
 /**
@@ -2038,7 +2348,8 @@ lunr.Index.load = function (serializedIndex) {
  */
 lunr.Builder = function () {
   this._ref = "id"
-  this._fields = []
+  this._fields = Object.create(null)
+  this._documents = Object.create(null)
   this.invertedIndex = Object.create(null)
   this.fieldTermFrequencies = {}
   this.fieldLengths = {}
@@ -2068,6 +2379,20 @@ lunr.Builder.prototype.ref = function (ref) {
   this._ref = ref
 }
 
+/**
+ * A function that is used to extract a field from a document.
+ *
+ * Lunr expects a field to be at the top level of a document, if however the field
+ * is deeply nested within a document an extractor function can be used to extract
+ * the right field for indexing.
+ *
+ * @callback fieldExtractor
+ * @param {object} doc - The document being added to the index.
+ * @returns {?(string|object|object[])} obj - The object that will be indexed for this field.
+ * @example <caption>Extracting a nested field</caption>
+ * function (doc) { return doc.nested.field }
+ */
+
 /**
  * Adds a field to the list of document fields that will be indexed. Every document being
  * indexed should have this field. Null values for this field in indexed documents will
@@ -2076,10 +2401,22 @@ lunr.Builder.prototype.ref = function (ref) {
  * All fields should be added before adding documents to the index. Adding fields after
  * a document has been indexed will have no effect on already indexed documents.
  *
- * @param {string} field - The name of a field to index in all documents.
+ * Fields can be boosted at build time. This allows terms within that field to have more
+ * importance when ranking search results. Use a field boost to specify that matches within
+ * one field are more important than other fields.
+ *
+ * @param {string} fieldName - The name of a field to index in all documents.
+ * @param {object} attributes - Optional attributes associated with this field.
+ * @param {number} [attributes.boost=1] - Boost applied to all terms within this field.
+ * @param {fieldExtractor} [attributes.extractor] - Function to extract a field from a document.
+ * @throws {RangeError} fieldName cannot contain unsupported characters '/'
  */
-lunr.Builder.prototype.field = function (field) {
-  this._fields.push(field)
+lunr.Builder.prototype.field = function (fieldName, attributes) {
+  if (/\//.test(fieldName)) {
+    throw new RangeError ("Field '" + fieldName + "' contains illegal character '/'")
+  }
+
+  this._fields[fieldName] = attributes || {}
 }
 
 /**
@@ -2121,17 +2458,27 @@ lunr.Builder.prototype.k1 = function (number) {
  * it should have all fields defined for indexing, though null or undefined values will not
  * cause errors.
  *
+ * Entire documents can be boosted at build time. Applying a boost to a document indicates that
+ * this document should rank higher in search results than other documents.
+ *
  * @param {object} doc - The document to add to the index.
+ * @param {object} attributes - Optional attributes associated with this document.
+ * @param {number} [attributes.boost=1] - Boost applied to all terms within this document.
  */
-lunr.Builder.prototype.add = function (doc) {
-  var docRef = doc[this._ref]
+lunr.Builder.prototype.add = function (doc, attributes) {
+  var docRef = doc[this._ref],
+      fields = Object.keys(this._fields)
 
+  this._documents[docRef] = attributes || {}
   this.documentCount += 1
 
-  for (var i = 0; i < this._fields.length; i++) {
-    var fieldName = this._fields[i],
-        field = doc[fieldName],
-        tokens = this.tokenizer(field),
+  for (var i = 0; i < fields.length; i++) {
+    var fieldName = fields[i],
+        extractor = this._fields[fieldName].extractor,
+        field = extractor ? extractor(doc) : doc[fieldName],
+        tokens = this.tokenizer(field, {
+          fields: [fieldName]
+        }),
         terms = this.pipeline.run(tokens),
         fieldRef = new lunr.FieldRef (docRef, fieldName),
         fieldTerms = Object.create(null)
@@ -2159,8 +2506,8 @@ lunr.Builder.prototype.add = function (doc) {
         posting["_index"] = this.termIndex
         this.termIndex += 1
 
-        for (var k = 0; k < this._fields.length; k++) {
-          posting[this._fields[k]] = Object.create(null)
+        for (var k = 0; k < fields.length; k++) {
+          posting[fields[k]] = Object.create(null)
         }
 
         this.invertedIndex[term] = posting
@@ -2211,9 +2558,11 @@ lunr.Builder.prototype.calculateAverageFieldLengths = function () {
     accumulator[field] += this.fieldLengths[fieldRef]
   }
 
-  for (var i = 0; i < this._fields.length; i++) {
-    var field = this._fields[i]
-    accumulator[field] = accumulator[field] / documentsWithField[field]
+  var fields = Object.keys(this._fields)
+
+  for (var i = 0; i < fields.length; i++) {
+    var fieldName = fields[i]
+    accumulator[fieldName] = accumulator[fieldName] / documentsWithField[fieldName]
   }
 
   this.averageFieldLength = accumulator
@@ -2232,13 +2581,17 @@ lunr.Builder.prototype.createFieldVectors = function () {
 
   for (var i = 0; i < fieldRefsLength; i++) {
     var fieldRef = lunr.FieldRef.fromString(fieldRefs[i]),
-        field = fieldRef.fieldName,
+        fieldName = fieldRef.fieldName,
         fieldLength = this.fieldLengths[fieldRef],
         fieldVector = new lunr.Vector,
         termFrequencies = this.fieldTermFrequencies[fieldRef],
         terms = Object.keys(termFrequencies),
         termsLength = terms.length
 
+
+    var fieldBoost = this._fields[fieldName].boost || 1,
+        docBoost = this._documents[fieldRef.docRef].boost || 1
+
     for (var j = 0; j < termsLength; j++) {
       var term = terms[j],
           tf = termFrequencies[term],
@@ -2252,7 +2605,9 @@ lunr.Builder.prototype.createFieldVectors = function () {
         idf = termIdfCache[term]
       }
 
-      score = idf * ((this._k1 + 1) * tf) / (this._k1 * (1 - this._b + this._b * (fieldLength / this.averageFieldLength[field])) + tf)
+      score = idf * ((this._k1 + 1) * tf) / (this._k1 * (1 - this._b + this._b * (fieldLength / this.averageFieldLength[fieldName])) + tf)
+      score *= fieldBoost
+      score *= docBoost
       scoreWithPrecision = Math.round(score * 1000) / 1000
       // Converts 1.23456789 to 1.234.
       // Reducing the precision so that the vectors take up less
@@ -2298,7 +2653,7 @@ lunr.Builder.prototype.build = function () {
     invertedIndex: this.invertedIndex,
     fieldVectors: this.fieldVectors,
     tokenSet: this.tokenSet,
-    fields: this._fields,
+    fields: Object.keys(this._fields),
     pipeline: this.searchPipeline
   })
 }
@@ -2336,7 +2691,7 @@ lunr.Builder.prototype.use = function (fn) {
  */
 lunr.MatchData = function (term, field, metadata) {
   var clonedMetadata = Object.create(null),
-      metadataKeys = Object.keys(metadata)
+      metadataKeys = Object.keys(metadata || {})
 
   // Cloning the metadata to prevent the original
   // being mutated during match data combination.
@@ -2349,8 +2704,11 @@ lunr.MatchData = function (term, field, metadata) {
   }
 
   this.metadata = Object.create(null)
-  this.metadata[term] = Object.create(null)
-  this.metadata[term][field] = clonedMetadata
+
+  if (term !== undefined) {
+    this.metadata[term] = Object.create(null)
+    this.metadata[term][field] = clonedMetadata
+  }
 }
 
 /**
@@ -2465,11 +2823,42 @@ lunr.Query = function (allFields) {
  *   wildcard: lunr.Query.wildcard.LEADING | lunr.Query.wildcard.TRAILING
  * })
  */
+
 lunr.Query.wildcard = new String ("*")
 lunr.Query.wildcard.NONE = 0
 lunr.Query.wildcard.LEADING = 1
 lunr.Query.wildcard.TRAILING = 2
 
+/**
+ * Constants for indicating what kind of presence a term must have in matching documents.
+ *
+ * @constant
+ * @enum {number}
+ * @see lunr.Query~Clause
+ * @see lunr.Query#clause
+ * @see lunr.Query#term
+ * @example <caption>query term with required presence</caption>
+ * query.term('foo', { presence: lunr.Query.presence.REQUIRED })
+ */
+lunr.Query.presence = {
+  /**
+   * Term's presence in a document is optional, this is the default value.
+   */
+  OPTIONAL: 1,
+
+  /**
+   * Term's presence in a document is required, documents that do not contain
+   * this term will not be returned.
+   */
+  REQUIRED: 2,
+
+  /**
+   * Term's presence in a document is prohibited, documents that do contain
+   * this term will not be returned.
+   */
+  PROHIBITED: 3
+}
+
 /**
  * A single clause in a {@link lunr.Query} contains a term and details on how to
  * match that term against a {@link lunr.Index}.
@@ -2479,7 +2868,8 @@ lunr.Query.wildcard.TRAILING = 2
  * @property {number} [boost=1] - Any boost that should be applied when matching this clause.
  * @property {number} [editDistance] - Whether the term should have fuzzy matching applied, and how fuzzy the match should be.
  * @property {boolean} [usePipeline] - Whether the term should be passed through the search pipeline.
- * @property {number} [wildcard=0] - Whether the term should have wildcards appended or prepended.
+ * @property {number} [wildcard=lunr.Query.wildcard.NONE] - Whether the term should have wildcards appended or prepended.
+ * @property {number} [presence=lunr.Query.presence.OPTIONAL] - The terms presence in any matching documents.
  */
 
 /**
@@ -2517,17 +2907,44 @@ lunr.Query.prototype.clause = function (clause) {
     clause.term = "" + clause.term + "*"
   }
 
+  if (!('presence' in clause)) {
+    clause.presence = lunr.Query.presence.OPTIONAL
+  }
+
   this.clauses.push(clause)
 
   return this
 }
 
+/**
+ * A negated query is one in which every clause has a presence of
+ * prohibited. These queries require some special processing to return
+ * the expected results.
+ *
+ * @returns boolean
+ */
+lunr.Query.prototype.isNegated = function () {
+  for (var i = 0; i < this.clauses.length; i++) {
+    if (this.clauses[i].presence != lunr.Query.presence.PROHIBITED) {
+      return false
+    }
+  }
+
+  return true
+}
+
 /**
  * Adds a term to the current query, under the covers this will create a {@link lunr.Query~Clause}
  * to the list of clauses that make up this query.
  *
- * @param {string} term - The term to add to the query.
- * @param {Object} [options] - Any additional properties to add to the query clause.
+ * The term is used as is, i.e. no tokenization will be performed by this method. Instead conversion
+ * to a token or token-like string should be done before calling this method.
+ *
+ * The term will be converted to a string by calling `toString`. Multiple terms can be passed as an
+ * array, each term in the array will share the same options.
+ *
+ * @param {object|object[]} term - The term(s) to add to the query.
+ * @param {object} [options] - Any additional properties to add to the query clause.
  * @returns {lunr.Query}
  * @see lunr.Query#clause
  * @see lunr.Query~Clause
@@ -2539,10 +2956,17 @@ lunr.Query.prototype.clause = function (clause) {
  *   boost: 10,
  *   wildcard: lunr.Query.wildcard.TRAILING
  * })
+ * @example <caption>using lunr.tokenizer to convert a string to tokens before using them as terms</caption>
+ * query.term(lunr.tokenizer("foo bar"))
  */
 lunr.Query.prototype.term = function (term, options) {
+  if (Array.isArray(term)) {
+    term.forEach(function (t) { this.term(t, lunr.utils.clone(options)) }, this)
+    return this
+  }
+
   var clause = options || {}
-  clause.term = term
+  clause.term = term.toString()
 
   this.clause(clause)
 
@@ -2654,6 +3078,7 @@ lunr.QueryLexer.FIELD = 'FIELD'
 lunr.QueryLexer.TERM = 'TERM'
 lunr.QueryLexer.EDIT_DISTANCE = 'EDIT_DISTANCE'
 lunr.QueryLexer.BOOST = 'BOOST'
+lunr.QueryLexer.PRESENCE = 'PRESENCE'
 
 lunr.QueryLexer.lexField = function (lexer) {
   lexer.backup()
@@ -2742,6 +3167,22 @@ lunr.QueryLexer.lexText = function (lexer) {
       return lunr.QueryLexer.lexBoost
     }
 
+    // "+" indicates term presence is required
+    // checking for length to ensure that only
+    // leading "+" are considered
+    if (char == "+" && lexer.width() === 1) {
+      lexer.emit(lunr.QueryLexer.PRESENCE)
+      return lunr.QueryLexer.lexText
+    }
+
+    // "-" indicates term presence is prohibited
+    // checking for length to ensure that only
+    // leading "-" are considered
+    if (char == "-" && lexer.width() === 1) {
+      lexer.emit(lunr.QueryLexer.PRESENCE)
+      return lunr.QueryLexer.lexText
+    }
+
     if (char.match(lunr.QueryLexer.termSeparator)) {
       return lunr.QueryLexer.lexTerm
     }
@@ -2759,7 +3200,7 @@ lunr.QueryParser.prototype.parse = function () {
   this.lexer.run()
   this.lexemes = this.lexer.lexemes
 
-  var state = lunr.QueryParser.parseFieldOrTerm
+  var state = lunr.QueryParser.parseClause
 
   while (state) {
     state = state(this)
@@ -2784,7 +3225,7 @@ lunr.QueryParser.prototype.nextClause = function () {
   this.currentClause = {}
 }
 
-lunr.QueryParser.parseFieldOrTerm = function (parser) {
+lunr.QueryParser.parseClause = function (parser) {
   var lexeme = parser.peekLexeme()
 
   if (lexeme == undefined) {
@@ -2792,6 +3233,8 @@ lunr.QueryParser.parseFieldOrTerm = function (parser) {
   }
 
   switch (lexeme.type) {
+    case lunr.QueryLexer.PRESENCE:
+      return lunr.QueryParser.parsePresence
     case lunr.QueryLexer.FIELD:
       return lunr.QueryParser.parseField
     case lunr.QueryLexer.TERM:
@@ -2807,6 +3250,43 @@ lunr.QueryParser.parseFieldOrTerm = function (parser) {
   }
 }
 
+lunr.QueryParser.parsePresence = function (parser) {
+  var lexeme = parser.consumeLexeme()
+
+  if (lexeme == undefined) {
+    return
+  }
+
+  switch (lexeme.str) {
+    case "-":
+      parser.currentClause.presence = lunr.Query.presence.PROHIBITED
+      break
+    case "+":
+      parser.currentClause.presence = lunr.Query.presence.REQUIRED
+      break
+    default:
+      var errorMessage = "unrecognised presence operator'" + lexeme.str + "'"
+      throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)
+  }
+
+  var nextLexeme = parser.peekLexeme()
+
+  if (nextLexeme == undefined) {
+    var errorMessage = "expecting term or field, found nothing"
+    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)
+  }
+
+  switch (nextLexeme.type) {
+    case lunr.QueryLexer.FIELD:
+      return lunr.QueryParser.parseField
+    case lunr.QueryLexer.TERM:
+      return lunr.QueryParser.parseTerm
+    default:
+      var errorMessage = "expecting term or field, found '" + nextLexeme.type + "'"
+      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)
+  }
+}
+
 lunr.QueryParser.parseField = function (parser) {
   var lexeme = parser.consumeLexeme()
 
@@ -2870,6 +3350,9 @@ lunr.QueryParser.parseTerm = function (parser) {
       return lunr.QueryParser.parseEditDistance
     case lunr.QueryLexer.BOOST:
       return lunr.QueryParser.parseBoost
+    case lunr.QueryLexer.PRESENCE:
+      parser.nextClause()
+      return lunr.QueryParser.parsePresence
     default:
       var errorMessage = "Unexpected lexeme type '" + nextLexeme.type + "'"
       throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)
@@ -2910,6 +3393,9 @@ lunr.QueryParser.parseEditDistance = function (parser) {
       return lunr.QueryParser.parseEditDistance
     case lunr.QueryLexer.BOOST:
       return lunr.QueryParser.parseBoost
+    case lunr.QueryLexer.PRESENCE:
+      parser.nextClause()
+      return lunr.QueryParser.parsePresence
     default:
       var errorMessage = "Unexpected lexeme type '" + nextLexeme.type + "'"
       throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)
@@ -2950,6 +3436,9 @@ lunr.QueryParser.parseBoost = function (parser) {
       return lunr.QueryParser.parseEditDistance
     case lunr.QueryLexer.BOOST:
       return lunr.QueryParser.parseBoost
+    case lunr.QueryLexer.PRESENCE:
+      parser.nextClause()
+      return lunr.QueryParser.parsePresence
     default:
       var errorMessage = "Unexpected lexeme type '" + nextLexeme.type + "'"
       throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)
diff --git a/search/search_index.json b/search/search_index.json
index 8661ca03..c92a0424 100644
--- a/search/search_index.json
+++ b/search/search_index.json
@@ -1 +1 @@
-{"config":{"lang":["en"],"prebuild_index":false,"separator":"[\\s\\-]+"},"docs":[{"location":"","text":"Introduction WebSocket is a computer communications protocol, providing full-duplex and bi-directionnal communication channels over a single TCP connection. IXWebSocket is a C++ library for client and server Websocket communication, and for client and server HTTP communication. TLS aka SSL is supported. The code is derived from easywsclient and from the Satori C SDK . It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD Example code // Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); Why another library? There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server. Contributing IXWebSocket is developed on GitHub . We'd love to hear about how you use it; opening up an issue on GitHub is ok for that. If things don't work as expected, please create an issue on GitHub, or even better a pull request if you know how to fix your problem.","title":"Home"},{"location":"#introduction","text":"WebSocket is a computer communications protocol, providing full-duplex and bi-directionnal communication channels over a single TCP connection. IXWebSocket is a C++ library for client and server Websocket communication, and for client and server HTTP communication. TLS aka SSL is supported. The code is derived from easywsclient and from the Satori C SDK . It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD","title":"Introduction"},{"location":"#example-code","text":"// Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\");","title":"Example code"},{"location":"#why-another-library","text":"There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server.","title":"Why another library?"},{"location":"#contributing","text":"IXWebSocket is developed on GitHub . We'd love to hear about how you use it; opening up an issue on GitHub is ok for that. If things don't work as expected, please create an issue on GitHub, or even better a pull request if you know how to fix your problem.","title":"Contributing"},{"location":"CHANGELOG/","text":"Changelog All changes to this project will be documented in this file. [8.0.7] - 2020-02-12 (build) remove the unused subtree which was causing some way of installing to break [8.0.6] - 2020-01-31 (snake) add an option to disable answering pongs as response to pings, to test cobra client behavior with hanged connections [8.0.5] - 2020-01-31 (IXCobraConnection) set a ping timeout of 90 seconds. If no pong messages are received as responses to ping for a while, give up and close the connection [8.0.4] - 2020-01-31 (cobra to sentry) remove noisy logging [8.0.3] - 2020-01-30 (ixcobra) check if we are authenticated in publishNext before trying to publish a message [8.0.2] - 2020-01-28 Extract severity level when emitting messages to sentry [8.0.1] - 2020-01-28 Fix bug #151 - If a socket connection is interrupted, calling stop() on the IXWebSocket object blocks until the next retry [8.0.0] - 2020-01-26 (SocketServer) add ability to bind on an ipv6 address [7.9.6] - 2020-01-22 (ws) add a dnslookup sub-command, to get the ip address of a remote host [7.9.5] - 2020-01-14 (windows) fix #144, get rid of stubbed/un-implemented windows schannel ssl backend [7.9.4] - 2020-01-12 (openssl + mbedssl) fix #140, can send large files with ws send over ssl / still broken with apple ssl [7.9.3] - 2020-01-10 (apple ssl) model write method after the OpenSSL one for consistency [7.9.2] - 2020-01-06 (apple ssl) unify read and write ssl utility code [7.9.1] - 2020-01-06 (websocket client) better error propagation when errors are detected while sending data (ws send) detect failures to send big files, terminate in those cases and report error [7.9.0] - 2020-01-04 (ws send) add option (-x) to disable per message deflate compression [7.8.9] - 2020-01-04 (ws send + receive) handle all message types (ping + pong + fragment) / investigate #140 [7.8.8] - 2019-12-28 (mbedtls) fix related to private key file parsing and initialization [7.8.6] - 2019-12-28 (ws cobra to sentry/statsd) fix for handling null events properly for empty queues + use queue to send data to statsd [7.8.5] - 2019-12-28 (ws cobra to sentry) handle null events for empty queues [7.8.4] - 2019-12-27 (ws cobra to sentry) game is picked in a fair manner, so that all games get the same share of sent events [7.8.3] - 2019-12-27 (ws cobra to sentry) refactor queue related code into a class [7.8.2] - 2019-12-25 (ws cobra to sentry) bound the queue size used to hold up cobra messages before they are sent to sentry. Default queue size is a 100 messages. Without such limit the program runs out of memory when a subscriber receive a lot of messages that cannot make it to sentry [7.8.1] - 2019-12-25 (ws client) use correct compilation defines so that spdlog is not used as a header only library (reduce binary size and increase compilation speed) [7.8.0] - 2019-12-24 (ws client) all commands use spdlog instead of std::cerr or std::cout for logging [7.6.5] - 2019-12-24 (cobra client) send a websocket ping every 30s to keep the connection opened [7.6.4] - 2019-12-22 (client) error handling, quote url in error case when failing to parse one (ws) ws_cobra_publish: register callbacks before connecting (doc) mention mbedtls in supported ssl server backend [7.6.3] - 2019-12-20 (tls) add a simple description of the TLS configuration routine for debugging [7.6.2] - 2019-12-20 (mbedtls) correct support for using own certificate and private key [7.6.1] - 2019-12-20 (ws commands) in websocket proxy, disable automatic reconnections + in Dockerfile, use alpine 3.11 [7.6.0] - 2019-12-19 (cobra) Add TLS options to all cobra commands and classes. Add example to the doc. [7.5.8] - 2019-12-18 (cobra-to-sentry) capture application version from device field [7.5.7] - 2019-12-18 (tls) Experimental TLS server support with mbedtls (windows) + process cert tlsoption (client + server) [7.5.6] - 2019-12-18 (tls servers) Make it clear that apple ssl and mbedtls backends do not support SSL in server mode [7.5.5] - 2019-12-17 (tls options client) TLSOptions struct _validated member should be initialized to false [7.5.4] - 2019-12-16 (websocket client) improve the error message when connecting to a non websocket server Before: Connection error: Got bad status connecting to example.com:443, status: 200, HTTP Status line: HTTP/1.1 200 OK After: Connection error: Expecting status 101 (Switching Protocol), got 200 status connecting to example.com:443, HTTP Status line: HTTP/1.1 200 OK [7.5.3] - 2019-12-12 (server) attempt at fixing #131 by using blocking writes in server mode [7.5.2] - 2019-12-11 (ws) cobra to sentry - created events with sentry tags based on tags present in the cobra messages [7.5.1] - 2019-12-06 (mac) convert SSL errors to utf8 [7.5.0] - 2019-12-05 (ws) cobra to sentry. Handle Error 429 Too Many Requests and politely wait before sending more data to sentry. In the example below sentry we are sending data too fast, sentry asks us to slow down which we do. Notice how the sent count stop increasing, while we are waiting for 41 seconds. [2019-12-05 15:50:33.759] [info] messages received 2449 sent 3 [2019-12-05 15:50:34.759] [info] messages received 5533 sent 7 [2019-12-05 15:50:35.759] [info] messages received 8612 sent 11 [2019-12-05 15:50:36.759] [info] messages received 11562 sent 15 [2019-12-05 15:50:37.759] [info] messages received 14410 sent 19 [2019-12-05 15:50:38.759] [info] messages received 17236 sent 23 [2019-12-05 15:50:39.282] [error] Error sending data to sentry: 429 [2019-12-05 15:50:39.282] [error] Body: {\"exception\":[{\"stacktrace\":{\"frames\":[{\"filename\":\"WorldScene.lua\",\"function\":\"WorldScene.lua:1935\",\"lineno\":1958},{\"filename\":\"WorldScene.lua\",\"function\":\"onUpdate_WorldCam\",\"lineno\":1921},{\"filename\":\"WorldMapTile.lua\",\"function\":\"__index\",\"lineno\":239}]},\"value\":\"noisytypes: Attempt to call nil(nil,2224139838)!\"}],\"platform\":\"python\",\"sdk\":{\"name\":\"ws\",\"version\":\"1.0.0\"},\"tags\":[[\"game\",\"niso\"],[\"userid\",\"107638363\"],[\"environment\",\"live\"]],\"timestamp\":\"2019-12-05T23:50:39Z\"} [2019-12-05 15:50:39.282] [error] Response: {\"error_name\":\"rate_limit\",\"error\":\"Creation of this event was denied due to rate limiting\"} [2019-12-05 15:50:39.282] [warning] Error 429 - Too Many Requests. ws will sleep and retry after 41 seconds [2019-12-05 15:50:39.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:40.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:41.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:42.761] [info] messages received 18839 sent 25 [2019-12-05 15:50:43.762] [info] messages received 18839 sent 25 [2019-12-05 15:50:44.763] [info] messages received 18839 sent 25 [2019-12-05 15:50:45.768] [info] messages received 18839 sent 25 [7.4.5] - 2019-12-03 (ws) #125 / fix build problem when jsoncpp is not installed locally [7.4.4] - 2019-12-03 (ws) #125 / cmake detects an already installed jsoncpp and will try to use this one if present [7.4.3] - 2019-12-03 (http client) use std::unordered_map instead of std::map for HttpParameters and HttpFormDataParameters class aliases [7.4.2] - 2019-12-02 (client) internal IXDNSLookup class requires a valid cancellation request function callback to be passed in [7.4.1] - 2019-12-02 (client) fix an overflow in the exponential back off code [7.4.0] - 2019-11-25 (http client) Add support for multipart HTTP POST upload (ixsentry) Add support for uploading a minidump to sentry [7.3.5] - 2019-11-20 On Darwin SSL, add ability to skip peer verification. [7.3.4] - 2019-11-20 32-bits compile fix, courtesy of @fcojavmc [7.3.1] - 2019-11-16 ws proxy_server / remote server close not forwarded to the client [7.3.0] - 2019-11-15 New ws command: ws proxy_server . [7.2.2] - 2019-11-01 Tag a release + minor reformating. [7.2.1] - 2019-10-26 Add unittest to IXSentryClient to lua backtrace parsing code [7.2.0] - 2019-10-24 Add cobra_metrics_to_redis sub-command to create streams for each cobra metric event being received. [7.1.0] - 2019-10-13 Add client support for websocket subprotocol. Look for the new addSubProtocol method for details. [7.0.0] - 2019-10-01 TLS support in server code, only implemented for the OpenSSL SSL backend for now. [6.3.4] - 2019-09-30 all ws subcommands propagate tls options to servers (unimplemented) or ws or http client (implemented) (contributed by Matt DeBoer) [6.3.3] - 2019-09-30 ws has a --version option [6.3.2] - 2019-09-29 (http + websocket clients) can specify cacert and some other tls options (not implemented on all backend). This makes it so that server certs can finally be validated on windows. [6.3.1] - 2019-09-29 Add ability to use OpenSSL on apple platforms. [6.3.0] - 2019-09-28 ixcobra / fix crash in CobraConnection::publishNext when the queue is empty + handle CobraConnection_PublishMode_Batch in CobraMetricsThreadedPublisher [6.2.9] - 2019-09-27 mbedtls fixes / the unittest now pass on macOS, and hopefully will on Windows/AppVeyor as well. [6.2.8] - 2019-09-26 Http server: add options to ws https to redirect all requests to a given url. POST requests will get a 200 and an empty response. ws httpd -L --redirect_url https://www.google.com [6.2.7] - 2019-09-25 Stop having ws send subcommand send a binary message in text mode, which would cause error in make ws_test shell script test. [6.2.6] - 2019-09-24 Fix 2 race conditions detected with TSan, one in CobraMetricsPublisher::push and another one in WebSocketTransport::sendData (that one was bad). [6.2.5] - 2019-09-23 Add simple Redis Server which is only capable of doing publish / subscribe. New ws redis_server sub-command to use it. The server is used in the unittest, so that we can run on CI in environment where redis isn not available like github actions env. [6.2.4] - 2019-09-22 Add options to configure TLS ; contributed by Matt DeBoer. Only implemented for OpenSSL TLS backend for now. [6.2.3] - 2019-09-21 Fix crash in the Linux unittest in the HTTP client code, in Socket::readBytes Cobra Metrics Publisher code returns the message id of the message that got published, to be used to validated that it got sent properly when receiving an ack. [6.2.2] - 2019-09-19 In DNS lookup code, make sure the weak pointer we use lives through the expected scope (if branch) [6.2.1] - 2019-09-17 On error while doing a client handshake, additionally display port number next to the host name [6.2.0] - 2019-09-09 websocket and http server: server does not close the bound client socket in many cases improve some websocket error messages add a utility function with unittest to parse status line and stop using scanf which triggers warnings on Windows update ws CLI11 (our command line argument parsing library) to the latest, which fix a compiler bug about optional [6.1.0] - 2019-09-08 move poll wrapper on top of select (only used on Windows) to the ix namespace [6.0.1] - 2019-09-05 add cobra metrics publisher + server unittest add cobra client + server unittest ws snake (cobra simple server) add basic support for unsubscription + subscribe send the proper subscription data + redis client subscription can be cancelled IXCobraConnection / pdu handlers can crash if they receive json data which is not an object [6.0.0] - 2019-09-04 all client autobahn test should pass ! zlib/deflate has a bug with windowsbits == 8, so we silently upgrade it to 9/ (fix autobahn test 13.X which uses 8 for the windows size) [5.2.0] - 2019-09-04 Fragmentation: for sent messages which are compressed, the continuation fragments should not have the rsv1 bit set (fix all autobahn tests for zlib compression 12.X) Websocket Server / do a case insensitive string search when looking for an Upgrade header whose value is websocket. (some client use WebSocket with some upper-case characters) [5.1.9] - 2019-09-03 ws autobahn / report progress with spdlog::info to get timing info ws autobahn / use condition variables for stopping test case + add more logging on errors [5.1.8] - 2019-09-03 Per message deflate/compression: handle fragmented messages (fix autobahn test: 12.1.X and probably others) [5.1.7] - 2019-09-03 Receiving invalid UTF-8 TEXT message should fail and close the connection (fix remaining autobahn test: 6.X UTF-8 Handling) [5.1.6] - 2019-09-03 Sending invalid UTF-8 TEXT message should fail and close the connection (fix remaining autobahn test: 6.X UTF-8 Handling) Fix failing unittest which was sending binary data in text mode with WebSocket::send to call properly call WebSocket::sendBinary instead. Validate that the reason is proper utf-8. (fix autobahn test 7.5.1) Validate close codes. Autobahn 7.9.* [5.1.5] - 2019-09-03 Framentation: data and continuation blocks received out of order (fix autobahn test: 5.9 through 5.20 Fragmentation) [5.1.4] - 2019-09-03 Sending invalid UTF-8 TEXT message should fail and close the connection (fix tons of autobahn test: 6.X UTF-8 Handling) [5.1.3] - 2019-09-03 Message type (TEXT or BINARY) is invalid for received fragmented messages (fix autobahn test: 5.3 through 5.8 Fragmentation) [5.1.2] - 2019-09-02 Ping and Pong messages cannot be fragmented (fix autobahn test: 5.1 and 5.2 Fragmentation) [5.1.1] - 2019-09-01 Close connections when reserved bits are used (fix autobahn test: 3.X Reserved Bits) [5.1.0] - 2019-08-31 ws autobahn / Add code to test websocket client compliance with the autobahn test-suite add utf-8 validation code, not hooked up properly yet Ping received with a payload too large (> 125 bytes) trigger a connection closure cobra / add tracking about published messages cobra / publish returns a message id, that can be used when cobra / new message type in the message received handler when publish/ok is received (can be used to implement an ack system). [5.0.9] - 2019-08-30 User-Agent header is set when not specified. New option to cap the max wait between reconnection attempts. Still default to 10s. (setMaxWaitBetweenReconnectionRetries). ws connect --max_wait 5000 ws://example.com # will only wait 5 seconds max between reconnection attempts [5.0.7] - 2019-08-23 WebSocket: add new option to pass in extra HTTP headers when connecting. ws connect add new option (-H, works like curl ) to pass in extra HTTP headers when connecting If you run against ws echo_server you will see the headers being received printed in the terminal. ws connect -H \"foo: bar\" -H \"baz: buz\" ws://127.0.0.1:8008 CobraConnection: sets a unique id field for all messages sent to cobra . CobraConnection: sets a counter as a field for each event published. [5.0.6] - 2019-08-22 Windows: silly compile error (poll should be in the global namespace) [5.0.5] - 2019-08-22 Windows: use select instead of WSAPoll, through a poll wrapper [5.0.4] - 2019-08-20 Windows build fixes (there was a problem with the use of ::poll that has a different name on Windows (WSAPoll)) [5.0.3] - 2019-08-14 CobraMetricThreadedPublisher _enable flag is an atomic, and CobraMetricsPublisher is enabled by default [5.0.2] - 2019-08-01 ws cobra_subscribe has a new -q (quiet) option ws cobra_subscribe knows to and display msg stats (count and # of messages received per second) ws cobra_subscribe, cobra_to_statsd and cobra_to_sentry commands have a new option, --filter to restrict the events they want to receive [5.0.1] - 2019-07-25 ws connect command has a new option to send in binary mode (still default to text) ws connect command has readline history thanks to libnoise-cpp. Now ws connect one can use using arrows to lookup previous sent messages and edit them [5.0.0] - 2019-06-23 Changed New HTTP server / still very early. ws gained a new command, httpd can run a simple webserver serving local files. IXDNSLookup. Uses weak pointer + smart_ptr + shared_from_this instead of static sets + mutex to handle object going away before dns lookup has resolved cobra_to_sentry / backtraces are reversed and line number is not extracted correctly mbedtls and zlib are searched with find_package, and we use the vendored version if nothing is found travis CI uses g++ on Linux [4.0.0] - 2019-06-09 Changed WebSocket::send() sends message in TEXT mode by default WebSocketMessage sets a new binary field, which tells whether the received incoming message is binary or text WebSocket::send takes a third arg, binary which default to true (can be text too) WebSocket callback only take one object, a const ix::WebSocketMessagePtr& msg Add explicit WebSocket::sendBinary method New headers + WebSocketMessage class to hold message data, still not used across the board Add test/compatibility folder with small servers and clients written in different languages and different libraries to test compatibility. ws echo_server has a -g option to print a greeting message on connect IXSocketMbedTLS: better error handling in close and connect [3.1.2] - 2019-06-06 Added ws connect has a -x option to disable per message deflate Add WebSocket::disablePerMessageDeflate() option. [3.0.0] - 2019-06-xx Changed TLS, aka SSL works on Windows (websocket and http clients) ws command line tool build on Windows Async API for HttpClient HttpClient API changed to use shared_ptr for response and request","title":"Changelog"},{"location":"CHANGELOG/#changelog","text":"All changes to this project will be documented in this file.","title":"Changelog"},{"location":"CHANGELOG/#807-2020-02-12","text":"(build) remove the unused subtree which was causing some way of installing to break","title":"[8.0.7] - 2020-02-12"},{"location":"CHANGELOG/#806-2020-01-31","text":"(snake) add an option to disable answering pongs as response to pings, to test cobra client behavior with hanged connections","title":"[8.0.6] - 2020-01-31"},{"location":"CHANGELOG/#805-2020-01-31","text":"(IXCobraConnection) set a ping timeout of 90 seconds. If no pong messages are received as responses to ping for a while, give up and close the connection","title":"[8.0.5] - 2020-01-31"},{"location":"CHANGELOG/#804-2020-01-31","text":"(cobra to sentry) remove noisy logging","title":"[8.0.4] - 2020-01-31"},{"location":"CHANGELOG/#803-2020-01-30","text":"(ixcobra) check if we are authenticated in publishNext before trying to publish a message","title":"[8.0.3] - 2020-01-30"},{"location":"CHANGELOG/#802-2020-01-28","text":"Extract severity level when emitting messages to sentry","title":"[8.0.2] - 2020-01-28"},{"location":"CHANGELOG/#801-2020-01-28","text":"Fix bug #151 - If a socket connection is interrupted, calling stop() on the IXWebSocket object blocks until the next retry","title":"[8.0.1] - 2020-01-28"},{"location":"CHANGELOG/#800-2020-01-26","text":"(SocketServer) add ability to bind on an ipv6 address","title":"[8.0.0] - 2020-01-26"},{"location":"CHANGELOG/#796-2020-01-22","text":"(ws) add a dnslookup sub-command, to get the ip address of a remote host","title":"[7.9.6] - 2020-01-22"},{"location":"CHANGELOG/#795-2020-01-14","text":"(windows) fix #144, get rid of stubbed/un-implemented windows schannel ssl backend","title":"[7.9.5] - 2020-01-14"},{"location":"CHANGELOG/#794-2020-01-12","text":"(openssl + mbedssl) fix #140, can send large files with ws send over ssl / still broken with apple ssl","title":"[7.9.4] - 2020-01-12"},{"location":"CHANGELOG/#793-2020-01-10","text":"(apple ssl) model write method after the OpenSSL one for consistency","title":"[7.9.3] - 2020-01-10"},{"location":"CHANGELOG/#792-2020-01-06","text":"(apple ssl) unify read and write ssl utility code","title":"[7.9.2] - 2020-01-06"},{"location":"CHANGELOG/#791-2020-01-06","text":"(websocket client) better error propagation when errors are detected while sending data (ws send) detect failures to send big files, terminate in those cases and report error","title":"[7.9.1] - 2020-01-06"},{"location":"CHANGELOG/#790-2020-01-04","text":"(ws send) add option (-x) to disable per message deflate compression","title":"[7.9.0] - 2020-01-04"},{"location":"CHANGELOG/#789-2020-01-04","text":"(ws send + receive) handle all message types (ping + pong + fragment) / investigate #140","title":"[7.8.9] - 2020-01-04"},{"location":"CHANGELOG/#788-2019-12-28","text":"(mbedtls) fix related to private key file parsing and initialization","title":"[7.8.8] - 2019-12-28"},{"location":"CHANGELOG/#786-2019-12-28","text":"(ws cobra to sentry/statsd) fix for handling null events properly for empty queues + use queue to send data to statsd","title":"[7.8.6] - 2019-12-28"},{"location":"CHANGELOG/#785-2019-12-28","text":"(ws cobra to sentry) handle null events for empty queues","title":"[7.8.5] - 2019-12-28"},{"location":"CHANGELOG/#784-2019-12-27","text":"(ws cobra to sentry) game is picked in a fair manner, so that all games get the same share of sent events","title":"[7.8.4] - 2019-12-27"},{"location":"CHANGELOG/#783-2019-12-27","text":"(ws cobra to sentry) refactor queue related code into a class","title":"[7.8.3] - 2019-12-27"},{"location":"CHANGELOG/#782-2019-12-25","text":"(ws cobra to sentry) bound the queue size used to hold up cobra messages before they are sent to sentry. Default queue size is a 100 messages. Without such limit the program runs out of memory when a subscriber receive a lot of messages that cannot make it to sentry","title":"[7.8.2] - 2019-12-25"},{"location":"CHANGELOG/#781-2019-12-25","text":"(ws client) use correct compilation defines so that spdlog is not used as a header only library (reduce binary size and increase compilation speed)","title":"[7.8.1] - 2019-12-25"},{"location":"CHANGELOG/#780-2019-12-24","text":"(ws client) all commands use spdlog instead of std::cerr or std::cout for logging","title":"[7.8.0] - 2019-12-24"},{"location":"CHANGELOG/#765-2019-12-24","text":"(cobra client) send a websocket ping every 30s to keep the connection opened","title":"[7.6.5] - 2019-12-24"},{"location":"CHANGELOG/#764-2019-12-22","text":"(client) error handling, quote url in error case when failing to parse one (ws) ws_cobra_publish: register callbacks before connecting (doc) mention mbedtls in supported ssl server backend","title":"[7.6.4] - 2019-12-22"},{"location":"CHANGELOG/#763-2019-12-20","text":"(tls) add a simple description of the TLS configuration routine for debugging","title":"[7.6.3] - 2019-12-20"},{"location":"CHANGELOG/#762-2019-12-20","text":"(mbedtls) correct support for using own certificate and private key","title":"[7.6.2] - 2019-12-20"},{"location":"CHANGELOG/#761-2019-12-20","text":"(ws commands) in websocket proxy, disable automatic reconnections + in Dockerfile, use alpine 3.11","title":"[7.6.1] - 2019-12-20"},{"location":"CHANGELOG/#760-2019-12-19","text":"(cobra) Add TLS options to all cobra commands and classes. Add example to the doc.","title":"[7.6.0] - 2019-12-19"},{"location":"CHANGELOG/#758-2019-12-18","text":"(cobra-to-sentry) capture application version from device field","title":"[7.5.8] - 2019-12-18"},{"location":"CHANGELOG/#757-2019-12-18","text":"(tls) Experimental TLS server support with mbedtls (windows) + process cert tlsoption (client + server)","title":"[7.5.7] - 2019-12-18"},{"location":"CHANGELOG/#756-2019-12-18","text":"(tls servers) Make it clear that apple ssl and mbedtls backends do not support SSL in server mode","title":"[7.5.6] - 2019-12-18"},{"location":"CHANGELOG/#755-2019-12-17","text":"(tls options client) TLSOptions struct _validated member should be initialized to false","title":"[7.5.5] - 2019-12-17"},{"location":"CHANGELOG/#754-2019-12-16","text":"(websocket client) improve the error message when connecting to a non websocket server Before: Connection error: Got bad status connecting to example.com:443, status: 200, HTTP Status line: HTTP/1.1 200 OK After: Connection error: Expecting status 101 (Switching Protocol), got 200 status connecting to example.com:443, HTTP Status line: HTTP/1.1 200 OK","title":"[7.5.4] - 2019-12-16"},{"location":"CHANGELOG/#753-2019-12-12","text":"(server) attempt at fixing #131 by using blocking writes in server mode","title":"[7.5.3] - 2019-12-12"},{"location":"CHANGELOG/#752-2019-12-11","text":"(ws) cobra to sentry - created events with sentry tags based on tags present in the cobra messages","title":"[7.5.2] - 2019-12-11"},{"location":"CHANGELOG/#751-2019-12-06","text":"(mac) convert SSL errors to utf8","title":"[7.5.1] - 2019-12-06"},{"location":"CHANGELOG/#750-2019-12-05","text":"(ws) cobra to sentry. Handle Error 429 Too Many Requests and politely wait before sending more data to sentry. In the example below sentry we are sending data too fast, sentry asks us to slow down which we do. Notice how the sent count stop increasing, while we are waiting for 41 seconds. [2019-12-05 15:50:33.759] [info] messages received 2449 sent 3 [2019-12-05 15:50:34.759] [info] messages received 5533 sent 7 [2019-12-05 15:50:35.759] [info] messages received 8612 sent 11 [2019-12-05 15:50:36.759] [info] messages received 11562 sent 15 [2019-12-05 15:50:37.759] [info] messages received 14410 sent 19 [2019-12-05 15:50:38.759] [info] messages received 17236 sent 23 [2019-12-05 15:50:39.282] [error] Error sending data to sentry: 429 [2019-12-05 15:50:39.282] [error] Body: {\"exception\":[{\"stacktrace\":{\"frames\":[{\"filename\":\"WorldScene.lua\",\"function\":\"WorldScene.lua:1935\",\"lineno\":1958},{\"filename\":\"WorldScene.lua\",\"function\":\"onUpdate_WorldCam\",\"lineno\":1921},{\"filename\":\"WorldMapTile.lua\",\"function\":\"__index\",\"lineno\":239}]},\"value\":\"noisytypes: Attempt to call nil(nil,2224139838)!\"}],\"platform\":\"python\",\"sdk\":{\"name\":\"ws\",\"version\":\"1.0.0\"},\"tags\":[[\"game\",\"niso\"],[\"userid\",\"107638363\"],[\"environment\",\"live\"]],\"timestamp\":\"2019-12-05T23:50:39Z\"} [2019-12-05 15:50:39.282] [error] Response: {\"error_name\":\"rate_limit\",\"error\":\"Creation of this event was denied due to rate limiting\"} [2019-12-05 15:50:39.282] [warning] Error 429 - Too Many Requests. ws will sleep and retry after 41 seconds [2019-12-05 15:50:39.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:40.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:41.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:42.761] [info] messages received 18839 sent 25 [2019-12-05 15:50:43.762] [info] messages received 18839 sent 25 [2019-12-05 15:50:44.763] [info] messages received 18839 sent 25 [2019-12-05 15:50:45.768] [info] messages received 18839 sent 25","title":"[7.5.0] - 2019-12-05"},{"location":"CHANGELOG/#745-2019-12-03","text":"(ws) #125 / fix build problem when jsoncpp is not installed locally","title":"[7.4.5] - 2019-12-03"},{"location":"CHANGELOG/#744-2019-12-03","text":"(ws) #125 / cmake detects an already installed jsoncpp and will try to use this one if present","title":"[7.4.4] - 2019-12-03"},{"location":"CHANGELOG/#743-2019-12-03","text":"(http client) use std::unordered_map instead of std::map for HttpParameters and HttpFormDataParameters class aliases","title":"[7.4.3] - 2019-12-03"},{"location":"CHANGELOG/#742-2019-12-02","text":"(client) internal IXDNSLookup class requires a valid cancellation request function callback to be passed in","title":"[7.4.2] - 2019-12-02"},{"location":"CHANGELOG/#741-2019-12-02","text":"(client) fix an overflow in the exponential back off code","title":"[7.4.1] - 2019-12-02"},{"location":"CHANGELOG/#740-2019-11-25","text":"(http client) Add support for multipart HTTP POST upload (ixsentry) Add support for uploading a minidump to sentry","title":"[7.4.0] - 2019-11-25"},{"location":"CHANGELOG/#735-2019-11-20","text":"On Darwin SSL, add ability to skip peer verification.","title":"[7.3.5] - 2019-11-20"},{"location":"CHANGELOG/#734-2019-11-20","text":"32-bits compile fix, courtesy of @fcojavmc","title":"[7.3.4] - 2019-11-20"},{"location":"CHANGELOG/#731-2019-11-16","text":"ws proxy_server / remote server close not forwarded to the client","title":"[7.3.1] - 2019-11-16"},{"location":"CHANGELOG/#730-2019-11-15","text":"New ws command: ws proxy_server .","title":"[7.3.0] - 2019-11-15"},{"location":"CHANGELOG/#722-2019-11-01","text":"Tag a release + minor reformating.","title":"[7.2.2] - 2019-11-01"},{"location":"CHANGELOG/#721-2019-10-26","text":"Add unittest to IXSentryClient to lua backtrace parsing code","title":"[7.2.1] - 2019-10-26"},{"location":"CHANGELOG/#720-2019-10-24","text":"Add cobra_metrics_to_redis sub-command to create streams for each cobra metric event being received.","title":"[7.2.0] - 2019-10-24"},{"location":"CHANGELOG/#710-2019-10-13","text":"Add client support for websocket subprotocol. Look for the new addSubProtocol method for details.","title":"[7.1.0] - 2019-10-13"},{"location":"CHANGELOG/#700-2019-10-01","text":"TLS support in server code, only implemented for the OpenSSL SSL backend for now.","title":"[7.0.0] - 2019-10-01"},{"location":"CHANGELOG/#634-2019-09-30","text":"all ws subcommands propagate tls options to servers (unimplemented) or ws or http client (implemented) (contributed by Matt DeBoer)","title":"[6.3.4] - 2019-09-30"},{"location":"CHANGELOG/#633-2019-09-30","text":"ws has a --version option","title":"[6.3.3] - 2019-09-30"},{"location":"CHANGELOG/#632-2019-09-29","text":"(http + websocket clients) can specify cacert and some other tls options (not implemented on all backend). This makes it so that server certs can finally be validated on windows.","title":"[6.3.2] - 2019-09-29"},{"location":"CHANGELOG/#631-2019-09-29","text":"Add ability to use OpenSSL on apple platforms.","title":"[6.3.1] - 2019-09-29"},{"location":"CHANGELOG/#630-2019-09-28","text":"ixcobra / fix crash in CobraConnection::publishNext when the queue is empty + handle CobraConnection_PublishMode_Batch in CobraMetricsThreadedPublisher","title":"[6.3.0] - 2019-09-28"},{"location":"CHANGELOG/#629-2019-09-27","text":"mbedtls fixes / the unittest now pass on macOS, and hopefully will on Windows/AppVeyor as well.","title":"[6.2.9] - 2019-09-27"},{"location":"CHANGELOG/#628-2019-09-26","text":"Http server: add options to ws https to redirect all requests to a given url. POST requests will get a 200 and an empty response. ws httpd -L --redirect_url https://www.google.com","title":"[6.2.8] - 2019-09-26"},{"location":"CHANGELOG/#627-2019-09-25","text":"Stop having ws send subcommand send a binary message in text mode, which would cause error in make ws_test shell script test.","title":"[6.2.7] - 2019-09-25"},{"location":"CHANGELOG/#626-2019-09-24","text":"Fix 2 race conditions detected with TSan, one in CobraMetricsPublisher::push and another one in WebSocketTransport::sendData (that one was bad).","title":"[6.2.6] - 2019-09-24"},{"location":"CHANGELOG/#625-2019-09-23","text":"Add simple Redis Server which is only capable of doing publish / subscribe. New ws redis_server sub-command to use it. The server is used in the unittest, so that we can run on CI in environment where redis isn not available like github actions env.","title":"[6.2.5] - 2019-09-23"},{"location":"CHANGELOG/#624-2019-09-22","text":"Add options to configure TLS ; contributed by Matt DeBoer. Only implemented for OpenSSL TLS backend for now.","title":"[6.2.4] - 2019-09-22"},{"location":"CHANGELOG/#623-2019-09-21","text":"Fix crash in the Linux unittest in the HTTP client code, in Socket::readBytes Cobra Metrics Publisher code returns the message id of the message that got published, to be used to validated that it got sent properly when receiving an ack.","title":"[6.2.3] - 2019-09-21"},{"location":"CHANGELOG/#622-2019-09-19","text":"In DNS lookup code, make sure the weak pointer we use lives through the expected scope (if branch)","title":"[6.2.2] - 2019-09-19"},{"location":"CHANGELOG/#621-2019-09-17","text":"On error while doing a client handshake, additionally display port number next to the host name","title":"[6.2.1] - 2019-09-17"},{"location":"CHANGELOG/#620-2019-09-09","text":"websocket and http server: server does not close the bound client socket in many cases improve some websocket error messages add a utility function with unittest to parse status line and stop using scanf which triggers warnings on Windows update ws CLI11 (our command line argument parsing library) to the latest, which fix a compiler bug about optional","title":"[6.2.0] - 2019-09-09"},{"location":"CHANGELOG/#610-2019-09-08","text":"move poll wrapper on top of select (only used on Windows) to the ix namespace","title":"[6.1.0] - 2019-09-08"},{"location":"CHANGELOG/#601-2019-09-05","text":"add cobra metrics publisher + server unittest add cobra client + server unittest ws snake (cobra simple server) add basic support for unsubscription + subscribe send the proper subscription data + redis client subscription can be cancelled IXCobraConnection / pdu handlers can crash if they receive json data which is not an object","title":"[6.0.1] - 2019-09-05"},{"location":"CHANGELOG/#600-2019-09-04","text":"all client autobahn test should pass ! zlib/deflate has a bug with windowsbits == 8, so we silently upgrade it to 9/ (fix autobahn test 13.X which uses 8 for the windows size)","title":"[6.0.0] - 2019-09-04"},{"location":"CHANGELOG/#520-2019-09-04","text":"Fragmentation: for sent messages which are compressed, the continuation fragments should not have the rsv1 bit set (fix all autobahn tests for zlib compression 12.X) Websocket Server / do a case insensitive string search when looking for an Upgrade header whose value is websocket. (some client use WebSocket with some upper-case characters)","title":"[5.2.0] - 2019-09-04"},{"location":"CHANGELOG/#519-2019-09-03","text":"ws autobahn / report progress with spdlog::info to get timing info ws autobahn / use condition variables for stopping test case + add more logging on errors","title":"[5.1.9] - 2019-09-03"},{"location":"CHANGELOG/#518-2019-09-03","text":"Per message deflate/compression: handle fragmented messages (fix autobahn test: 12.1.X and probably others)","title":"[5.1.8] - 2019-09-03"},{"location":"CHANGELOG/#517-2019-09-03","text":"Receiving invalid UTF-8 TEXT message should fail and close the connection (fix remaining autobahn test: 6.X UTF-8 Handling)","title":"[5.1.7] - 2019-09-03"},{"location":"CHANGELOG/#516-2019-09-03","text":"Sending invalid UTF-8 TEXT message should fail and close the connection (fix remaining autobahn test: 6.X UTF-8 Handling) Fix failing unittest which was sending binary data in text mode with WebSocket::send to call properly call WebSocket::sendBinary instead. Validate that the reason is proper utf-8. (fix autobahn test 7.5.1) Validate close codes. Autobahn 7.9.*","title":"[5.1.6] - 2019-09-03"},{"location":"CHANGELOG/#515-2019-09-03","text":"Framentation: data and continuation blocks received out of order (fix autobahn test: 5.9 through 5.20 Fragmentation)","title":"[5.1.5] - 2019-09-03"},{"location":"CHANGELOG/#514-2019-09-03","text":"Sending invalid UTF-8 TEXT message should fail and close the connection (fix tons of autobahn test: 6.X UTF-8 Handling)","title":"[5.1.4] - 2019-09-03"},{"location":"CHANGELOG/#513-2019-09-03","text":"Message type (TEXT or BINARY) is invalid for received fragmented messages (fix autobahn test: 5.3 through 5.8 Fragmentation)","title":"[5.1.3] - 2019-09-03"},{"location":"CHANGELOG/#512-2019-09-02","text":"Ping and Pong messages cannot be fragmented (fix autobahn test: 5.1 and 5.2 Fragmentation)","title":"[5.1.2] - 2019-09-02"},{"location":"CHANGELOG/#511-2019-09-01","text":"Close connections when reserved bits are used (fix autobahn test: 3.X Reserved Bits)","title":"[5.1.1] - 2019-09-01"},{"location":"CHANGELOG/#510-2019-08-31","text":"ws autobahn / Add code to test websocket client compliance with the autobahn test-suite add utf-8 validation code, not hooked up properly yet Ping received with a payload too large (> 125 bytes) trigger a connection closure cobra / add tracking about published messages cobra / publish returns a message id, that can be used when cobra / new message type in the message received handler when publish/ok is received (can be used to implement an ack system).","title":"[5.1.0] - 2019-08-31"},{"location":"CHANGELOG/#509-2019-08-30","text":"User-Agent header is set when not specified. New option to cap the max wait between reconnection attempts. Still default to 10s. (setMaxWaitBetweenReconnectionRetries). ws connect --max_wait 5000 ws://example.com # will only wait 5 seconds max between reconnection attempts","title":"[5.0.9] - 2019-08-30"},{"location":"CHANGELOG/#507-2019-08-23","text":"WebSocket: add new option to pass in extra HTTP headers when connecting. ws connect add new option (-H, works like curl ) to pass in extra HTTP headers when connecting If you run against ws echo_server you will see the headers being received printed in the terminal. ws connect -H \"foo: bar\" -H \"baz: buz\" ws://127.0.0.1:8008 CobraConnection: sets a unique id field for all messages sent to cobra . CobraConnection: sets a counter as a field for each event published.","title":"[5.0.7] - 2019-08-23"},{"location":"CHANGELOG/#506-2019-08-22","text":"Windows: silly compile error (poll should be in the global namespace)","title":"[5.0.6] - 2019-08-22"},{"location":"CHANGELOG/#505-2019-08-22","text":"Windows: use select instead of WSAPoll, through a poll wrapper","title":"[5.0.5] - 2019-08-22"},{"location":"CHANGELOG/#504-2019-08-20","text":"Windows build fixes (there was a problem with the use of ::poll that has a different name on Windows (WSAPoll))","title":"[5.0.4] - 2019-08-20"},{"location":"CHANGELOG/#503-2019-08-14","text":"CobraMetricThreadedPublisher _enable flag is an atomic, and CobraMetricsPublisher is enabled by default","title":"[5.0.3] - 2019-08-14"},{"location":"CHANGELOG/#502-2019-08-01","text":"ws cobra_subscribe has a new -q (quiet) option ws cobra_subscribe knows to and display msg stats (count and # of messages received per second) ws cobra_subscribe, cobra_to_statsd and cobra_to_sentry commands have a new option, --filter to restrict the events they want to receive","title":"[5.0.2] - 2019-08-01"},{"location":"CHANGELOG/#501-2019-07-25","text":"ws connect command has a new option to send in binary mode (still default to text) ws connect command has readline history thanks to libnoise-cpp. Now ws connect one can use using arrows to lookup previous sent messages and edit them","title":"[5.0.1] - 2019-07-25"},{"location":"CHANGELOG/#500-2019-06-23","text":"","title":"[5.0.0] - 2019-06-23"},{"location":"CHANGELOG/#changed","text":"New HTTP server / still very early. ws gained a new command, httpd can run a simple webserver serving local files. IXDNSLookup. Uses weak pointer + smart_ptr + shared_from_this instead of static sets + mutex to handle object going away before dns lookup has resolved cobra_to_sentry / backtraces are reversed and line number is not extracted correctly mbedtls and zlib are searched with find_package, and we use the vendored version if nothing is found travis CI uses g++ on Linux","title":"Changed"},{"location":"CHANGELOG/#400-2019-06-09","text":"","title":"[4.0.0] - 2019-06-09"},{"location":"CHANGELOG/#changed_1","text":"WebSocket::send() sends message in TEXT mode by default WebSocketMessage sets a new binary field, which tells whether the received incoming message is binary or text WebSocket::send takes a third arg, binary which default to true (can be text too) WebSocket callback only take one object, a const ix::WebSocketMessagePtr& msg Add explicit WebSocket::sendBinary method New headers + WebSocketMessage class to hold message data, still not used across the board Add test/compatibility folder with small servers and clients written in different languages and different libraries to test compatibility. ws echo_server has a -g option to print a greeting message on connect IXSocketMbedTLS: better error handling in close and connect","title":"Changed"},{"location":"CHANGELOG/#312-2019-06-06","text":"","title":"[3.1.2] - 2019-06-06"},{"location":"CHANGELOG/#added","text":"ws connect has a -x option to disable per message deflate Add WebSocket::disablePerMessageDeflate() option.","title":"Added"},{"location":"CHANGELOG/#300-2019-06-xx","text":"","title":"[3.0.0] - 2019-06-xx"},{"location":"CHANGELOG/#changed_2","text":"TLS, aka SSL works on Windows (websocket and http clients) ws command line tool build on Windows Async API for HttpClient HttpClient API changed to use shared_ptr for response and request","title":"Changed"},{"location":"build/","text":"Build CMake CMakefiles for the library and the examples are available. This library has few dependencies, so it is possible to just add the source files into your project. Otherwise the usual way will suffice. mkdir build # make a build dir so that you can build out of tree. cd build cmake -DUSE_TLS=1 .. make -j make install # will install to /usr/local on Unix, on macOS it is a good idea to sudo chown -R `whoami`:staff /usr/local Headers and a static library will be installed to the target dir. There is a unittest which can be executed by typing make test . Options for building: -DUSE_TLS=1 will enable TLS support -DUSE_MBED_TLS=1 will use mbedlts for the TLS support (default on Windows) -DUSE_WS=1 will build the ws interactive command line tool If you are on Windows, look at the appveyor file that has instructions for building dependencies. It is also possible to externally include the project, so that everything is fetched over the wire when you build like so: ExternalProject_Add( IXWebSocket GIT_REPOSITORY https://github.com/machinezone/IXWebSocket.git ... ) vcpkg It is possible to get IXWebSocket through Microsoft vcpkg . vcpkg install ixwebsocket Conan Conan is currently supported through a recipe in Conan Center ( Bintray entry ). Package reference Conan 1.21.0 and up: ixwebsocket/7.9.2 Earlier versions: ixwebsocket/7.9.2@_/_ Note that the version listed here might not be the latest one. See Bintray or the recipe itself for the latest version. If you're migrating from the previous, custom Bintray remote, note that the package reference has to be lower-case. Docker There is a Dockerfile for running the unittest on Linux, and to run the ws tool. It is also available on the docker registry. docker run bsergean/ws To use docker-compose you must make a docker container first. $ make docker ... $ docker compose up & ... $ docker exec -it ixwebsocket_ws_1 bash app@ca2340eb9106:~$ ws --help ws is a websocket tool ...","title":"Build"},{"location":"build/#build","text":"","title":"Build"},{"location":"build/#cmake","text":"CMakefiles for the library and the examples are available. This library has few dependencies, so it is possible to just add the source files into your project. Otherwise the usual way will suffice. mkdir build # make a build dir so that you can build out of tree. cd build cmake -DUSE_TLS=1 .. make -j make install # will install to /usr/local on Unix, on macOS it is a good idea to sudo chown -R `whoami`:staff /usr/local Headers and a static library will be installed to the target dir. There is a unittest which can be executed by typing make test . Options for building: -DUSE_TLS=1 will enable TLS support -DUSE_MBED_TLS=1 will use mbedlts for the TLS support (default on Windows) -DUSE_WS=1 will build the ws interactive command line tool If you are on Windows, look at the appveyor file that has instructions for building dependencies. It is also possible to externally include the project, so that everything is fetched over the wire when you build like so: ExternalProject_Add( IXWebSocket GIT_REPOSITORY https://github.com/machinezone/IXWebSocket.git ... )","title":"CMake"},{"location":"build/#vcpkg","text":"It is possible to get IXWebSocket through Microsoft vcpkg . vcpkg install ixwebsocket","title":"vcpkg"},{"location":"build/#conan","text":"Conan is currently supported through a recipe in Conan Center ( Bintray entry ). Package reference Conan 1.21.0 and up: ixwebsocket/7.9.2 Earlier versions: ixwebsocket/7.9.2@_/_ Note that the version listed here might not be the latest one. See Bintray or the recipe itself for the latest version. If you're migrating from the previous, custom Bintray remote, note that the package reference has to be lower-case.","title":"Conan"},{"location":"build/#docker","text":"There is a Dockerfile for running the unittest on Linux, and to run the ws tool. It is also available on the docker registry. docker run bsergean/ws To use docker-compose you must make a docker container first. $ make docker ... $ docker compose up & ... $ docker exec -it ixwebsocket_ws_1 bash app@ca2340eb9106:~$ ws --help ws is a websocket tool ...","title":"Docker"},{"location":"cobra/","text":"General cobra is a real time messaging server. The ws utility can run a cobra server (named snake), and has client to publish and subscribe to a cobra server. Bring up 3 terminals and run a server, a publisher and a subscriber in each one. As you publish data you should see it being received by the subscriber. You can run redis-cli MONITOR too to see how redis is being used. Server You will need to have a redis server running locally. To run the server: $ cd <ixwebsocket-top-level-folder>/ixsnake/ixsnake $ ws snake { \"apps\": { \"FC2F10139A2BAc53BB72D9db967b024f\": { \"roles\": { \"_sub\": { \"secret\": \"66B1dA3ED5fA074EB5AE84Dd8CE3b5ba\" }, \"_pub\": { \"secret\": \"1c04DB8fFe76A4EeFE3E318C72d771db\" } } } } } redis host: 127.0.0.1 redis password: redis port: 6379 Publisher $ cd <ixwebsocket-top-level-folder>/ws $ ws cobra_publish --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel cobraMetricsSample.json [2019-11-27 09:06:12.980] [info] Publisher connected [2019-11-27 09:06:12.980] [info] Connection: Upgrade [2019-11-27 09:06:12.980] [info] Sec-WebSocket-Accept: zTtQKMKbvwjdivURplYXwCVUCWM= [2019-11-27 09:06:12.980] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-11-27 09:06:12.980] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11 [2019-11-27 09:06:12.980] [info] Upgrade: websocket [2019-11-27 09:06:12.982] [info] Publisher authenticated [2019-11-27 09:06:12.982] [info] Published msg 3 [2019-11-27 09:06:12.982] [info] Published message id 3 acked Subscriber $ ws cobra_subscribe --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel #messages 0 msg/s 0 [2019-11-27 09:07:39.341] [info] Subscriber connected [2019-11-27 09:07:39.341] [info] Connection: Upgrade [2019-11-27 09:07:39.341] [info] Sec-WebSocket-Accept: 9vkQWofz49qMCUlTSptCCwHWm+Q= [2019-11-27 09:07:39.341] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-11-27 09:07:39.341] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11 [2019-11-27 09:07:39.341] [info] Upgrade: websocket [2019-11-27 09:07:39.342] [info] Subscriber authenticated [2019-11-27 09:07:39.345] [info] Subscriber: subscribed to channel test_channel #messages 0 msg/s 0 #messages 0 msg/s 0 #messages 0 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} #messages 1 msg/s 1 #messages 1 msg/s 0 #messages 1 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} {\"baz\":123,\"foo\":\"bar\"} #messages 3 msg/s 2 #messages 3 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} #messages 4 msg/s 1 ^C","title":"Cobra"},{"location":"cobra/#general","text":"cobra is a real time messaging server. The ws utility can run a cobra server (named snake), and has client to publish and subscribe to a cobra server. Bring up 3 terminals and run a server, a publisher and a subscriber in each one. As you publish data you should see it being received by the subscriber. You can run redis-cli MONITOR too to see how redis is being used.","title":"General"},{"location":"cobra/#server","text":"You will need to have a redis server running locally. To run the server: $ cd <ixwebsocket-top-level-folder>/ixsnake/ixsnake $ ws snake { \"apps\": { \"FC2F10139A2BAc53BB72D9db967b024f\": { \"roles\": { \"_sub\": { \"secret\": \"66B1dA3ED5fA074EB5AE84Dd8CE3b5ba\" }, \"_pub\": { \"secret\": \"1c04DB8fFe76A4EeFE3E318C72d771db\" } } } } } redis host: 127.0.0.1 redis password: redis port: 6379","title":"Server"},{"location":"cobra/#publisher","text":"$ cd <ixwebsocket-top-level-folder>/ws $ ws cobra_publish --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel cobraMetricsSample.json [2019-11-27 09:06:12.980] [info] Publisher connected [2019-11-27 09:06:12.980] [info] Connection: Upgrade [2019-11-27 09:06:12.980] [info] Sec-WebSocket-Accept: zTtQKMKbvwjdivURplYXwCVUCWM= [2019-11-27 09:06:12.980] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-11-27 09:06:12.980] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11 [2019-11-27 09:06:12.980] [info] Upgrade: websocket [2019-11-27 09:06:12.982] [info] Publisher authenticated [2019-11-27 09:06:12.982] [info] Published msg 3 [2019-11-27 09:06:12.982] [info] Published message id 3 acked","title":"Publisher"},{"location":"cobra/#subscriber","text":"$ ws cobra_subscribe --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel #messages 0 msg/s 0 [2019-11-27 09:07:39.341] [info] Subscriber connected [2019-11-27 09:07:39.341] [info] Connection: Upgrade [2019-11-27 09:07:39.341] [info] Sec-WebSocket-Accept: 9vkQWofz49qMCUlTSptCCwHWm+Q= [2019-11-27 09:07:39.341] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-11-27 09:07:39.341] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11 [2019-11-27 09:07:39.341] [info] Upgrade: websocket [2019-11-27 09:07:39.342] [info] Subscriber authenticated [2019-11-27 09:07:39.345] [info] Subscriber: subscribed to channel test_channel #messages 0 msg/s 0 #messages 0 msg/s 0 #messages 0 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} #messages 1 msg/s 1 #messages 1 msg/s 0 #messages 1 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} {\"baz\":123,\"foo\":\"bar\"} #messages 3 msg/s 2 #messages 3 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} #messages 4 msg/s 1 ^C","title":"Subscriber"},{"location":"design/","text":"Implementation details Per Message Deflate compression. The per message deflate compression option is supported. It can lead to very nice bandbwith savings (20x !) if your messages are similar, which is often the case for example for chat applications. All features of the spec should be supported. TLS/SSL Connections can be optionally secured and encrypted with TLS/SSL when using a wss:// endpoint, or using normal un-encrypted socket with ws:// endpoints. AppleSSL is used on iOS and macOS, OpenSSL is used on Android and Linux, mbedTLS is used on Windows. Polling and background thread work No manual polling to fetch data is required. Data is sent and received instantly by using a background thread for receiving data and the select system call to be notified by the OS of incoming data. No timeout is used for select so that the background thread is only woken up when data is available, to optimize battery life. This is also the recommended way of using select according to the select tutorial, section select law . Read and Writes to the socket are non blocking. Data is sent right away and not enqueued by writing directly to the socket, which is possible since system socket implementations allow concurrent read/writes. However concurrent writes need to be protected with mutex. Automatic reconnection If the remote end (server) breaks the connection, the code will try to perpetually reconnect, by using an exponential backoff strategy, capped at one retry every 10 seconds. This behavior can be disabled. Large messages Large frames are broken up into smaller chunks or messages to avoid filling up the os tcp buffers, which is permitted thanks to WebSocket fragmentation . Messages up to 1G were sent and received succesfully. Testing The library has an interactive tool which is handy for testing compatibility ith other libraries. We have tested our client against Python, Erlang, Node.js, and C++ websocket server libraries. The unittest tries to be comprehensive, and has been running on multiple platforms, with different sanitizers such as a thread sanitizer to catch data races or the undefined behavior sanitizer. The regression test is running after each commit on travis. Limitations On Windows and Android certificate validation needs to be setup so that SocketTLSOptions.caFile point to a pem file, such as the one distributed by Firefox. Unless that setup is done connecting to a wss endpoint will display an error. On Windows with mbedtls the message will contain error in handshake : X509 - Certificate verification failed, e.g. CRL, CA or signature check failed . There is no convenient way to embed a ca cert. Automatic reconnection works at the TCP socket level, and will detect remote end disconnects. However, if the device/computer network become unreachable (by turning off wifi), it is quite hard to reliably and timely detect it at the socket level using recv and send error codes. Here is a good discussion on the subject. This behavior is consistent with other runtimes such as node.js. One way to detect a disconnected device with low level C code is to do a name resolution with DNS but this can be expensive. Mobile devices have good and reliable API to do that. The server code is using select to detect incoming data, and creates one OS thread per connection. This is not as scalable as strategies using epoll or kqueue. C++ code organization Here is a simplistic diagram which explains how the code is structured in term of class/modules. +-----------------------+ --- Public | | Start the receiving Background thread. Auto reconnection. Simple websocket Ping. | IXWebSocket | Interface used by C++ test clients. No IX dependencies. | | +-----------------------+ | | | IXWebSocketServer | Run a server and give each connections its own WebSocket object. | | Each connection is handled in a new OS thread. | | +-----------------------+ --- Private | | | IXWebSocketTransport | Low level websocket code, framing, managing raw socket. Adapted from easywsclient. | | +-----------------------+ | | | IXWebSocketHandshake | Establish the connection between client and server. | | +-----------------------+ | | | IXWebSocket | ws:// Unencrypted Socket handler | IXWebSocketAppleSSL | wss:// TLS encrypted Socket AppleSSL handler. Used on iOS and macOS | IXWebSocketOpenSSL | wss:// TLS encrypted Socket OpenSSL handler. Used on Android and Linux | | Can be used on macOS too. +-----------------------+ | | | IXSocketConnect | Connect to the remote host (client). | | +-----------------------+ | | | IXDNSLookup | Does DNS resolution asynchronously so that it can be interrupted. | | +-----------------------+","title":"Design"},{"location":"design/#implementation-details","text":"","title":"Implementation details"},{"location":"design/#per-message-deflate-compression","text":"The per message deflate compression option is supported. It can lead to very nice bandbwith savings (20x !) if your messages are similar, which is often the case for example for chat applications. All features of the spec should be supported.","title":"Per Message Deflate compression."},{"location":"design/#tlsssl","text":"Connections can be optionally secured and encrypted with TLS/SSL when using a wss:// endpoint, or using normal un-encrypted socket with ws:// endpoints. AppleSSL is used on iOS and macOS, OpenSSL is used on Android and Linux, mbedTLS is used on Windows.","title":"TLS/SSL"},{"location":"design/#polling-and-background-thread-work","text":"No manual polling to fetch data is required. Data is sent and received instantly by using a background thread for receiving data and the select system call to be notified by the OS of incoming data. No timeout is used for select so that the background thread is only woken up when data is available, to optimize battery life. This is also the recommended way of using select according to the select tutorial, section select law . Read and Writes to the socket are non blocking. Data is sent right away and not enqueued by writing directly to the socket, which is possible since system socket implementations allow concurrent read/writes. However concurrent writes need to be protected with mutex.","title":"Polling and background thread work"},{"location":"design/#automatic-reconnection","text":"If the remote end (server) breaks the connection, the code will try to perpetually reconnect, by using an exponential backoff strategy, capped at one retry every 10 seconds. This behavior can be disabled.","title":"Automatic reconnection"},{"location":"design/#large-messages","text":"Large frames are broken up into smaller chunks or messages to avoid filling up the os tcp buffers, which is permitted thanks to WebSocket fragmentation . Messages up to 1G were sent and received succesfully.","title":"Large messages"},{"location":"design/#testing","text":"The library has an interactive tool which is handy for testing compatibility ith other libraries. We have tested our client against Python, Erlang, Node.js, and C++ websocket server libraries. The unittest tries to be comprehensive, and has been running on multiple platforms, with different sanitizers such as a thread sanitizer to catch data races or the undefined behavior sanitizer. The regression test is running after each commit on travis.","title":"Testing"},{"location":"design/#limitations","text":"On Windows and Android certificate validation needs to be setup so that SocketTLSOptions.caFile point to a pem file, such as the one distributed by Firefox. Unless that setup is done connecting to a wss endpoint will display an error. On Windows with mbedtls the message will contain error in handshake : X509 - Certificate verification failed, e.g. CRL, CA or signature check failed . There is no convenient way to embed a ca cert. Automatic reconnection works at the TCP socket level, and will detect remote end disconnects. However, if the device/computer network become unreachable (by turning off wifi), it is quite hard to reliably and timely detect it at the socket level using recv and send error codes. Here is a good discussion on the subject. This behavior is consistent with other runtimes such as node.js. One way to detect a disconnected device with low level C code is to do a name resolution with DNS but this can be expensive. Mobile devices have good and reliable API to do that. The server code is using select to detect incoming data, and creates one OS thread per connection. This is not as scalable as strategies using epoll or kqueue.","title":"Limitations"},{"location":"design/#c-code-organization","text":"Here is a simplistic diagram which explains how the code is structured in term of class/modules. +-----------------------+ --- Public | | Start the receiving Background thread. Auto reconnection. Simple websocket Ping. | IXWebSocket | Interface used by C++ test clients. No IX dependencies. | | +-----------------------+ | | | IXWebSocketServer | Run a server and give each connections its own WebSocket object. | | Each connection is handled in a new OS thread. | | +-----------------------+ --- Private | | | IXWebSocketTransport | Low level websocket code, framing, managing raw socket. Adapted from easywsclient. | | +-----------------------+ | | | IXWebSocketHandshake | Establish the connection between client and server. | | +-----------------------+ | | | IXWebSocket | ws:// Unencrypted Socket handler | IXWebSocketAppleSSL | wss:// TLS encrypted Socket AppleSSL handler. Used on iOS and macOS | IXWebSocketOpenSSL | wss:// TLS encrypted Socket OpenSSL handler. Used on Android and Linux | | Can be used on macOS too. +-----------------------+ | | | IXSocketConnect | Connect to the remote host (client). | | +-----------------------+ | | | IXDNSLookup | Does DNS resolution asynchronously so that it can be interrupted. | | +-----------------------+","title":"C++ code organization"},{"location":"usage/","text":"Examples The ws folder countains many interactive programs for chat, file transfers , curl like http clients, demonstrating client and server usage. Windows note To use the network system on Windows, you need to initialize it once with WSAStartup() and clean it up with WSACleanup() . We have helpers for that which you can use, see below. This init would typically take place in your main function. #include <ixwebsocket/IXNetSystem.h> int main() { ix::initNetSystem(); ... ix::uninitNetSystem(); return 0; } WebSocket client API #include <ixwebsocket/IXWebSocket.h> ... // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Optional heart beat, sent every 45 seconds when there is not any traffic // to make sure that load balancers do not kill an idle connection. webSocket.setHeartBeatPeriod(45); // Per message deflate connection is enabled by default. You can tweak its parameters or disable it webSocket.disablePerMessageDeflate(); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); // The message can be sent in BINARY mode (useful if you send MsgPack data for example) webSocket.sendBinary(\"some serialized binary data\"); // ... finally ... // Stop the connection webSocket.stop() Sending messages websocket.send(\"foo\") will send a message. If the connection was closed and sending failed, the return value will be set to false. ReadyState getReadyState() returns the state of the connection. There are 4 possible states. ReadyState::Connecting - The connection is not yet open. ReadyState::Open - The connection is open and ready to communicate. ReadyState::Closing - The connection is in the process of closing. ReadyState::Closed - The connection is closed or could not be opened. Open and Close notifications The onMessage event will be fired when the connection is opened or closed. This is similar to the JavaScript browser API , which has open and close events notification that can be registered with the browser addEventListener . webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Open) { std::cout << \"send greetings\" << std::endl; // Headers can be inspected (pairs of string/string) std::cout << \"Handshake Headers:\" << std::endl; for (auto it : msg->headers) { std::cout << it.first << \": \" << it.second << std::endl; } } else if (msg->type == ix::WebSocketMessageType::Close) { std::cout << \"disconnected\" << std::endl; // The server can send an explicit code and reason for closing. // This data can be accessed through the closeInfo object. std::cout << msg->closeInfo.code << std::endl; std::cout << msg->closeInfo.reason << std::endl; } } ); Error notification A message will be fired when there is an error with the connection. The message type will be ix::WebSocketMessageType::Error . Multiple fields will be available on the event to describe the error. webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Error) { std::stringstream ss; ss << \"Error: \" << msg->errorInfo.reason << std::endl; ss << \"#retries: \" << msg->eventInfo.retries << std::endl; ss << \"Wait time(ms): \" << msg->eventInfo.wait_time << std::endl; ss << \"HTTP Status: \" << msg->eventInfo.http_status << std::endl; std::cout << ss.str() << std::endl; } } ); start, stop websocket.start() connect to the remote server and starts the message receiving background thread. websocket.stop() disconnect from the remote server and closes the background thread. Configuring the remote url The url can be set and queried after a websocket object has been created. You will have to call stop and start if you want to disconnect and connect to that new url. std::string url(\"wss://example.com\"); websocket.configure(url); Ping/Pong support Ping/pong messages are used to implement keep-alive. 2 message types exists to identify ping and pong messages. Note that when a ping message is received, a pong is instantly send back as requested by the WebSocket spec. webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Ping || msg->type == ix::WebSocketMessageType::Pong) { std::cout << \"pong data: \" << msg->str << std::endl; } } ); A ping message can be sent to the server, with an optional data string. websocket.ping(\"ping data, optional (empty string is ok): limited to 125 bytes long\"); Heartbeat. You can configure an optional heart beat / keep-alive, sent every 45 seconds when there is no any traffic to make sure that load balancers do not kill an idle connection. webSocket.setHeartBeatPeriod(45); Supply extra HTTP headers. You can set extra HTTP headers to be sent during the WebSocket handshake. WebSocketHttpHeaders headers; headers[\"foo\"] = \"bar\"; webSocket.setExtraHeaders(headers); Subprotocols You can specify subprotocols to be set during the WebSocket handshake. For more info you can refer to this doc . webSocket.addSubprotocol(\"appProtocol-v1\"); webSocket.addSubprotocol(\"appProtocol-v2\"); The protocol that the server did accept is available in the open info protocol field. std::cout << \"protocol: \" << msg->openInfo.protocol << std::endl; Automatic reconnection Automatic reconnection kicks in when the connection is disconnected without the user consent. This feature is on by default and can be turned off. webSocket.enableAutomaticReconnection(); // turn on webSocket.disableAutomaticReconnection(); // turn off bool enabled = webSocket.isAutomaticReconnectionEnabled(); // query state The technique to calculate wait time is called exponential backoff . Here are the default waiting times between attempts (from connecting with ws connect ws://foo.com ) > Connection error: Got bad status connecting to foo.com, status: 301, HTTP Status line: HTTP/1.1 301 Moved Permanently #retries: 1 Wait time(ms): 100 #retries: 2 Wait time(ms): 200 #retries: 3 Wait time(ms): 400 #retries: 4 Wait time(ms): 800 #retries: 5 Wait time(ms): 1600 #retries: 6 Wait time(ms): 3200 #retries: 7 Wait time(ms): 6400 #retries: 8 Wait time(ms): 10000 The waiting time is capped by default at 10s between 2 attempts, but that value can be changed and queried. webSocket.setMaxWaitBetweenReconnectionRetries(5 * 1000); // 5000ms = 5s uint32_t m = webSocket.getMaxWaitBetweenReconnectionRetries(); TLS support and configuration To leverage TLS features, the library must be compiled with the option USE_TLS=1 . Then, secure sockets are automatically used when connecting to a wss://* url. Additional TLS options can be configured by passing a ix::SocketTLSOptions instance to the setTLSOptions on ix::WebSocket (or ix::WebSocketServer or ix::HttpServer ) webSocket.setTLSOptions({ .certFile = \"path/to/cert/file.pem\", .keyFile = \"path/to/key/file.pem\", .caFile = \"path/to/trust/bundle/file.pem\" }); Specifying certFile and keyFile configures the certificate that will be used to communicate with TLS peers. On a client, this is only necessary for connecting to servers that require a client certificate. On a server, this is necessary for TLS support. Specifying caFile configures the trusted roots bundle file (in PEM format) that will be used to verify peer certificates. - The special value of SYSTEM (the default) indicates that the system-configured trust bundle should be used; this is generally what you want when connecting to any publicly exposed API/server. - The special value of NONE can be used to disable peer verification; this is only recommended to rule out certificate verification when testing connectivity. For a client, specifying caFile can be used if connecting to a server that uses a self-signed cert, or when using a custom CA in an internal environment. For a server, specifying caFile implies that: 1. You require clients to present a certificate 1. It must be signed by one of the trusted roots in the file WebSocket server API #include <ixwebsocket/IXWebSocketServer.h> ... // Run a server on localhost at a given port. // Bound host name, max connections and listen backlog can also be passed in as parameters. ix::WebSocketServer server(port); server.setOnConnectionCallback( [&server](std::shared_ptr<WebSocket> webSocket, std::shared_ptr<ConnectionState> connectionState) { webSocket->setOnMessageCallback( [webSocket, connectionState, &server](const ix::WebSocketMessagePtr msg) { if (msg->type == ix::WebSocketMessageType::Open) { std::cerr << \"New connection\" << std::endl; // A connection state object is available, and has a default id // You can subclass ConnectionState and pass an alternate factory // to override it. It is useful if you want to store custom // attributes per connection (authenticated bool flag, attributes, etc...) std::cerr << \"id: \" << connectionState->getId() << std::endl; // The uri the client did connect to. std::cerr << \"Uri: \" << msg->openInfo.uri << std::endl; std::cerr << \"Headers:\" << std::endl; for (auto it : msg->openInfo.headers) { std::cerr << it.first << \": \" << it.second << std::endl; } } else if (msg->type == ix::WebSocketMessageType::Message) { // For an echo server, we just send back to the client whatever was received by the server // All connected clients are available in an std::set. See the broadcast cpp example. // Second parameter tells whether we are sending the message in binary or text mode. // Here we send it in the same mode as it was received. webSocket->send(msg->str, msg->binary); } } ); } ); auto res = server.listen(); if (!res.first) { // Error handling return 1; } // Run the server in the background. Server can be stoped by calling server.stop() server.start(); // Block until server.stop() is called. server.wait(); HTTP client API #include <ixwebsocket/IXHttpClient.h> ... // // Preparation // HttpClient httpClient; HttpRequestArgsPtr args = httpClient.createRequest(); // Custom headers can be set WebSocketHttpHeaders headers; headers[\"Foo\"] = \"bar\"; args->extraHeaders = headers; // Timeout options args->connectTimeout = connectTimeout; args->transferTimeout = transferTimeout; // Redirect options args->followRedirects = followRedirects; args->maxRedirects = maxRedirects; // Misc args->compress = compress; // Enable gzip compression args->verbose = verbose; args->logger = [](const std::string& msg) { std::cout << msg; }; // // Synchronous Request // HttpResponsePtr out; std::string url = \"https://www.google.com\"; // HEAD request out = httpClient.head(url, args); // GET request out = httpClient.get(url, args); // POST request with parameters HttpParameters httpParameters; httpParameters[\"foo\"] = \"bar\"; out = httpClient.post(url, httpParameters, args); // POST request with a body out = httpClient.post(url, std::string(\"foo=bar\"), args); // // Result // auto statusCode = response->statusCode; // Can be HttpErrorCode::Ok, HttpErrorCode::UrlMalformed, etc... auto errorCode = response->errorCode; // 200, 404, etc... auto responseHeaders = response->headers; // All the headers in a special case-insensitive unordered_map of (string, string) auto payload = response->payload; // All the bytes from the response as an std::string auto errorMsg = response->errorMsg; // Descriptive error message in case of failure auto uploadSize = response->uploadSize; // Byte count of uploaded data auto downloadSize = response->downloadSize; // Byte count of downloaded data // // Asynchronous Request // bool async = true; HttpClient httpClient(async); auto args = httpClient.createRequest(url, HttpClient::kGet); // Push the request to a queue, bool ok = httpClient.performRequest(args, [](const HttpResponsePtr& response) { // This callback execute in a background thread. Make sure you uses appropriate protection such as mutex auto statusCode = response->statusCode; // acess results } ); // ok will be false if your httpClient is not async HTTP server API #include <ixwebsocket/IXHttpServer.h> ix::HttpServer server(port, hostname); auto res = server.listen(); if (!res.first) { std::cerr << res.second << std::endl; return 1; } server.start(); server.wait(); If you want to handle how requests are processed, implement the setOnConnectionCallback callback, which takes an HttpRequestPtr as input, and returns an HttpResponsePtr. You can look at HttpServer::setDefaultConnectionCallback for a slightly more advanced callback example. setOnConnectionCallback( [this](HttpRequestPtr request, std::shared_ptr<ConnectionState> /*connectionState*/) -> HttpResponsePtr { // Build a string for the response std::stringstream ss; ss << request->method << \" \" << request->uri; std::string content = ss.str(); return std::make_shared<HttpResponse>(200, \"OK\", HttpErrorCode::Ok, WebSocketHttpHeaders(), content); }","title":"Examples"},{"location":"usage/#examples","text":"The ws folder countains many interactive programs for chat, file transfers , curl like http clients, demonstrating client and server usage.","title":"Examples"},{"location":"usage/#windows-note","text":"To use the network system on Windows, you need to initialize it once with WSAStartup() and clean it up with WSACleanup() . We have helpers for that which you can use, see below. This init would typically take place in your main function. #include <ixwebsocket/IXNetSystem.h> int main() { ix::initNetSystem(); ... ix::uninitNetSystem(); return 0; }","title":"Windows note"},{"location":"usage/#websocket-client-api","text":"#include <ixwebsocket/IXWebSocket.h> ... // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Optional heart beat, sent every 45 seconds when there is not any traffic // to make sure that load balancers do not kill an idle connection. webSocket.setHeartBeatPeriod(45); // Per message deflate connection is enabled by default. You can tweak its parameters or disable it webSocket.disablePerMessageDeflate(); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); // The message can be sent in BINARY mode (useful if you send MsgPack data for example) webSocket.sendBinary(\"some serialized binary data\"); // ... finally ... // Stop the connection webSocket.stop()","title":"WebSocket client API"},{"location":"usage/#sending-messages","text":"websocket.send(\"foo\") will send a message. If the connection was closed and sending failed, the return value will be set to false.","title":"Sending messages"},{"location":"usage/#readystate","text":"getReadyState() returns the state of the connection. There are 4 possible states. ReadyState::Connecting - The connection is not yet open. ReadyState::Open - The connection is open and ready to communicate. ReadyState::Closing - The connection is in the process of closing. ReadyState::Closed - The connection is closed or could not be opened.","title":"ReadyState"},{"location":"usage/#open-and-close-notifications","text":"The onMessage event will be fired when the connection is opened or closed. This is similar to the JavaScript browser API , which has open and close events notification that can be registered with the browser addEventListener . webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Open) { std::cout << \"send greetings\" << std::endl; // Headers can be inspected (pairs of string/string) std::cout << \"Handshake Headers:\" << std::endl; for (auto it : msg->headers) { std::cout << it.first << \": \" << it.second << std::endl; } } else if (msg->type == ix::WebSocketMessageType::Close) { std::cout << \"disconnected\" << std::endl; // The server can send an explicit code and reason for closing. // This data can be accessed through the closeInfo object. std::cout << msg->closeInfo.code << std::endl; std::cout << msg->closeInfo.reason << std::endl; } } );","title":"Open and Close notifications"},{"location":"usage/#error-notification","text":"A message will be fired when there is an error with the connection. The message type will be ix::WebSocketMessageType::Error . Multiple fields will be available on the event to describe the error. webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Error) { std::stringstream ss; ss << \"Error: \" << msg->errorInfo.reason << std::endl; ss << \"#retries: \" << msg->eventInfo.retries << std::endl; ss << \"Wait time(ms): \" << msg->eventInfo.wait_time << std::endl; ss << \"HTTP Status: \" << msg->eventInfo.http_status << std::endl; std::cout << ss.str() << std::endl; } } );","title":"Error notification"},{"location":"usage/#start-stop","text":"websocket.start() connect to the remote server and starts the message receiving background thread. websocket.stop() disconnect from the remote server and closes the background thread.","title":"start, stop"},{"location":"usage/#configuring-the-remote-url","text":"The url can be set and queried after a websocket object has been created. You will have to call stop and start if you want to disconnect and connect to that new url. std::string url(\"wss://example.com\"); websocket.configure(url);","title":"Configuring the remote url"},{"location":"usage/#pingpong-support","text":"Ping/pong messages are used to implement keep-alive. 2 message types exists to identify ping and pong messages. Note that when a ping message is received, a pong is instantly send back as requested by the WebSocket spec. webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Ping || msg->type == ix::WebSocketMessageType::Pong) { std::cout << \"pong data: \" << msg->str << std::endl; } } ); A ping message can be sent to the server, with an optional data string. websocket.ping(\"ping data, optional (empty string is ok): limited to 125 bytes long\");","title":"Ping/Pong support"},{"location":"usage/#heartbeat","text":"You can configure an optional heart beat / keep-alive, sent every 45 seconds when there is no any traffic to make sure that load balancers do not kill an idle connection. webSocket.setHeartBeatPeriod(45);","title":"Heartbeat."},{"location":"usage/#supply-extra-http-headers","text":"You can set extra HTTP headers to be sent during the WebSocket handshake. WebSocketHttpHeaders headers; headers[\"foo\"] = \"bar\"; webSocket.setExtraHeaders(headers);","title":"Supply extra HTTP headers."},{"location":"usage/#subprotocols","text":"You can specify subprotocols to be set during the WebSocket handshake. For more info you can refer to this doc . webSocket.addSubprotocol(\"appProtocol-v1\"); webSocket.addSubprotocol(\"appProtocol-v2\"); The protocol that the server did accept is available in the open info protocol field. std::cout << \"protocol: \" << msg->openInfo.protocol << std::endl;","title":"Subprotocols"},{"location":"usage/#automatic-reconnection","text":"Automatic reconnection kicks in when the connection is disconnected without the user consent. This feature is on by default and can be turned off. webSocket.enableAutomaticReconnection(); // turn on webSocket.disableAutomaticReconnection(); // turn off bool enabled = webSocket.isAutomaticReconnectionEnabled(); // query state The technique to calculate wait time is called exponential backoff . Here are the default waiting times between attempts (from connecting with ws connect ws://foo.com ) > Connection error: Got bad status connecting to foo.com, status: 301, HTTP Status line: HTTP/1.1 301 Moved Permanently #retries: 1 Wait time(ms): 100 #retries: 2 Wait time(ms): 200 #retries: 3 Wait time(ms): 400 #retries: 4 Wait time(ms): 800 #retries: 5 Wait time(ms): 1600 #retries: 6 Wait time(ms): 3200 #retries: 7 Wait time(ms): 6400 #retries: 8 Wait time(ms): 10000 The waiting time is capped by default at 10s between 2 attempts, but that value can be changed and queried. webSocket.setMaxWaitBetweenReconnectionRetries(5 * 1000); // 5000ms = 5s uint32_t m = webSocket.getMaxWaitBetweenReconnectionRetries();","title":"Automatic reconnection"},{"location":"usage/#tls-support-and-configuration","text":"To leverage TLS features, the library must be compiled with the option USE_TLS=1 . Then, secure sockets are automatically used when connecting to a wss://* url. Additional TLS options can be configured by passing a ix::SocketTLSOptions instance to the setTLSOptions on ix::WebSocket (or ix::WebSocketServer or ix::HttpServer ) webSocket.setTLSOptions({ .certFile = \"path/to/cert/file.pem\", .keyFile = \"path/to/key/file.pem\", .caFile = \"path/to/trust/bundle/file.pem\" }); Specifying certFile and keyFile configures the certificate that will be used to communicate with TLS peers. On a client, this is only necessary for connecting to servers that require a client certificate. On a server, this is necessary for TLS support. Specifying caFile configures the trusted roots bundle file (in PEM format) that will be used to verify peer certificates. - The special value of SYSTEM (the default) indicates that the system-configured trust bundle should be used; this is generally what you want when connecting to any publicly exposed API/server. - The special value of NONE can be used to disable peer verification; this is only recommended to rule out certificate verification when testing connectivity. For a client, specifying caFile can be used if connecting to a server that uses a self-signed cert, or when using a custom CA in an internal environment. For a server, specifying caFile implies that: 1. You require clients to present a certificate 1. It must be signed by one of the trusted roots in the file","title":"TLS support and configuration"},{"location":"usage/#websocket-server-api","text":"#include <ixwebsocket/IXWebSocketServer.h> ... // Run a server on localhost at a given port. // Bound host name, max connections and listen backlog can also be passed in as parameters. ix::WebSocketServer server(port); server.setOnConnectionCallback( [&server](std::shared_ptr<WebSocket> webSocket, std::shared_ptr<ConnectionState> connectionState) { webSocket->setOnMessageCallback( [webSocket, connectionState, &server](const ix::WebSocketMessagePtr msg) { if (msg->type == ix::WebSocketMessageType::Open) { std::cerr << \"New connection\" << std::endl; // A connection state object is available, and has a default id // You can subclass ConnectionState and pass an alternate factory // to override it. It is useful if you want to store custom // attributes per connection (authenticated bool flag, attributes, etc...) std::cerr << \"id: \" << connectionState->getId() << std::endl; // The uri the client did connect to. std::cerr << \"Uri: \" << msg->openInfo.uri << std::endl; std::cerr << \"Headers:\" << std::endl; for (auto it : msg->openInfo.headers) { std::cerr << it.first << \": \" << it.second << std::endl; } } else if (msg->type == ix::WebSocketMessageType::Message) { // For an echo server, we just send back to the client whatever was received by the server // All connected clients are available in an std::set. See the broadcast cpp example. // Second parameter tells whether we are sending the message in binary or text mode. // Here we send it in the same mode as it was received. webSocket->send(msg->str, msg->binary); } } ); } ); auto res = server.listen(); if (!res.first) { // Error handling return 1; } // Run the server in the background. Server can be stoped by calling server.stop() server.start(); // Block until server.stop() is called. server.wait();","title":"WebSocket server API"},{"location":"usage/#http-client-api","text":"#include <ixwebsocket/IXHttpClient.h> ... // // Preparation // HttpClient httpClient; HttpRequestArgsPtr args = httpClient.createRequest(); // Custom headers can be set WebSocketHttpHeaders headers; headers[\"Foo\"] = \"bar\"; args->extraHeaders = headers; // Timeout options args->connectTimeout = connectTimeout; args->transferTimeout = transferTimeout; // Redirect options args->followRedirects = followRedirects; args->maxRedirects = maxRedirects; // Misc args->compress = compress; // Enable gzip compression args->verbose = verbose; args->logger = [](const std::string& msg) { std::cout << msg; }; // // Synchronous Request // HttpResponsePtr out; std::string url = \"https://www.google.com\"; // HEAD request out = httpClient.head(url, args); // GET request out = httpClient.get(url, args); // POST request with parameters HttpParameters httpParameters; httpParameters[\"foo\"] = \"bar\"; out = httpClient.post(url, httpParameters, args); // POST request with a body out = httpClient.post(url, std::string(\"foo=bar\"), args); // // Result // auto statusCode = response->statusCode; // Can be HttpErrorCode::Ok, HttpErrorCode::UrlMalformed, etc... auto errorCode = response->errorCode; // 200, 404, etc... auto responseHeaders = response->headers; // All the headers in a special case-insensitive unordered_map of (string, string) auto payload = response->payload; // All the bytes from the response as an std::string auto errorMsg = response->errorMsg; // Descriptive error message in case of failure auto uploadSize = response->uploadSize; // Byte count of uploaded data auto downloadSize = response->downloadSize; // Byte count of downloaded data // // Asynchronous Request // bool async = true; HttpClient httpClient(async); auto args = httpClient.createRequest(url, HttpClient::kGet); // Push the request to a queue, bool ok = httpClient.performRequest(args, [](const HttpResponsePtr& response) { // This callback execute in a background thread. Make sure you uses appropriate protection such as mutex auto statusCode = response->statusCode; // acess results } ); // ok will be false if your httpClient is not async","title":"HTTP client API"},{"location":"usage/#http-server-api","text":"#include <ixwebsocket/IXHttpServer.h> ix::HttpServer server(port, hostname); auto res = server.listen(); if (!res.first) { std::cerr << res.second << std::endl; return 1; } server.start(); server.wait(); If you want to handle how requests are processed, implement the setOnConnectionCallback callback, which takes an HttpRequestPtr as input, and returns an HttpResponsePtr. You can look at HttpServer::setDefaultConnectionCallback for a slightly more advanced callback example. setOnConnectionCallback( [this](HttpRequestPtr request, std::shared_ptr<ConnectionState> /*connectionState*/) -> HttpResponsePtr { // Build a string for the response std::stringstream ss; ss << request->method << \" \" << request->uri; std::string content = ss.str(); return std::make_shared<HttpResponse>(200, \"OK\", HttpErrorCode::Ok, WebSocketHttpHeaders(), content); }","title":"HTTP server API"},{"location":"ws/","text":"General ws is a command line tool that should exercise most of the IXWebSocket code, and provide example code. ws is a websocket tool Usage: ws [OPTIONS] SUBCOMMAND Options: -h,--help Print this help message and exit Subcommands: send Send a file receive Receive a file transfer Broadcasting server connect Connect to a remote server chat Group chat echo_server Echo server broadcast_server Broadcasting server ping Ping pong curl HTTP Client redis_publish Redis publisher redis_subscribe Redis subscriber cobra_subscribe Cobra subscriber cobra_publish Cobra publisher cobra_to_statsd Cobra to statsd cobra_to_sentry Cobra to sentry snake Snake server httpd HTTP server curl The curl subcommand try to be compatible with the curl syntax, to fetch http pages. Making a HEAD request with the -I parameter. $ ws curl -I https://www.google.com/ Accept-Ranges: none Alt-Svc: quic=\":443\"; ma=2592000; v=\"46,43\",h3-Q048=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000 Cache-Control: private, max-age=0 Content-Type: text/html; charset=ISO-8859-1 Date: Tue, 08 Oct 2019 21:36:57 GMT Expires: -1 P3P: CP=\"This is not a P3P policy! See g.co/p3phelp for more info.\" Server: gws Set-Cookie: NID=188=ASwfz8GrXQrHCLqAz-AndLOMLcz0rC9yecnf3h0yXZxRL3rTufTU_GDDwERp7qQL7LZ_EB8gCRyPXGERyOSAgaqgnrkoTmvWrwFemRLMaOZ896GrHobi5fV7VLklnSG2w48Gj8xMlwxfP7Z-bX-xR9UZxep1tHM6UmFQdD_GkBE; expires=Wed, 08-Apr-2020 21:36:57 GMT; path=/; domain=.google.com; HttpOnly Transfer-Encoding: chunked Vary: Accept-Encoding X-Frame-Options: SAMEORIGIN X-XSS-Protection: 0 Upload size: 143 Download size: 0 Status: 200 Making a POST request with the -F parameter. $ ws curl -F foo=bar https://httpbin.org/post foo: bar Downloaded 438 bytes out of 438 Access-Control-Allow-Credentials: true Access-Control-Allow-Origin: * Connection: keep-alive Content-Encoding: Content-Length: 438 Content-Type: application/json Date: Tue, 08 Oct 2019 21:47:54 GMT Referrer-Policy: no-referrer-when-downgrade Server: nginx X-Content-Type-Options: nosniff X-Frame-Options: DENY X-XSS-Protection: 1; mode=block Upload size: 219 Download size: 438 Status: 200 payload: { \"args\": {}, \"data\": \"\", \"files\": {}, \"form\": { \"foo\": \"bar\" }, \"headers\": { \"Accept\": \"*/*\", \"Content-Length\": \"7\", \"Content-Type\": \"application/x-www-form-urlencoded\", \"Host\": \"httpbin.org\", \"User-Agent\": \"ixwebsocket/7.0.0 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11\" }, \"json\": null, \"origin\": \"155.94.127.118, 155.94.127.118\", \"url\": \"https://httpbin.org/post\" } Passing in a custom header with -H. $ ws curl -F foo=bar -H 'my_custom_header: baz' https://httpbin.org/post my_custom_header: baz foo: bar Downloaded 470 bytes out of 470 Access-Control-Allow-Credentials: true Access-Control-Allow-Origin: * Connection: keep-alive Content-Encoding: Content-Length: 470 Content-Type: application/json Date: Tue, 08 Oct 2019 21:50:25 GMT Referrer-Policy: no-referrer-when-downgrade Server: nginx X-Content-Type-Options: nosniff X-Frame-Options: DENY X-XSS-Protection: 1; mode=block Upload size: 243 Download size: 470 Status: 200 payload: { \"args\": {}, \"data\": \"\", \"files\": {}, \"form\": { \"foo\": \"bar\" }, \"headers\": { \"Accept\": \"*/*\", \"Content-Length\": \"7\", \"Content-Type\": \"application/x-www-form-urlencoded\", \"Host\": \"httpbin.org\", \"My-Custom-Header\": \"baz\", \"User-Agent\": \"ixwebsocket/7.0.0 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11\" }, \"json\": null, \"origin\": \"155.94.127.118, 155.94.127.118\", \"url\": \"https://httpbin.org/post\" } connect The connect command connects to a websocket endpoint, and starts an interactive prompt. Line editing, such as using the direction keys to fetch the last thing you tried to type) is provided. That command is pretty useful to try to send random data to an endpoint and verify that the service handles it with grace (such as sending invalid json). ws connect wss://echo.websocket.org Type Ctrl-D to exit prompt... Connecting to url: wss://echo.websocket.org > ws_connect: connected Uri: / Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:38:44 GMT Sec-WebSocket-Accept: 2j6LBScZveqrMx1W/GJkCWvZo3M= sec-websocket-extensions: Server: Kaazing Gateway Upgrade: websocket Received ping Received ping Received ping Hello world ! > Received 13 bytes ws_connect: received message: Hello world ! > Hello world ! > Received 13 bytes ws_connect: received message: Hello world ! ws connect 'ws://jeanserge.com/v2?appkey=_pubsub' Type Ctrl-D to exit prompt... Connecting to url: ws://jeanserge.com/v2?appkey=_pubsub > ws_connect: connected Uri: /v2?appkey=_pubsub Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:45:28 GMT Sec-WebSocket-Accept: LYHmjh9Gsu/Yw7aumQqyPObOEV4= Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Server: Python/3.7 websockets/8.0.2 Upgrade: websocket bababababababab > ws_connect: connection closed: code 1000 reason ws_connect: connected Uri: /v2?appkey=_pubsub Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:45:44 GMT Sec-WebSocket-Accept: I1rqxdLgTU+opPi5/zKPBTuXdLw= Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Server: Python/3.7 websockets/8.0.2 Upgrade: websocket Websocket proxy ws proxy_server --remote_host ws://127.0.0.1:9000 -v Listening on 127.0.0.1:8008 If you connect to ws://127.0.0.1:8008, the proxy will connect to ws://127.0.0.1:9000 and pass all traffic to this server. File transfer # Start transfer server, which is just a broadcast server at this point ws transfer # running on port 8080. # Start receiver first ws receive ws://localhost:8080 # Then send a file. File will be received and written to disk by the receiver process ws send ws://localhost:8080 /file/to/path HTTP Client $ ws curl --help HTTP Client Usage: ws curl [OPTIONS] url Positionals: url TEXT REQUIRED Connection url Options: -h,--help Print this help message and exit -d TEXT Form data -F TEXT Form data -H TEXT Header --output TEXT Output file -I Send a HEAD request -L Follow redirects --max-redirects INT Max Redirects -v Verbose -O Save output to disk --compress Enable gzip compression --connect-timeout INT Connection timeout --transfer-timeout INT Transfer timeout Cobra client and server cobra is a real time messenging server. ws has several sub-command to interact with cobra. There is also a minimal cobra compatible server named snake available. Below are examples on running a snake server and clients with TLS enabled (the server only works with the OpenSSL and the Mbed TLS backend for now). First, generate certificates. $ cd /path/to/IXWebSocket $ cd ixsnake/ixsnake $ bash ../../ws/generate_certs.sh Generating RSA private key, 2048 bit long modulus .....+++ .................+++ e is 65537 (0x10001) generated ./.certs/trusted-ca-key.pem generated ./.certs/trusted-ca-crt.pem Generating RSA private key, 2048 bit long modulus ..+++ .......................................+++ e is 65537 (0x10001) generated ./.certs/trusted-server-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=trusted-server Getting CA Private Key generated ./.certs/trusted-server-crt.pem Generating RSA private key, 2048 bit long modulus ...................................+++ ..................................................+++ e is 65537 (0x10001) generated ./.certs/trusted-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=trusted-client Getting CA Private Key generated ./.certs/trusted-client-crt.pem Generating RSA private key, 2048 bit long modulus ..............+++ .......................................+++ e is 65537 (0x10001) generated ./.certs/untrusted-ca-key.pem generated ./.certs/untrusted-ca-crt.pem Generating RSA private key, 2048 bit long modulus ..........+++ ................................................+++ e is 65537 (0x10001) generated ./.certs/untrusted-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=untrusted-client Getting CA Private Key generated ./.certs/untrusted-client-crt.pem Generating RSA private key, 2048 bit long modulus .....................................................................................+++ ...........+++ e is 65537 (0x10001) generated ./.certs/selfsigned-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=selfsigned-client Getting Private key generated ./.certs/selfsigned-client-crt.pem Now run the snake server. $ export certs=.certs $ ws snake --tls --port 8765 --cert-file ${certs}/trusted-server-crt.pem --key-file ${certs}/trusted-server-key.pem --ca-file ${certs}/trusted-ca-crt.pem { \"apps\": { \"FC2F10139A2BAc53BB72D9db967b024f\": { \"roles\": { \"_sub\": { \"secret\": \"66B1dA3ED5fA074EB5AE84Dd8CE3b5ba\" }, \"_pub\": { \"secret\": \"1c04DB8fFe76A4EeFE3E318C72d771db\" } } } } } redis host: 127.0.0.1 redis password: redis port: 6379 As a new connection comes in, such output should be printed [2019-12-19 20:27:19.724] [info] New connection id: 0 Uri: /v2?appkey=_health Headers: Connection: Upgrade Host: 127.0.0.1:8765 Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Sec-WebSocket-Key: d747B0fE61Db73f7Eh47c0== Sec-WebSocket-Protocol: json Sec-WebSocket-Version: 13 Upgrade: websocket User-Agent: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11 To connect and publish a message, do: $ export certs=.certs $ cd /path/to/ws/folder $ ls cobraMetricsSample.json cobraMetricsSample.json $ ws cobra_publish --endpoint wss://127.0.0.1:8765 --appkey FC2F10139A2BAc53BB72D9db967b024f --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db --channel foo --cert-file ${certs}/trusted-client-crt.pem --key-file ${certs}/trusted-client-key.pem --ca-file ${certs}/trusted-ca-crt.pem cobraMetricsSample.json [2019-12-19 20:46:42.656] [info] Publisher connected [2019-12-19 20:46:42.657] [info] Connection: Upgrade [2019-12-19 20:46:42.657] [info] Sec-WebSocket-Accept: rs99IFThoBrhSg+k8G4ixH9yaq4= [2019-12-19 20:46:42.657] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-12-19 20:46:42.657] [info] Server: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11 [2019-12-19 20:46:42.657] [info] Upgrade: websocket [2019-12-19 20:46:42.658] [info] Publisher authenticated [2019-12-19 20:46:42.658] [info] Published msg 3 [2019-12-19 20:46:42.659] [info] Published message id 3 acked To use OpenSSL on macOS, compile with make ws_openssl . First you will have to install OpenSSL libraries, which can be done with Homebrew. Use make ws_mbedtls accordingly to use MbedTLS.","title":"Ws"},{"location":"ws/#general","text":"ws is a command line tool that should exercise most of the IXWebSocket code, and provide example code. ws is a websocket tool Usage: ws [OPTIONS] SUBCOMMAND Options: -h,--help Print this help message and exit Subcommands: send Send a file receive Receive a file transfer Broadcasting server connect Connect to a remote server chat Group chat echo_server Echo server broadcast_server Broadcasting server ping Ping pong curl HTTP Client redis_publish Redis publisher redis_subscribe Redis subscriber cobra_subscribe Cobra subscriber cobra_publish Cobra publisher cobra_to_statsd Cobra to statsd cobra_to_sentry Cobra to sentry snake Snake server httpd HTTP server","title":"General"},{"location":"ws/#curl","text":"The curl subcommand try to be compatible with the curl syntax, to fetch http pages. Making a HEAD request with the -I parameter. $ ws curl -I https://www.google.com/ Accept-Ranges: none Alt-Svc: quic=\":443\"; ma=2592000; v=\"46,43\",h3-Q048=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000 Cache-Control: private, max-age=0 Content-Type: text/html; charset=ISO-8859-1 Date: Tue, 08 Oct 2019 21:36:57 GMT Expires: -1 P3P: CP=\"This is not a P3P policy! See g.co/p3phelp for more info.\" Server: gws Set-Cookie: NID=188=ASwfz8GrXQrHCLqAz-AndLOMLcz0rC9yecnf3h0yXZxRL3rTufTU_GDDwERp7qQL7LZ_EB8gCRyPXGERyOSAgaqgnrkoTmvWrwFemRLMaOZ896GrHobi5fV7VLklnSG2w48Gj8xMlwxfP7Z-bX-xR9UZxep1tHM6UmFQdD_GkBE; expires=Wed, 08-Apr-2020 21:36:57 GMT; path=/; domain=.google.com; HttpOnly Transfer-Encoding: chunked Vary: Accept-Encoding X-Frame-Options: SAMEORIGIN X-XSS-Protection: 0 Upload size: 143 Download size: 0 Status: 200 Making a POST request with the -F parameter. $ ws curl -F foo=bar https://httpbin.org/post foo: bar Downloaded 438 bytes out of 438 Access-Control-Allow-Credentials: true Access-Control-Allow-Origin: * Connection: keep-alive Content-Encoding: Content-Length: 438 Content-Type: application/json Date: Tue, 08 Oct 2019 21:47:54 GMT Referrer-Policy: no-referrer-when-downgrade Server: nginx X-Content-Type-Options: nosniff X-Frame-Options: DENY X-XSS-Protection: 1; mode=block Upload size: 219 Download size: 438 Status: 200 payload: { \"args\": {}, \"data\": \"\", \"files\": {}, \"form\": { \"foo\": \"bar\" }, \"headers\": { \"Accept\": \"*/*\", \"Content-Length\": \"7\", \"Content-Type\": \"application/x-www-form-urlencoded\", \"Host\": \"httpbin.org\", \"User-Agent\": \"ixwebsocket/7.0.0 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11\" }, \"json\": null, \"origin\": \"155.94.127.118, 155.94.127.118\", \"url\": \"https://httpbin.org/post\" } Passing in a custom header with -H. $ ws curl -F foo=bar -H 'my_custom_header: baz' https://httpbin.org/post my_custom_header: baz foo: bar Downloaded 470 bytes out of 470 Access-Control-Allow-Credentials: true Access-Control-Allow-Origin: * Connection: keep-alive Content-Encoding: Content-Length: 470 Content-Type: application/json Date: Tue, 08 Oct 2019 21:50:25 GMT Referrer-Policy: no-referrer-when-downgrade Server: nginx X-Content-Type-Options: nosniff X-Frame-Options: DENY X-XSS-Protection: 1; mode=block Upload size: 243 Download size: 470 Status: 200 payload: { \"args\": {}, \"data\": \"\", \"files\": {}, \"form\": { \"foo\": \"bar\" }, \"headers\": { \"Accept\": \"*/*\", \"Content-Length\": \"7\", \"Content-Type\": \"application/x-www-form-urlencoded\", \"Host\": \"httpbin.org\", \"My-Custom-Header\": \"baz\", \"User-Agent\": \"ixwebsocket/7.0.0 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11\" }, \"json\": null, \"origin\": \"155.94.127.118, 155.94.127.118\", \"url\": \"https://httpbin.org/post\" }","title":"curl"},{"location":"ws/#connect","text":"The connect command connects to a websocket endpoint, and starts an interactive prompt. Line editing, such as using the direction keys to fetch the last thing you tried to type) is provided. That command is pretty useful to try to send random data to an endpoint and verify that the service handles it with grace (such as sending invalid json). ws connect wss://echo.websocket.org Type Ctrl-D to exit prompt... Connecting to url: wss://echo.websocket.org > ws_connect: connected Uri: / Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:38:44 GMT Sec-WebSocket-Accept: 2j6LBScZveqrMx1W/GJkCWvZo3M= sec-websocket-extensions: Server: Kaazing Gateway Upgrade: websocket Received ping Received ping Received ping Hello world ! > Received 13 bytes ws_connect: received message: Hello world ! > Hello world ! > Received 13 bytes ws_connect: received message: Hello world ! ws connect 'ws://jeanserge.com/v2?appkey=_pubsub' Type Ctrl-D to exit prompt... Connecting to url: ws://jeanserge.com/v2?appkey=_pubsub > ws_connect: connected Uri: /v2?appkey=_pubsub Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:45:28 GMT Sec-WebSocket-Accept: LYHmjh9Gsu/Yw7aumQqyPObOEV4= Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Server: Python/3.7 websockets/8.0.2 Upgrade: websocket bababababababab > ws_connect: connection closed: code 1000 reason ws_connect: connected Uri: /v2?appkey=_pubsub Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:45:44 GMT Sec-WebSocket-Accept: I1rqxdLgTU+opPi5/zKPBTuXdLw= Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Server: Python/3.7 websockets/8.0.2 Upgrade: websocket","title":"connect"},{"location":"ws/#websocket-proxy","text":"ws proxy_server --remote_host ws://127.0.0.1:9000 -v Listening on 127.0.0.1:8008 If you connect to ws://127.0.0.1:8008, the proxy will connect to ws://127.0.0.1:9000 and pass all traffic to this server.","title":"Websocket proxy"},{"location":"ws/#file-transfer","text":"# Start transfer server, which is just a broadcast server at this point ws transfer # running on port 8080. # Start receiver first ws receive ws://localhost:8080 # Then send a file. File will be received and written to disk by the receiver process ws send ws://localhost:8080 /file/to/path","title":"File transfer"},{"location":"ws/#http-client","text":"$ ws curl --help HTTP Client Usage: ws curl [OPTIONS] url Positionals: url TEXT REQUIRED Connection url Options: -h,--help Print this help message and exit -d TEXT Form data -F TEXT Form data -H TEXT Header --output TEXT Output file -I Send a HEAD request -L Follow redirects --max-redirects INT Max Redirects -v Verbose -O Save output to disk --compress Enable gzip compression --connect-timeout INT Connection timeout --transfer-timeout INT Transfer timeout","title":"HTTP Client"},{"location":"ws/#cobra-client-and-server","text":"cobra is a real time messenging server. ws has several sub-command to interact with cobra. There is also a minimal cobra compatible server named snake available. Below are examples on running a snake server and clients with TLS enabled (the server only works with the OpenSSL and the Mbed TLS backend for now). First, generate certificates. $ cd /path/to/IXWebSocket $ cd ixsnake/ixsnake $ bash ../../ws/generate_certs.sh Generating RSA private key, 2048 bit long modulus .....+++ .................+++ e is 65537 (0x10001) generated ./.certs/trusted-ca-key.pem generated ./.certs/trusted-ca-crt.pem Generating RSA private key, 2048 bit long modulus ..+++ .......................................+++ e is 65537 (0x10001) generated ./.certs/trusted-server-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=trusted-server Getting CA Private Key generated ./.certs/trusted-server-crt.pem Generating RSA private key, 2048 bit long modulus ...................................+++ ..................................................+++ e is 65537 (0x10001) generated ./.certs/trusted-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=trusted-client Getting CA Private Key generated ./.certs/trusted-client-crt.pem Generating RSA private key, 2048 bit long modulus ..............+++ .......................................+++ e is 65537 (0x10001) generated ./.certs/untrusted-ca-key.pem generated ./.certs/untrusted-ca-crt.pem Generating RSA private key, 2048 bit long modulus ..........+++ ................................................+++ e is 65537 (0x10001) generated ./.certs/untrusted-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=untrusted-client Getting CA Private Key generated ./.certs/untrusted-client-crt.pem Generating RSA private key, 2048 bit long modulus .....................................................................................+++ ...........+++ e is 65537 (0x10001) generated ./.certs/selfsigned-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=selfsigned-client Getting Private key generated ./.certs/selfsigned-client-crt.pem Now run the snake server. $ export certs=.certs $ ws snake --tls --port 8765 --cert-file ${certs}/trusted-server-crt.pem --key-file ${certs}/trusted-server-key.pem --ca-file ${certs}/trusted-ca-crt.pem { \"apps\": { \"FC2F10139A2BAc53BB72D9db967b024f\": { \"roles\": { \"_sub\": { \"secret\": \"66B1dA3ED5fA074EB5AE84Dd8CE3b5ba\" }, \"_pub\": { \"secret\": \"1c04DB8fFe76A4EeFE3E318C72d771db\" } } } } } redis host: 127.0.0.1 redis password: redis port: 6379 As a new connection comes in, such output should be printed [2019-12-19 20:27:19.724] [info] New connection id: 0 Uri: /v2?appkey=_health Headers: Connection: Upgrade Host: 127.0.0.1:8765 Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Sec-WebSocket-Key: d747B0fE61Db73f7Eh47c0== Sec-WebSocket-Protocol: json Sec-WebSocket-Version: 13 Upgrade: websocket User-Agent: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11 To connect and publish a message, do: $ export certs=.certs $ cd /path/to/ws/folder $ ls cobraMetricsSample.json cobraMetricsSample.json $ ws cobra_publish --endpoint wss://127.0.0.1:8765 --appkey FC2F10139A2BAc53BB72D9db967b024f --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db --channel foo --cert-file ${certs}/trusted-client-crt.pem --key-file ${certs}/trusted-client-key.pem --ca-file ${certs}/trusted-ca-crt.pem cobraMetricsSample.json [2019-12-19 20:46:42.656] [info] Publisher connected [2019-12-19 20:46:42.657] [info] Connection: Upgrade [2019-12-19 20:46:42.657] [info] Sec-WebSocket-Accept: rs99IFThoBrhSg+k8G4ixH9yaq4= [2019-12-19 20:46:42.657] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-12-19 20:46:42.657] [info] Server: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11 [2019-12-19 20:46:42.657] [info] Upgrade: websocket [2019-12-19 20:46:42.658] [info] Publisher authenticated [2019-12-19 20:46:42.658] [info] Published msg 3 [2019-12-19 20:46:42.659] [info] Published message id 3 acked To use OpenSSL on macOS, compile with make ws_openssl . First you will have to install OpenSSL libraries, which can be done with Homebrew. Use make ws_mbedtls accordingly to use MbedTLS.","title":"Cobra client and server"}]}
\ No newline at end of file
+{"config":{"lang":["en"],"prebuild_index":false,"separator":"[\\s\\-]+"},"docs":[{"location":"","text":"Introduction WebSocket is a computer communications protocol, providing full-duplex and bi-directionnal communication channels over a single TCP connection. IXWebSocket is a C++ library for client and server Websocket communication, and for client and server HTTP communication. TLS aka SSL is supported. The code is derived from easywsclient and from the Satori C SDK . It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD Example code // Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); Why another library? There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server. Contributing IXWebSocket is developed on GitHub . We'd love to hear about how you use it; opening up an issue on GitHub is ok for that. If things don't work as expected, please create an issue on GitHub, or even better a pull request if you know how to fix your problem.","title":"Home"},{"location":"#introduction","text":"WebSocket is a computer communications protocol, providing full-duplex and bi-directionnal communication channels over a single TCP connection. IXWebSocket is a C++ library for client and server Websocket communication, and for client and server HTTP communication. TLS aka SSL is supported. The code is derived from easywsclient and from the Satori C SDK . It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD","title":"Introduction"},{"location":"#example-code","text":"// Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\");","title":"Example code"},{"location":"#why-another-library","text":"There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server.","title":"Why another library?"},{"location":"#contributing","text":"IXWebSocket is developed on GitHub . We'd love to hear about how you use it; opening up an issue on GitHub is ok for that. If things don't work as expected, please create an issue on GitHub, or even better a pull request if you know how to fix your problem.","title":"Contributing"},{"location":"CHANGELOG/","text":"Changelog All changes to this project will be documented in this file. [8.1.5] - 2020-02-23 (server) give thread name to some usual worker threads / unittest is broken !! [8.1.4] - 2020-02-22 (websocket server) fix regression from 8.1.2, where per-deflate message compression was always disabled [8.1.3] - 2020-02-21 (client + server) Fix #155 / http header parser should treat the space(s) after the : delimiter as optional. Fixing this bug made us discover that websocket sub-protocols are not properly serialiazed, but start with a , [8.1.2] - 2020-02-18 (WebSocketServer) add option to disable deflate compression, exposed with the -x option to ws echo_server [8.1.1] - 2020-02-18 (ws cobra to statsd and sentry sender) exit if no messages are received for one minute, which is a sign that something goes wrong on the server side. That should be changed to be configurable in the future [8.1.0] - 2020-02-13 (http client + sentry minidump upload) Multipart stream closing boundary is invalid + mark some options as mandatory in the command line tools [8.0.7] - 2020-02-12 (build) remove the unused subtree which was causing some way of installing to break [8.0.6] - 2020-01-31 (snake) add an option to disable answering pongs as response to pings, to test cobra client behavior with hanged connections [8.0.5] - 2020-01-31 (IXCobraConnection) set a ping timeout of 90 seconds. If no pong messages are received as responses to ping for a while, give up and close the connection [8.0.4] - 2020-01-31 (cobra to sentry) remove noisy logging [8.0.3] - 2020-01-30 (ixcobra) check if we are authenticated in publishNext before trying to publish a message [8.0.2] - 2020-01-28 Extract severity level when emitting messages to sentry [8.0.1] - 2020-01-28 Fix bug #151 - If a socket connection is interrupted, calling stop() on the IXWebSocket object blocks until the next retry [8.0.0] - 2020-01-26 (SocketServer) add ability to bind on an ipv6 address [7.9.6] - 2020-01-22 (ws) add a dnslookup sub-command, to get the ip address of a remote host [7.9.5] - 2020-01-14 (windows) fix #144, get rid of stubbed/un-implemented windows schannel ssl backend [7.9.4] - 2020-01-12 (openssl + mbedssl) fix #140, can send large files with ws send over ssl / still broken with apple ssl [7.9.3] - 2020-01-10 (apple ssl) model write method after the OpenSSL one for consistency [7.9.2] - 2020-01-06 (apple ssl) unify read and write ssl utility code [7.9.1] - 2020-01-06 (websocket client) better error propagation when errors are detected while sending data (ws send) detect failures to send big files, terminate in those cases and report error [7.9.0] - 2020-01-04 (ws send) add option (-x) to disable per message deflate compression [7.8.9] - 2020-01-04 (ws send + receive) handle all message types (ping + pong + fragment) / investigate #140 [7.8.8] - 2019-12-28 (mbedtls) fix related to private key file parsing and initialization [7.8.6] - 2019-12-28 (ws cobra to sentry/statsd) fix for handling null events properly for empty queues + use queue to send data to statsd [7.8.5] - 2019-12-28 (ws cobra to sentry) handle null events for empty queues [7.8.4] - 2019-12-27 (ws cobra to sentry) game is picked in a fair manner, so that all games get the same share of sent events [7.8.3] - 2019-12-27 (ws cobra to sentry) refactor queue related code into a class [7.8.2] - 2019-12-25 (ws cobra to sentry) bound the queue size used to hold up cobra messages before they are sent to sentry. Default queue size is a 100 messages. Without such limit the program runs out of memory when a subscriber receive a lot of messages that cannot make it to sentry [7.8.1] - 2019-12-25 (ws client) use correct compilation defines so that spdlog is not used as a header only library (reduce binary size and increase compilation speed) [7.8.0] - 2019-12-24 (ws client) all commands use spdlog instead of std::cerr or std::cout for logging [7.6.5] - 2019-12-24 (cobra client) send a websocket ping every 30s to keep the connection opened [7.6.4] - 2019-12-22 (client) error handling, quote url in error case when failing to parse one (ws) ws_cobra_publish: register callbacks before connecting (doc) mention mbedtls in supported ssl server backend [7.6.3] - 2019-12-20 (tls) add a simple description of the TLS configuration routine for debugging [7.6.2] - 2019-12-20 (mbedtls) correct support for using own certificate and private key [7.6.1] - 2019-12-20 (ws commands) in websocket proxy, disable automatic reconnections + in Dockerfile, use alpine 3.11 [7.6.0] - 2019-12-19 (cobra) Add TLS options to all cobra commands and classes. Add example to the doc. [7.5.8] - 2019-12-18 (cobra-to-sentry) capture application version from device field [7.5.7] - 2019-12-18 (tls) Experimental TLS server support with mbedtls (windows) + process cert tlsoption (client + server) [7.5.6] - 2019-12-18 (tls servers) Make it clear that apple ssl and mbedtls backends do not support SSL in server mode [7.5.5] - 2019-12-17 (tls options client) TLSOptions struct _validated member should be initialized to false [7.5.4] - 2019-12-16 (websocket client) improve the error message when connecting to a non websocket server Before: Connection error: Got bad status connecting to example.com:443, status: 200, HTTP Status line: HTTP/1.1 200 OK After: Connection error: Expecting status 101 (Switching Protocol), got 200 status connecting to example.com:443, HTTP Status line: HTTP/1.1 200 OK [7.5.3] - 2019-12-12 (server) attempt at fixing #131 by using blocking writes in server mode [7.5.2] - 2019-12-11 (ws) cobra to sentry - created events with sentry tags based on tags present in the cobra messages [7.5.1] - 2019-12-06 (mac) convert SSL errors to utf8 [7.5.0] - 2019-12-05 (ws) cobra to sentry. Handle Error 429 Too Many Requests and politely wait before sending more data to sentry. In the example below sentry we are sending data too fast, sentry asks us to slow down which we do. Notice how the sent count stop increasing, while we are waiting for 41 seconds. [2019-12-05 15:50:33.759] [info] messages received 2449 sent 3 [2019-12-05 15:50:34.759] [info] messages received 5533 sent 7 [2019-12-05 15:50:35.759] [info] messages received 8612 sent 11 [2019-12-05 15:50:36.759] [info] messages received 11562 sent 15 [2019-12-05 15:50:37.759] [info] messages received 14410 sent 19 [2019-12-05 15:50:38.759] [info] messages received 17236 sent 23 [2019-12-05 15:50:39.282] [error] Error sending data to sentry: 429 [2019-12-05 15:50:39.282] [error] Body: {\"exception\":[{\"stacktrace\":{\"frames\":[{\"filename\":\"WorldScene.lua\",\"function\":\"WorldScene.lua:1935\",\"lineno\":1958},{\"filename\":\"WorldScene.lua\",\"function\":\"onUpdate_WorldCam\",\"lineno\":1921},{\"filename\":\"WorldMapTile.lua\",\"function\":\"__index\",\"lineno\":239}]},\"value\":\"noisytypes: Attempt to call nil(nil,2224139838)!\"}],\"platform\":\"python\",\"sdk\":{\"name\":\"ws\",\"version\":\"1.0.0\"},\"tags\":[[\"game\",\"niso\"],[\"userid\",\"107638363\"],[\"environment\",\"live\"]],\"timestamp\":\"2019-12-05T23:50:39Z\"} [2019-12-05 15:50:39.282] [error] Response: {\"error_name\":\"rate_limit\",\"error\":\"Creation of this event was denied due to rate limiting\"} [2019-12-05 15:50:39.282] [warning] Error 429 - Too Many Requests. ws will sleep and retry after 41 seconds [2019-12-05 15:50:39.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:40.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:41.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:42.761] [info] messages received 18839 sent 25 [2019-12-05 15:50:43.762] [info] messages received 18839 sent 25 [2019-12-05 15:50:44.763] [info] messages received 18839 sent 25 [2019-12-05 15:50:45.768] [info] messages received 18839 sent 25 [7.4.5] - 2019-12-03 (ws) #125 / fix build problem when jsoncpp is not installed locally [7.4.4] - 2019-12-03 (ws) #125 / cmake detects an already installed jsoncpp and will try to use this one if present [7.4.3] - 2019-12-03 (http client) use std::unordered_map instead of std::map for HttpParameters and HttpFormDataParameters class aliases [7.4.2] - 2019-12-02 (client) internal IXDNSLookup class requires a valid cancellation request function callback to be passed in [7.4.1] - 2019-12-02 (client) fix an overflow in the exponential back off code [7.4.0] - 2019-11-25 (http client) Add support for multipart HTTP POST upload (ixsentry) Add support for uploading a minidump to sentry [7.3.5] - 2019-11-20 On Darwin SSL, add ability to skip peer verification. [7.3.4] - 2019-11-20 32-bits compile fix, courtesy of @fcojavmc [7.3.1] - 2019-11-16 ws proxy_server / remote server close not forwarded to the client [7.3.0] - 2019-11-15 New ws command: ws proxy_server . [7.2.2] - 2019-11-01 Tag a release + minor reformating. [7.2.1] - 2019-10-26 Add unittest to IXSentryClient to lua backtrace parsing code [7.2.0] - 2019-10-24 Add cobra_metrics_to_redis sub-command to create streams for each cobra metric event being received. [7.1.0] - 2019-10-13 Add client support for websocket subprotocol. Look for the new addSubProtocol method for details. [7.0.0] - 2019-10-01 TLS support in server code, only implemented for the OpenSSL SSL backend for now. [6.3.4] - 2019-09-30 all ws subcommands propagate tls options to servers (unimplemented) or ws or http client (implemented) (contributed by Matt DeBoer) [6.3.3] - 2019-09-30 ws has a --version option [6.3.2] - 2019-09-29 (http + websocket clients) can specify cacert and some other tls options (not implemented on all backend). This makes it so that server certs can finally be validated on windows. [6.3.1] - 2019-09-29 Add ability to use OpenSSL on apple platforms. [6.3.0] - 2019-09-28 ixcobra / fix crash in CobraConnection::publishNext when the queue is empty + handle CobraConnection_PublishMode_Batch in CobraMetricsThreadedPublisher [6.2.9] - 2019-09-27 mbedtls fixes / the unittest now pass on macOS, and hopefully will on Windows/AppVeyor as well. [6.2.8] - 2019-09-26 Http server: add options to ws https to redirect all requests to a given url. POST requests will get a 200 and an empty response. ws httpd -L --redirect_url https://www.google.com [6.2.7] - 2019-09-25 Stop having ws send subcommand send a binary message in text mode, which would cause error in make ws_test shell script test. [6.2.6] - 2019-09-24 Fix 2 race conditions detected with TSan, one in CobraMetricsPublisher::push and another one in WebSocketTransport::sendData (that one was bad). [6.2.5] - 2019-09-23 Add simple Redis Server which is only capable of doing publish / subscribe. New ws redis_server sub-command to use it. The server is used in the unittest, so that we can run on CI in environment where redis isn not available like github actions env. [6.2.4] - 2019-09-22 Add options to configure TLS ; contributed by Matt DeBoer. Only implemented for OpenSSL TLS backend for now. [6.2.3] - 2019-09-21 Fix crash in the Linux unittest in the HTTP client code, in Socket::readBytes Cobra Metrics Publisher code returns the message id of the message that got published, to be used to validated that it got sent properly when receiving an ack. [6.2.2] - 2019-09-19 In DNS lookup code, make sure the weak pointer we use lives through the expected scope (if branch) [6.2.1] - 2019-09-17 On error while doing a client handshake, additionally display port number next to the host name [6.2.0] - 2019-09-09 websocket and http server: server does not close the bound client socket in many cases improve some websocket error messages add a utility function with unittest to parse status line and stop using scanf which triggers warnings on Windows update ws CLI11 (our command line argument parsing library) to the latest, which fix a compiler bug about optional [6.1.0] - 2019-09-08 move poll wrapper on top of select (only used on Windows) to the ix namespace [6.0.1] - 2019-09-05 add cobra metrics publisher + server unittest add cobra client + server unittest ws snake (cobra simple server) add basic support for unsubscription + subscribe send the proper subscription data + redis client subscription can be cancelled IXCobraConnection / pdu handlers can crash if they receive json data which is not an object [6.0.0] - 2019-09-04 all client autobahn test should pass ! zlib/deflate has a bug with windowsbits == 8, so we silently upgrade it to 9/ (fix autobahn test 13.X which uses 8 for the windows size) [5.2.0] - 2019-09-04 Fragmentation: for sent messages which are compressed, the continuation fragments should not have the rsv1 bit set (fix all autobahn tests for zlib compression 12.X) Websocket Server / do a case insensitive string search when looking for an Upgrade header whose value is websocket. (some client use WebSocket with some upper-case characters) [5.1.9] - 2019-09-03 ws autobahn / report progress with spdlog::info to get timing info ws autobahn / use condition variables for stopping test case + add more logging on errors [5.1.8] - 2019-09-03 Per message deflate/compression: handle fragmented messages (fix autobahn test: 12.1.X and probably others) [5.1.7] - 2019-09-03 Receiving invalid UTF-8 TEXT message should fail and close the connection (fix remaining autobahn test: 6.X UTF-8 Handling) [5.1.6] - 2019-09-03 Sending invalid UTF-8 TEXT message should fail and close the connection (fix remaining autobahn test: 6.X UTF-8 Handling) Fix failing unittest which was sending binary data in text mode with WebSocket::send to call properly call WebSocket::sendBinary instead. Validate that the reason is proper utf-8. (fix autobahn test 7.5.1) Validate close codes. Autobahn 7.9.* [5.1.5] - 2019-09-03 Framentation: data and continuation blocks received out of order (fix autobahn test: 5.9 through 5.20 Fragmentation) [5.1.4] - 2019-09-03 Sending invalid UTF-8 TEXT message should fail and close the connection (fix tons of autobahn test: 6.X UTF-8 Handling) [5.1.3] - 2019-09-03 Message type (TEXT or BINARY) is invalid for received fragmented messages (fix autobahn test: 5.3 through 5.8 Fragmentation) [5.1.2] - 2019-09-02 Ping and Pong messages cannot be fragmented (fix autobahn test: 5.1 and 5.2 Fragmentation) [5.1.1] - 2019-09-01 Close connections when reserved bits are used (fix autobahn test: 3.X Reserved Bits) [5.1.0] - 2019-08-31 ws autobahn / Add code to test websocket client compliance with the autobahn test-suite add utf-8 validation code, not hooked up properly yet Ping received with a payload too large (> 125 bytes) trigger a connection closure cobra / add tracking about published messages cobra / publish returns a message id, that can be used when cobra / new message type in the message received handler when publish/ok is received (can be used to implement an ack system). [5.0.9] - 2019-08-30 User-Agent header is set when not specified. New option to cap the max wait between reconnection attempts. Still default to 10s. (setMaxWaitBetweenReconnectionRetries). ws connect --max_wait 5000 ws://example.com # will only wait 5 seconds max between reconnection attempts [5.0.7] - 2019-08-23 WebSocket: add new option to pass in extra HTTP headers when connecting. ws connect add new option (-H, works like curl ) to pass in extra HTTP headers when connecting If you run against ws echo_server you will see the headers being received printed in the terminal. ws connect -H \"foo: bar\" -H \"baz: buz\" ws://127.0.0.1:8008 CobraConnection: sets a unique id field for all messages sent to cobra . CobraConnection: sets a counter as a field for each event published. [5.0.6] - 2019-08-22 Windows: silly compile error (poll should be in the global namespace) [5.0.5] - 2019-08-22 Windows: use select instead of WSAPoll, through a poll wrapper [5.0.4] - 2019-08-20 Windows build fixes (there was a problem with the use of ::poll that has a different name on Windows (WSAPoll)) [5.0.3] - 2019-08-14 CobraMetricThreadedPublisher _enable flag is an atomic, and CobraMetricsPublisher is enabled by default [5.0.2] - 2019-08-01 ws cobra_subscribe has a new -q (quiet) option ws cobra_subscribe knows to and display msg stats (count and # of messages received per second) ws cobra_subscribe, cobra_to_statsd and cobra_to_sentry commands have a new option, --filter to restrict the events they want to receive [5.0.1] - 2019-07-25 ws connect command has a new option to send in binary mode (still default to text) ws connect command has readline history thanks to libnoise-cpp. Now ws connect one can use using arrows to lookup previous sent messages and edit them [5.0.0] - 2019-06-23 Changed New HTTP server / still very early. ws gained a new command, httpd can run a simple webserver serving local files. IXDNSLookup. Uses weak pointer + smart_ptr + shared_from_this instead of static sets + mutex to handle object going away before dns lookup has resolved cobra_to_sentry / backtraces are reversed and line number is not extracted correctly mbedtls and zlib are searched with find_package, and we use the vendored version if nothing is found travis CI uses g++ on Linux [4.0.0] - 2019-06-09 Changed WebSocket::send() sends message in TEXT mode by default WebSocketMessage sets a new binary field, which tells whether the received incoming message is binary or text WebSocket::send takes a third arg, binary which default to true (can be text too) WebSocket callback only take one object, a const ix::WebSocketMessagePtr& msg Add explicit WebSocket::sendBinary method New headers + WebSocketMessage class to hold message data, still not used across the board Add test/compatibility folder with small servers and clients written in different languages and different libraries to test compatibility. ws echo_server has a -g option to print a greeting message on connect IXSocketMbedTLS: better error handling in close and connect [3.1.2] - 2019-06-06 Added ws connect has a -x option to disable per message deflate Add WebSocket::disablePerMessageDeflate() option. [3.0.0] - 2019-06-xx Changed TLS, aka SSL works on Windows (websocket and http clients) ws command line tool build on Windows Async API for HttpClient HttpClient API changed to use shared_ptr for response and request","title":"Changelog"},{"location":"CHANGELOG/#changelog","text":"All changes to this project will be documented in this file.","title":"Changelog"},{"location":"CHANGELOG/#815-2020-02-23","text":"(server) give thread name to some usual worker threads / unittest is broken !!","title":"[8.1.5] - 2020-02-23"},{"location":"CHANGELOG/#814-2020-02-22","text":"(websocket server) fix regression from 8.1.2, where per-deflate message compression was always disabled","title":"[8.1.4] - 2020-02-22"},{"location":"CHANGELOG/#813-2020-02-21","text":"(client + server) Fix #155 / http header parser should treat the space(s) after the : delimiter as optional. Fixing this bug made us discover that websocket sub-protocols are not properly serialiazed, but start with a ,","title":"[8.1.3] - 2020-02-21"},{"location":"CHANGELOG/#812-2020-02-18","text":"(WebSocketServer) add option to disable deflate compression, exposed with the -x option to ws echo_server","title":"[8.1.2] - 2020-02-18"},{"location":"CHANGELOG/#811-2020-02-18","text":"(ws cobra to statsd and sentry sender) exit if no messages are received for one minute, which is a sign that something goes wrong on the server side. That should be changed to be configurable in the future","title":"[8.1.1] - 2020-02-18"},{"location":"CHANGELOG/#810-2020-02-13","text":"(http client + sentry minidump upload) Multipart stream closing boundary is invalid + mark some options as mandatory in the command line tools","title":"[8.1.0] - 2020-02-13"},{"location":"CHANGELOG/#807-2020-02-12","text":"(build) remove the unused subtree which was causing some way of installing to break","title":"[8.0.7] - 2020-02-12"},{"location":"CHANGELOG/#806-2020-01-31","text":"(snake) add an option to disable answering pongs as response to pings, to test cobra client behavior with hanged connections","title":"[8.0.6] - 2020-01-31"},{"location":"CHANGELOG/#805-2020-01-31","text":"(IXCobraConnection) set a ping timeout of 90 seconds. If no pong messages are received as responses to ping for a while, give up and close the connection","title":"[8.0.5] - 2020-01-31"},{"location":"CHANGELOG/#804-2020-01-31","text":"(cobra to sentry) remove noisy logging","title":"[8.0.4] - 2020-01-31"},{"location":"CHANGELOG/#803-2020-01-30","text":"(ixcobra) check if we are authenticated in publishNext before trying to publish a message","title":"[8.0.3] - 2020-01-30"},{"location":"CHANGELOG/#802-2020-01-28","text":"Extract severity level when emitting messages to sentry","title":"[8.0.2] - 2020-01-28"},{"location":"CHANGELOG/#801-2020-01-28","text":"Fix bug #151 - If a socket connection is interrupted, calling stop() on the IXWebSocket object blocks until the next retry","title":"[8.0.1] - 2020-01-28"},{"location":"CHANGELOG/#800-2020-01-26","text":"(SocketServer) add ability to bind on an ipv6 address","title":"[8.0.0] - 2020-01-26"},{"location":"CHANGELOG/#796-2020-01-22","text":"(ws) add a dnslookup sub-command, to get the ip address of a remote host","title":"[7.9.6] - 2020-01-22"},{"location":"CHANGELOG/#795-2020-01-14","text":"(windows) fix #144, get rid of stubbed/un-implemented windows schannel ssl backend","title":"[7.9.5] - 2020-01-14"},{"location":"CHANGELOG/#794-2020-01-12","text":"(openssl + mbedssl) fix #140, can send large files with ws send over ssl / still broken with apple ssl","title":"[7.9.4] - 2020-01-12"},{"location":"CHANGELOG/#793-2020-01-10","text":"(apple ssl) model write method after the OpenSSL one for consistency","title":"[7.9.3] - 2020-01-10"},{"location":"CHANGELOG/#792-2020-01-06","text":"(apple ssl) unify read and write ssl utility code","title":"[7.9.2] - 2020-01-06"},{"location":"CHANGELOG/#791-2020-01-06","text":"(websocket client) better error propagation when errors are detected while sending data (ws send) detect failures to send big files, terminate in those cases and report error","title":"[7.9.1] - 2020-01-06"},{"location":"CHANGELOG/#790-2020-01-04","text":"(ws send) add option (-x) to disable per message deflate compression","title":"[7.9.0] - 2020-01-04"},{"location":"CHANGELOG/#789-2020-01-04","text":"(ws send + receive) handle all message types (ping + pong + fragment) / investigate #140","title":"[7.8.9] - 2020-01-04"},{"location":"CHANGELOG/#788-2019-12-28","text":"(mbedtls) fix related to private key file parsing and initialization","title":"[7.8.8] - 2019-12-28"},{"location":"CHANGELOG/#786-2019-12-28","text":"(ws cobra to sentry/statsd) fix for handling null events properly for empty queues + use queue to send data to statsd","title":"[7.8.6] - 2019-12-28"},{"location":"CHANGELOG/#785-2019-12-28","text":"(ws cobra to sentry) handle null events for empty queues","title":"[7.8.5] - 2019-12-28"},{"location":"CHANGELOG/#784-2019-12-27","text":"(ws cobra to sentry) game is picked in a fair manner, so that all games get the same share of sent events","title":"[7.8.4] - 2019-12-27"},{"location":"CHANGELOG/#783-2019-12-27","text":"(ws cobra to sentry) refactor queue related code into a class","title":"[7.8.3] - 2019-12-27"},{"location":"CHANGELOG/#782-2019-12-25","text":"(ws cobra to sentry) bound the queue size used to hold up cobra messages before they are sent to sentry. Default queue size is a 100 messages. Without such limit the program runs out of memory when a subscriber receive a lot of messages that cannot make it to sentry","title":"[7.8.2] - 2019-12-25"},{"location":"CHANGELOG/#781-2019-12-25","text":"(ws client) use correct compilation defines so that spdlog is not used as a header only library (reduce binary size and increase compilation speed)","title":"[7.8.1] - 2019-12-25"},{"location":"CHANGELOG/#780-2019-12-24","text":"(ws client) all commands use spdlog instead of std::cerr or std::cout for logging","title":"[7.8.0] - 2019-12-24"},{"location":"CHANGELOG/#765-2019-12-24","text":"(cobra client) send a websocket ping every 30s to keep the connection opened","title":"[7.6.5] - 2019-12-24"},{"location":"CHANGELOG/#764-2019-12-22","text":"(client) error handling, quote url in error case when failing to parse one (ws) ws_cobra_publish: register callbacks before connecting (doc) mention mbedtls in supported ssl server backend","title":"[7.6.4] - 2019-12-22"},{"location":"CHANGELOG/#763-2019-12-20","text":"(tls) add a simple description of the TLS configuration routine for debugging","title":"[7.6.3] - 2019-12-20"},{"location":"CHANGELOG/#762-2019-12-20","text":"(mbedtls) correct support for using own certificate and private key","title":"[7.6.2] - 2019-12-20"},{"location":"CHANGELOG/#761-2019-12-20","text":"(ws commands) in websocket proxy, disable automatic reconnections + in Dockerfile, use alpine 3.11","title":"[7.6.1] - 2019-12-20"},{"location":"CHANGELOG/#760-2019-12-19","text":"(cobra) Add TLS options to all cobra commands and classes. Add example to the doc.","title":"[7.6.0] - 2019-12-19"},{"location":"CHANGELOG/#758-2019-12-18","text":"(cobra-to-sentry) capture application version from device field","title":"[7.5.8] - 2019-12-18"},{"location":"CHANGELOG/#757-2019-12-18","text":"(tls) Experimental TLS server support with mbedtls (windows) + process cert tlsoption (client + server)","title":"[7.5.7] - 2019-12-18"},{"location":"CHANGELOG/#756-2019-12-18","text":"(tls servers) Make it clear that apple ssl and mbedtls backends do not support SSL in server mode","title":"[7.5.6] - 2019-12-18"},{"location":"CHANGELOG/#755-2019-12-17","text":"(tls options client) TLSOptions struct _validated member should be initialized to false","title":"[7.5.5] - 2019-12-17"},{"location":"CHANGELOG/#754-2019-12-16","text":"(websocket client) improve the error message when connecting to a non websocket server Before: Connection error: Got bad status connecting to example.com:443, status: 200, HTTP Status line: HTTP/1.1 200 OK After: Connection error: Expecting status 101 (Switching Protocol), got 200 status connecting to example.com:443, HTTP Status line: HTTP/1.1 200 OK","title":"[7.5.4] - 2019-12-16"},{"location":"CHANGELOG/#753-2019-12-12","text":"(server) attempt at fixing #131 by using blocking writes in server mode","title":"[7.5.3] - 2019-12-12"},{"location":"CHANGELOG/#752-2019-12-11","text":"(ws) cobra to sentry - created events with sentry tags based on tags present in the cobra messages","title":"[7.5.2] - 2019-12-11"},{"location":"CHANGELOG/#751-2019-12-06","text":"(mac) convert SSL errors to utf8","title":"[7.5.1] - 2019-12-06"},{"location":"CHANGELOG/#750-2019-12-05","text":"(ws) cobra to sentry. Handle Error 429 Too Many Requests and politely wait before sending more data to sentry. In the example below sentry we are sending data too fast, sentry asks us to slow down which we do. Notice how the sent count stop increasing, while we are waiting for 41 seconds. [2019-12-05 15:50:33.759] [info] messages received 2449 sent 3 [2019-12-05 15:50:34.759] [info] messages received 5533 sent 7 [2019-12-05 15:50:35.759] [info] messages received 8612 sent 11 [2019-12-05 15:50:36.759] [info] messages received 11562 sent 15 [2019-12-05 15:50:37.759] [info] messages received 14410 sent 19 [2019-12-05 15:50:38.759] [info] messages received 17236 sent 23 [2019-12-05 15:50:39.282] [error] Error sending data to sentry: 429 [2019-12-05 15:50:39.282] [error] Body: {\"exception\":[{\"stacktrace\":{\"frames\":[{\"filename\":\"WorldScene.lua\",\"function\":\"WorldScene.lua:1935\",\"lineno\":1958},{\"filename\":\"WorldScene.lua\",\"function\":\"onUpdate_WorldCam\",\"lineno\":1921},{\"filename\":\"WorldMapTile.lua\",\"function\":\"__index\",\"lineno\":239}]},\"value\":\"noisytypes: Attempt to call nil(nil,2224139838)!\"}],\"platform\":\"python\",\"sdk\":{\"name\":\"ws\",\"version\":\"1.0.0\"},\"tags\":[[\"game\",\"niso\"],[\"userid\",\"107638363\"],[\"environment\",\"live\"]],\"timestamp\":\"2019-12-05T23:50:39Z\"} [2019-12-05 15:50:39.282] [error] Response: {\"error_name\":\"rate_limit\",\"error\":\"Creation of this event was denied due to rate limiting\"} [2019-12-05 15:50:39.282] [warning] Error 429 - Too Many Requests. ws will sleep and retry after 41 seconds [2019-12-05 15:50:39.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:40.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:41.760] [info] messages received 18839 sent 25 [2019-12-05 15:50:42.761] [info] messages received 18839 sent 25 [2019-12-05 15:50:43.762] [info] messages received 18839 sent 25 [2019-12-05 15:50:44.763] [info] messages received 18839 sent 25 [2019-12-05 15:50:45.768] [info] messages received 18839 sent 25","title":"[7.5.0] - 2019-12-05"},{"location":"CHANGELOG/#745-2019-12-03","text":"(ws) #125 / fix build problem when jsoncpp is not installed locally","title":"[7.4.5] - 2019-12-03"},{"location":"CHANGELOG/#744-2019-12-03","text":"(ws) #125 / cmake detects an already installed jsoncpp and will try to use this one if present","title":"[7.4.4] - 2019-12-03"},{"location":"CHANGELOG/#743-2019-12-03","text":"(http client) use std::unordered_map instead of std::map for HttpParameters and HttpFormDataParameters class aliases","title":"[7.4.3] - 2019-12-03"},{"location":"CHANGELOG/#742-2019-12-02","text":"(client) internal IXDNSLookup class requires a valid cancellation request function callback to be passed in","title":"[7.4.2] - 2019-12-02"},{"location":"CHANGELOG/#741-2019-12-02","text":"(client) fix an overflow in the exponential back off code","title":"[7.4.1] - 2019-12-02"},{"location":"CHANGELOG/#740-2019-11-25","text":"(http client) Add support for multipart HTTP POST upload (ixsentry) Add support for uploading a minidump to sentry","title":"[7.4.0] - 2019-11-25"},{"location":"CHANGELOG/#735-2019-11-20","text":"On Darwin SSL, add ability to skip peer verification.","title":"[7.3.5] - 2019-11-20"},{"location":"CHANGELOG/#734-2019-11-20","text":"32-bits compile fix, courtesy of @fcojavmc","title":"[7.3.4] - 2019-11-20"},{"location":"CHANGELOG/#731-2019-11-16","text":"ws proxy_server / remote server close not forwarded to the client","title":"[7.3.1] - 2019-11-16"},{"location":"CHANGELOG/#730-2019-11-15","text":"New ws command: ws proxy_server .","title":"[7.3.0] - 2019-11-15"},{"location":"CHANGELOG/#722-2019-11-01","text":"Tag a release + minor reformating.","title":"[7.2.2] - 2019-11-01"},{"location":"CHANGELOG/#721-2019-10-26","text":"Add unittest to IXSentryClient to lua backtrace parsing code","title":"[7.2.1] - 2019-10-26"},{"location":"CHANGELOG/#720-2019-10-24","text":"Add cobra_metrics_to_redis sub-command to create streams for each cobra metric event being received.","title":"[7.2.0] - 2019-10-24"},{"location":"CHANGELOG/#710-2019-10-13","text":"Add client support for websocket subprotocol. Look for the new addSubProtocol method for details.","title":"[7.1.0] - 2019-10-13"},{"location":"CHANGELOG/#700-2019-10-01","text":"TLS support in server code, only implemented for the OpenSSL SSL backend for now.","title":"[7.0.0] - 2019-10-01"},{"location":"CHANGELOG/#634-2019-09-30","text":"all ws subcommands propagate tls options to servers (unimplemented) or ws or http client (implemented) (contributed by Matt DeBoer)","title":"[6.3.4] - 2019-09-30"},{"location":"CHANGELOG/#633-2019-09-30","text":"ws has a --version option","title":"[6.3.3] - 2019-09-30"},{"location":"CHANGELOG/#632-2019-09-29","text":"(http + websocket clients) can specify cacert and some other tls options (not implemented on all backend). This makes it so that server certs can finally be validated on windows.","title":"[6.3.2] - 2019-09-29"},{"location":"CHANGELOG/#631-2019-09-29","text":"Add ability to use OpenSSL on apple platforms.","title":"[6.3.1] - 2019-09-29"},{"location":"CHANGELOG/#630-2019-09-28","text":"ixcobra / fix crash in CobraConnection::publishNext when the queue is empty + handle CobraConnection_PublishMode_Batch in CobraMetricsThreadedPublisher","title":"[6.3.0] - 2019-09-28"},{"location":"CHANGELOG/#629-2019-09-27","text":"mbedtls fixes / the unittest now pass on macOS, and hopefully will on Windows/AppVeyor as well.","title":"[6.2.9] - 2019-09-27"},{"location":"CHANGELOG/#628-2019-09-26","text":"Http server: add options to ws https to redirect all requests to a given url. POST requests will get a 200 and an empty response. ws httpd -L --redirect_url https://www.google.com","title":"[6.2.8] - 2019-09-26"},{"location":"CHANGELOG/#627-2019-09-25","text":"Stop having ws send subcommand send a binary message in text mode, which would cause error in make ws_test shell script test.","title":"[6.2.7] - 2019-09-25"},{"location":"CHANGELOG/#626-2019-09-24","text":"Fix 2 race conditions detected with TSan, one in CobraMetricsPublisher::push and another one in WebSocketTransport::sendData (that one was bad).","title":"[6.2.6] - 2019-09-24"},{"location":"CHANGELOG/#625-2019-09-23","text":"Add simple Redis Server which is only capable of doing publish / subscribe. New ws redis_server sub-command to use it. The server is used in the unittest, so that we can run on CI in environment where redis isn not available like github actions env.","title":"[6.2.5] - 2019-09-23"},{"location":"CHANGELOG/#624-2019-09-22","text":"Add options to configure TLS ; contributed by Matt DeBoer. Only implemented for OpenSSL TLS backend for now.","title":"[6.2.4] - 2019-09-22"},{"location":"CHANGELOG/#623-2019-09-21","text":"Fix crash in the Linux unittest in the HTTP client code, in Socket::readBytes Cobra Metrics Publisher code returns the message id of the message that got published, to be used to validated that it got sent properly when receiving an ack.","title":"[6.2.3] - 2019-09-21"},{"location":"CHANGELOG/#622-2019-09-19","text":"In DNS lookup code, make sure the weak pointer we use lives through the expected scope (if branch)","title":"[6.2.2] - 2019-09-19"},{"location":"CHANGELOG/#621-2019-09-17","text":"On error while doing a client handshake, additionally display port number next to the host name","title":"[6.2.1] - 2019-09-17"},{"location":"CHANGELOG/#620-2019-09-09","text":"websocket and http server: server does not close the bound client socket in many cases improve some websocket error messages add a utility function with unittest to parse status line and stop using scanf which triggers warnings on Windows update ws CLI11 (our command line argument parsing library) to the latest, which fix a compiler bug about optional","title":"[6.2.0] - 2019-09-09"},{"location":"CHANGELOG/#610-2019-09-08","text":"move poll wrapper on top of select (only used on Windows) to the ix namespace","title":"[6.1.0] - 2019-09-08"},{"location":"CHANGELOG/#601-2019-09-05","text":"add cobra metrics publisher + server unittest add cobra client + server unittest ws snake (cobra simple server) add basic support for unsubscription + subscribe send the proper subscription data + redis client subscription can be cancelled IXCobraConnection / pdu handlers can crash if they receive json data which is not an object","title":"[6.0.1] - 2019-09-05"},{"location":"CHANGELOG/#600-2019-09-04","text":"all client autobahn test should pass ! zlib/deflate has a bug with windowsbits == 8, so we silently upgrade it to 9/ (fix autobahn test 13.X which uses 8 for the windows size)","title":"[6.0.0] - 2019-09-04"},{"location":"CHANGELOG/#520-2019-09-04","text":"Fragmentation: for sent messages which are compressed, the continuation fragments should not have the rsv1 bit set (fix all autobahn tests for zlib compression 12.X) Websocket Server / do a case insensitive string search when looking for an Upgrade header whose value is websocket. (some client use WebSocket with some upper-case characters)","title":"[5.2.0] - 2019-09-04"},{"location":"CHANGELOG/#519-2019-09-03","text":"ws autobahn / report progress with spdlog::info to get timing info ws autobahn / use condition variables for stopping test case + add more logging on errors","title":"[5.1.9] - 2019-09-03"},{"location":"CHANGELOG/#518-2019-09-03","text":"Per message deflate/compression: handle fragmented messages (fix autobahn test: 12.1.X and probably others)","title":"[5.1.8] - 2019-09-03"},{"location":"CHANGELOG/#517-2019-09-03","text":"Receiving invalid UTF-8 TEXT message should fail and close the connection (fix remaining autobahn test: 6.X UTF-8 Handling)","title":"[5.1.7] - 2019-09-03"},{"location":"CHANGELOG/#516-2019-09-03","text":"Sending invalid UTF-8 TEXT message should fail and close the connection (fix remaining autobahn test: 6.X UTF-8 Handling) Fix failing unittest which was sending binary data in text mode with WebSocket::send to call properly call WebSocket::sendBinary instead. Validate that the reason is proper utf-8. (fix autobahn test 7.5.1) Validate close codes. Autobahn 7.9.*","title":"[5.1.6] - 2019-09-03"},{"location":"CHANGELOG/#515-2019-09-03","text":"Framentation: data and continuation blocks received out of order (fix autobahn test: 5.9 through 5.20 Fragmentation)","title":"[5.1.5] - 2019-09-03"},{"location":"CHANGELOG/#514-2019-09-03","text":"Sending invalid UTF-8 TEXT message should fail and close the connection (fix tons of autobahn test: 6.X UTF-8 Handling)","title":"[5.1.4] - 2019-09-03"},{"location":"CHANGELOG/#513-2019-09-03","text":"Message type (TEXT or BINARY) is invalid for received fragmented messages (fix autobahn test: 5.3 through 5.8 Fragmentation)","title":"[5.1.3] - 2019-09-03"},{"location":"CHANGELOG/#512-2019-09-02","text":"Ping and Pong messages cannot be fragmented (fix autobahn test: 5.1 and 5.2 Fragmentation)","title":"[5.1.2] - 2019-09-02"},{"location":"CHANGELOG/#511-2019-09-01","text":"Close connections when reserved bits are used (fix autobahn test: 3.X Reserved Bits)","title":"[5.1.1] - 2019-09-01"},{"location":"CHANGELOG/#510-2019-08-31","text":"ws autobahn / Add code to test websocket client compliance with the autobahn test-suite add utf-8 validation code, not hooked up properly yet Ping received with a payload too large (> 125 bytes) trigger a connection closure cobra / add tracking about published messages cobra / publish returns a message id, that can be used when cobra / new message type in the message received handler when publish/ok is received (can be used to implement an ack system).","title":"[5.1.0] - 2019-08-31"},{"location":"CHANGELOG/#509-2019-08-30","text":"User-Agent header is set when not specified. New option to cap the max wait between reconnection attempts. Still default to 10s. (setMaxWaitBetweenReconnectionRetries). ws connect --max_wait 5000 ws://example.com # will only wait 5 seconds max between reconnection attempts","title":"[5.0.9] - 2019-08-30"},{"location":"CHANGELOG/#507-2019-08-23","text":"WebSocket: add new option to pass in extra HTTP headers when connecting. ws connect add new option (-H, works like curl ) to pass in extra HTTP headers when connecting If you run against ws echo_server you will see the headers being received printed in the terminal. ws connect -H \"foo: bar\" -H \"baz: buz\" ws://127.0.0.1:8008 CobraConnection: sets a unique id field for all messages sent to cobra . CobraConnection: sets a counter as a field for each event published.","title":"[5.0.7] - 2019-08-23"},{"location":"CHANGELOG/#506-2019-08-22","text":"Windows: silly compile error (poll should be in the global namespace)","title":"[5.0.6] - 2019-08-22"},{"location":"CHANGELOG/#505-2019-08-22","text":"Windows: use select instead of WSAPoll, through a poll wrapper","title":"[5.0.5] - 2019-08-22"},{"location":"CHANGELOG/#504-2019-08-20","text":"Windows build fixes (there was a problem with the use of ::poll that has a different name on Windows (WSAPoll))","title":"[5.0.4] - 2019-08-20"},{"location":"CHANGELOG/#503-2019-08-14","text":"CobraMetricThreadedPublisher _enable flag is an atomic, and CobraMetricsPublisher is enabled by default","title":"[5.0.3] - 2019-08-14"},{"location":"CHANGELOG/#502-2019-08-01","text":"ws cobra_subscribe has a new -q (quiet) option ws cobra_subscribe knows to and display msg stats (count and # of messages received per second) ws cobra_subscribe, cobra_to_statsd and cobra_to_sentry commands have a new option, --filter to restrict the events they want to receive","title":"[5.0.2] - 2019-08-01"},{"location":"CHANGELOG/#501-2019-07-25","text":"ws connect command has a new option to send in binary mode (still default to text) ws connect command has readline history thanks to libnoise-cpp. Now ws connect one can use using arrows to lookup previous sent messages and edit them","title":"[5.0.1] - 2019-07-25"},{"location":"CHANGELOG/#500-2019-06-23","text":"","title":"[5.0.0] - 2019-06-23"},{"location":"CHANGELOG/#changed","text":"New HTTP server / still very early. ws gained a new command, httpd can run a simple webserver serving local files. IXDNSLookup. Uses weak pointer + smart_ptr + shared_from_this instead of static sets + mutex to handle object going away before dns lookup has resolved cobra_to_sentry / backtraces are reversed and line number is not extracted correctly mbedtls and zlib are searched with find_package, and we use the vendored version if nothing is found travis CI uses g++ on Linux","title":"Changed"},{"location":"CHANGELOG/#400-2019-06-09","text":"","title":"[4.0.0] - 2019-06-09"},{"location":"CHANGELOG/#changed_1","text":"WebSocket::send() sends message in TEXT mode by default WebSocketMessage sets a new binary field, which tells whether the received incoming message is binary or text WebSocket::send takes a third arg, binary which default to true (can be text too) WebSocket callback only take one object, a const ix::WebSocketMessagePtr& msg Add explicit WebSocket::sendBinary method New headers + WebSocketMessage class to hold message data, still not used across the board Add test/compatibility folder with small servers and clients written in different languages and different libraries to test compatibility. ws echo_server has a -g option to print a greeting message on connect IXSocketMbedTLS: better error handling in close and connect","title":"Changed"},{"location":"CHANGELOG/#312-2019-06-06","text":"","title":"[3.1.2] - 2019-06-06"},{"location":"CHANGELOG/#added","text":"ws connect has a -x option to disable per message deflate Add WebSocket::disablePerMessageDeflate() option.","title":"Added"},{"location":"CHANGELOG/#300-2019-06-xx","text":"","title":"[3.0.0] - 2019-06-xx"},{"location":"CHANGELOG/#changed_2","text":"TLS, aka SSL works on Windows (websocket and http clients) ws command line tool build on Windows Async API for HttpClient HttpClient API changed to use shared_ptr for response and request","title":"Changed"},{"location":"build/","text":"Build CMake CMakefiles for the library and the examples are available. This library has few dependencies, so it is possible to just add the source files into your project. Otherwise the usual way will suffice. mkdir build # make a build dir so that you can build out of tree. cd build cmake -DUSE_TLS=1 .. make -j make install # will install to /usr/local on Unix, on macOS it is a good idea to sudo chown -R `whoami`:staff /usr/local Headers and a static library will be installed to the target dir. There is a unittest which can be executed by typing make test . Options for building: -DUSE_TLS=1 will enable TLS support -DUSE_MBED_TLS=1 will use mbedlts for the TLS support (default on Windows) -DUSE_WS=1 will build the ws interactive command line tool If you are on Windows, look at the appveyor file that has instructions for building dependencies. It is also possible to externally include the project, so that everything is fetched over the wire when you build like so: ExternalProject_Add( IXWebSocket GIT_REPOSITORY https://github.com/machinezone/IXWebSocket.git ... ) vcpkg It is possible to get IXWebSocket through Microsoft vcpkg . vcpkg install ixwebsocket Conan Conan is currently supported through a recipe in Conan Center ( Bintray entry ). Package reference Conan 1.21.0 and up: ixwebsocket/7.9.2 Earlier versions: ixwebsocket/7.9.2@_/_ Note that the version listed here might not be the latest one. See Bintray or the recipe itself for the latest version. If you're migrating from the previous, custom Bintray remote, note that the package reference has to be lower-case. Docker There is a Dockerfile for running the unittest on Linux, and to run the ws tool. It is also available on the docker registry. docker run bsergean/ws To use docker-compose you must make a docker container first. $ make docker ... $ docker compose up & ... $ docker exec -it ixwebsocket_ws_1 bash app@ca2340eb9106:~$ ws --help ws is a websocket tool ...","title":"Build"},{"location":"build/#build","text":"","title":"Build"},{"location":"build/#cmake","text":"CMakefiles for the library and the examples are available. This library has few dependencies, so it is possible to just add the source files into your project. Otherwise the usual way will suffice. mkdir build # make a build dir so that you can build out of tree. cd build cmake -DUSE_TLS=1 .. make -j make install # will install to /usr/local on Unix, on macOS it is a good idea to sudo chown -R `whoami`:staff /usr/local Headers and a static library will be installed to the target dir. There is a unittest which can be executed by typing make test . Options for building: -DUSE_TLS=1 will enable TLS support -DUSE_MBED_TLS=1 will use mbedlts for the TLS support (default on Windows) -DUSE_WS=1 will build the ws interactive command line tool If you are on Windows, look at the appveyor file that has instructions for building dependencies. It is also possible to externally include the project, so that everything is fetched over the wire when you build like so: ExternalProject_Add( IXWebSocket GIT_REPOSITORY https://github.com/machinezone/IXWebSocket.git ... )","title":"CMake"},{"location":"build/#vcpkg","text":"It is possible to get IXWebSocket through Microsoft vcpkg . vcpkg install ixwebsocket","title":"vcpkg"},{"location":"build/#conan","text":"Conan is currently supported through a recipe in Conan Center ( Bintray entry ). Package reference Conan 1.21.0 and up: ixwebsocket/7.9.2 Earlier versions: ixwebsocket/7.9.2@_/_ Note that the version listed here might not be the latest one. See Bintray or the recipe itself for the latest version. If you're migrating from the previous, custom Bintray remote, note that the package reference has to be lower-case.","title":"Conan"},{"location":"build/#docker","text":"There is a Dockerfile for running the unittest on Linux, and to run the ws tool. It is also available on the docker registry. docker run bsergean/ws To use docker-compose you must make a docker container first. $ make docker ... $ docker compose up & ... $ docker exec -it ixwebsocket_ws_1 bash app@ca2340eb9106:~$ ws --help ws is a websocket tool ...","title":"Docker"},{"location":"cobra/","text":"General cobra is a real time messaging server. The ws utility can run a cobra server (named snake), and has client to publish and subscribe to a cobra server. Bring up 3 terminals and run a server, a publisher and a subscriber in each one. As you publish data you should see it being received by the subscriber. You can run redis-cli MONITOR too to see how redis is being used. Server You will need to have a redis server running locally. To run the server: $ cd <ixwebsocket-top-level-folder>/ixsnake/ixsnake $ ws snake { \"apps\": { \"FC2F10139A2BAc53BB72D9db967b024f\": { \"roles\": { \"_sub\": { \"secret\": \"66B1dA3ED5fA074EB5AE84Dd8CE3b5ba\" }, \"_pub\": { \"secret\": \"1c04DB8fFe76A4EeFE3E318C72d771db\" } } } } } redis host: 127.0.0.1 redis password: redis port: 6379 Publisher $ cd <ixwebsocket-top-level-folder>/ws $ ws cobra_publish --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel cobraMetricsSample.json [2019-11-27 09:06:12.980] [info] Publisher connected [2019-11-27 09:06:12.980] [info] Connection: Upgrade [2019-11-27 09:06:12.980] [info] Sec-WebSocket-Accept: zTtQKMKbvwjdivURplYXwCVUCWM= [2019-11-27 09:06:12.980] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-11-27 09:06:12.980] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11 [2019-11-27 09:06:12.980] [info] Upgrade: websocket [2019-11-27 09:06:12.982] [info] Publisher authenticated [2019-11-27 09:06:12.982] [info] Published msg 3 [2019-11-27 09:06:12.982] [info] Published message id 3 acked Subscriber $ ws cobra_subscribe --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel #messages 0 msg/s 0 [2019-11-27 09:07:39.341] [info] Subscriber connected [2019-11-27 09:07:39.341] [info] Connection: Upgrade [2019-11-27 09:07:39.341] [info] Sec-WebSocket-Accept: 9vkQWofz49qMCUlTSptCCwHWm+Q= [2019-11-27 09:07:39.341] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-11-27 09:07:39.341] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11 [2019-11-27 09:07:39.341] [info] Upgrade: websocket [2019-11-27 09:07:39.342] [info] Subscriber authenticated [2019-11-27 09:07:39.345] [info] Subscriber: subscribed to channel test_channel #messages 0 msg/s 0 #messages 0 msg/s 0 #messages 0 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} #messages 1 msg/s 1 #messages 1 msg/s 0 #messages 1 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} {\"baz\":123,\"foo\":\"bar\"} #messages 3 msg/s 2 #messages 3 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} #messages 4 msg/s 1 ^C","title":"Cobra"},{"location":"cobra/#general","text":"cobra is a real time messaging server. The ws utility can run a cobra server (named snake), and has client to publish and subscribe to a cobra server. Bring up 3 terminals and run a server, a publisher and a subscriber in each one. As you publish data you should see it being received by the subscriber. You can run redis-cli MONITOR too to see how redis is being used.","title":"General"},{"location":"cobra/#server","text":"You will need to have a redis server running locally. To run the server: $ cd <ixwebsocket-top-level-folder>/ixsnake/ixsnake $ ws snake { \"apps\": { \"FC2F10139A2BAc53BB72D9db967b024f\": { \"roles\": { \"_sub\": { \"secret\": \"66B1dA3ED5fA074EB5AE84Dd8CE3b5ba\" }, \"_pub\": { \"secret\": \"1c04DB8fFe76A4EeFE3E318C72d771db\" } } } } } redis host: 127.0.0.1 redis password: redis port: 6379","title":"Server"},{"location":"cobra/#publisher","text":"$ cd <ixwebsocket-top-level-folder>/ws $ ws cobra_publish --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel cobraMetricsSample.json [2019-11-27 09:06:12.980] [info] Publisher connected [2019-11-27 09:06:12.980] [info] Connection: Upgrade [2019-11-27 09:06:12.980] [info] Sec-WebSocket-Accept: zTtQKMKbvwjdivURplYXwCVUCWM= [2019-11-27 09:06:12.980] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-11-27 09:06:12.980] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11 [2019-11-27 09:06:12.980] [info] Upgrade: websocket [2019-11-27 09:06:12.982] [info] Publisher authenticated [2019-11-27 09:06:12.982] [info] Published msg 3 [2019-11-27 09:06:12.982] [info] Published message id 3 acked","title":"Publisher"},{"location":"cobra/#subscriber","text":"$ ws cobra_subscribe --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel #messages 0 msg/s 0 [2019-11-27 09:07:39.341] [info] Subscriber connected [2019-11-27 09:07:39.341] [info] Connection: Upgrade [2019-11-27 09:07:39.341] [info] Sec-WebSocket-Accept: 9vkQWofz49qMCUlTSptCCwHWm+Q= [2019-11-27 09:07:39.341] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-11-27 09:07:39.341] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11 [2019-11-27 09:07:39.341] [info] Upgrade: websocket [2019-11-27 09:07:39.342] [info] Subscriber authenticated [2019-11-27 09:07:39.345] [info] Subscriber: subscribed to channel test_channel #messages 0 msg/s 0 #messages 0 msg/s 0 #messages 0 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} #messages 1 msg/s 1 #messages 1 msg/s 0 #messages 1 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} {\"baz\":123,\"foo\":\"bar\"} #messages 3 msg/s 2 #messages 3 msg/s 0 {\"baz\":123,\"foo\":\"bar\"} #messages 4 msg/s 1 ^C","title":"Subscriber"},{"location":"design/","text":"Implementation details Per Message Deflate compression. The per message deflate compression option is supported. It can lead to very nice bandbwith savings (20x !) if your messages are similar, which is often the case for example for chat applications. All features of the spec should be supported. TLS/SSL Connections can be optionally secured and encrypted with TLS/SSL when using a wss:// endpoint, or using normal un-encrypted socket with ws:// endpoints. AppleSSL is used on iOS and macOS, OpenSSL is used on Android and Linux, mbedTLS is used on Windows. Polling and background thread work No manual polling to fetch data is required. Data is sent and received instantly by using a background thread for receiving data and the select system call to be notified by the OS of incoming data. No timeout is used for select so that the background thread is only woken up when data is available, to optimize battery life. This is also the recommended way of using select according to the select tutorial, section select law . Read and Writes to the socket are non blocking. Data is sent right away and not enqueued by writing directly to the socket, which is possible since system socket implementations allow concurrent read/writes. However concurrent writes need to be protected with mutex. Automatic reconnection If the remote end (server) breaks the connection, the code will try to perpetually reconnect, by using an exponential backoff strategy, capped at one retry every 10 seconds. This behavior can be disabled. Large messages Large frames are broken up into smaller chunks or messages to avoid filling up the os tcp buffers, which is permitted thanks to WebSocket fragmentation . Messages up to 1G were sent and received succesfully. Testing The library has an interactive tool which is handy for testing compatibility ith other libraries. We have tested our client against Python, Erlang, Node.js, and C++ websocket server libraries. The unittest tries to be comprehensive, and has been running on multiple platforms, with different sanitizers such as a thread sanitizer to catch data races or the undefined behavior sanitizer. The regression test is running after each commit on travis. Limitations On Windows and Android certificate validation needs to be setup so that SocketTLSOptions.caFile point to a pem file, such as the one distributed by Firefox. Unless that setup is done connecting to a wss endpoint will display an error. On Windows with mbedtls the message will contain error in handshake : X509 - Certificate verification failed, e.g. CRL, CA or signature check failed . There is no convenient way to embed a ca cert. Automatic reconnection works at the TCP socket level, and will detect remote end disconnects. However, if the device/computer network become unreachable (by turning off wifi), it is quite hard to reliably and timely detect it at the socket level using recv and send error codes. Here is a good discussion on the subject. This behavior is consistent with other runtimes such as node.js. One way to detect a disconnected device with low level C code is to do a name resolution with DNS but this can be expensive. Mobile devices have good and reliable API to do that. The server code is using select to detect incoming data, and creates one OS thread per connection. This is not as scalable as strategies using epoll or kqueue. C++ code organization Here is a simplistic diagram which explains how the code is structured in term of class/modules. +-----------------------+ --- Public | | Start the receiving Background thread. Auto reconnection. Simple websocket Ping. | IXWebSocket | Interface used by C++ test clients. No IX dependencies. | | +-----------------------+ | | | IXWebSocketServer | Run a server and give each connections its own WebSocket object. | | Each connection is handled in a new OS thread. | | +-----------------------+ --- Private | | | IXWebSocketTransport | Low level websocket code, framing, managing raw socket. Adapted from easywsclient. | | +-----------------------+ | | | IXWebSocketHandshake | Establish the connection between client and server. | | +-----------------------+ | | | IXWebSocket | ws:// Unencrypted Socket handler | IXWebSocketAppleSSL | wss:// TLS encrypted Socket AppleSSL handler. Used on iOS and macOS | IXWebSocketOpenSSL | wss:// TLS encrypted Socket OpenSSL handler. Used on Android and Linux | | Can be used on macOS too. +-----------------------+ | | | IXSocketConnect | Connect to the remote host (client). | | +-----------------------+ | | | IXDNSLookup | Does DNS resolution asynchronously so that it can be interrupted. | | +-----------------------+","title":"Design"},{"location":"design/#implementation-details","text":"","title":"Implementation details"},{"location":"design/#per-message-deflate-compression","text":"The per message deflate compression option is supported. It can lead to very nice bandbwith savings (20x !) if your messages are similar, which is often the case for example for chat applications. All features of the spec should be supported.","title":"Per Message Deflate compression."},{"location":"design/#tlsssl","text":"Connections can be optionally secured and encrypted with TLS/SSL when using a wss:// endpoint, or using normal un-encrypted socket with ws:// endpoints. AppleSSL is used on iOS and macOS, OpenSSL is used on Android and Linux, mbedTLS is used on Windows.","title":"TLS/SSL"},{"location":"design/#polling-and-background-thread-work","text":"No manual polling to fetch data is required. Data is sent and received instantly by using a background thread for receiving data and the select system call to be notified by the OS of incoming data. No timeout is used for select so that the background thread is only woken up when data is available, to optimize battery life. This is also the recommended way of using select according to the select tutorial, section select law . Read and Writes to the socket are non blocking. Data is sent right away and not enqueued by writing directly to the socket, which is possible since system socket implementations allow concurrent read/writes. However concurrent writes need to be protected with mutex.","title":"Polling and background thread work"},{"location":"design/#automatic-reconnection","text":"If the remote end (server) breaks the connection, the code will try to perpetually reconnect, by using an exponential backoff strategy, capped at one retry every 10 seconds. This behavior can be disabled.","title":"Automatic reconnection"},{"location":"design/#large-messages","text":"Large frames are broken up into smaller chunks or messages to avoid filling up the os tcp buffers, which is permitted thanks to WebSocket fragmentation . Messages up to 1G were sent and received succesfully.","title":"Large messages"},{"location":"design/#testing","text":"The library has an interactive tool which is handy for testing compatibility ith other libraries. We have tested our client against Python, Erlang, Node.js, and C++ websocket server libraries. The unittest tries to be comprehensive, and has been running on multiple platforms, with different sanitizers such as a thread sanitizer to catch data races or the undefined behavior sanitizer. The regression test is running after each commit on travis.","title":"Testing"},{"location":"design/#limitations","text":"On Windows and Android certificate validation needs to be setup so that SocketTLSOptions.caFile point to a pem file, such as the one distributed by Firefox. Unless that setup is done connecting to a wss endpoint will display an error. On Windows with mbedtls the message will contain error in handshake : X509 - Certificate verification failed, e.g. CRL, CA or signature check failed . There is no convenient way to embed a ca cert. Automatic reconnection works at the TCP socket level, and will detect remote end disconnects. However, if the device/computer network become unreachable (by turning off wifi), it is quite hard to reliably and timely detect it at the socket level using recv and send error codes. Here is a good discussion on the subject. This behavior is consistent with other runtimes such as node.js. One way to detect a disconnected device with low level C code is to do a name resolution with DNS but this can be expensive. Mobile devices have good and reliable API to do that. The server code is using select to detect incoming data, and creates one OS thread per connection. This is not as scalable as strategies using epoll or kqueue.","title":"Limitations"},{"location":"design/#c-code-organization","text":"Here is a simplistic diagram which explains how the code is structured in term of class/modules. +-----------------------+ --- Public | | Start the receiving Background thread. Auto reconnection. Simple websocket Ping. | IXWebSocket | Interface used by C++ test clients. No IX dependencies. | | +-----------------------+ | | | IXWebSocketServer | Run a server and give each connections its own WebSocket object. | | Each connection is handled in a new OS thread. | | +-----------------------+ --- Private | | | IXWebSocketTransport | Low level websocket code, framing, managing raw socket. Adapted from easywsclient. | | +-----------------------+ | | | IXWebSocketHandshake | Establish the connection between client and server. | | +-----------------------+ | | | IXWebSocket | ws:// Unencrypted Socket handler | IXWebSocketAppleSSL | wss:// TLS encrypted Socket AppleSSL handler. Used on iOS and macOS | IXWebSocketOpenSSL | wss:// TLS encrypted Socket OpenSSL handler. Used on Android and Linux | | Can be used on macOS too. +-----------------------+ | | | IXSocketConnect | Connect to the remote host (client). | | +-----------------------+ | | | IXDNSLookup | Does DNS resolution asynchronously so that it can be interrupted. | | +-----------------------+","title":"C++ code organization"},{"location":"usage/","text":"Examples The ws folder countains many interactive programs for chat, file transfers , curl like http clients, demonstrating client and server usage. Windows note To use the network system on Windows, you need to initialize it once with WSAStartup() and clean it up with WSACleanup() . We have helpers for that which you can use, see below. This init would typically take place in your main function. #include <ixwebsocket/IXNetSystem.h> int main() { ix::initNetSystem(); ... ix::uninitNetSystem(); return 0; } WebSocket client API #include <ixwebsocket/IXWebSocket.h> ... // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Optional heart beat, sent every 45 seconds when there is not any traffic // to make sure that load balancers do not kill an idle connection. webSocket.setHeartBeatPeriod(45); // Per message deflate connection is enabled by default. You can tweak its parameters or disable it webSocket.disablePerMessageDeflate(); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); // The message can be sent in BINARY mode (useful if you send MsgPack data for example) webSocket.sendBinary(\"some serialized binary data\"); // ... finally ... // Stop the connection webSocket.stop() Sending messages websocket.send(\"foo\") will send a message. If the connection was closed and sending failed, the return value will be set to false. ReadyState getReadyState() returns the state of the connection. There are 4 possible states. ReadyState::Connecting - The connection is not yet open. ReadyState::Open - The connection is open and ready to communicate. ReadyState::Closing - The connection is in the process of closing. ReadyState::Closed - The connection is closed or could not be opened. Open and Close notifications The onMessage event will be fired when the connection is opened or closed. This is similar to the JavaScript browser API , which has open and close events notification that can be registered with the browser addEventListener . webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Open) { std::cout << \"send greetings\" << std::endl; // Headers can be inspected (pairs of string/string) std::cout << \"Handshake Headers:\" << std::endl; for (auto it : msg->headers) { std::cout << it.first << \": \" << it.second << std::endl; } } else if (msg->type == ix::WebSocketMessageType::Close) { std::cout << \"disconnected\" << std::endl; // The server can send an explicit code and reason for closing. // This data can be accessed through the closeInfo object. std::cout << msg->closeInfo.code << std::endl; std::cout << msg->closeInfo.reason << std::endl; } } ); Error notification A message will be fired when there is an error with the connection. The message type will be ix::WebSocketMessageType::Error . Multiple fields will be available on the event to describe the error. webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Error) { std::stringstream ss; ss << \"Error: \" << msg->errorInfo.reason << std::endl; ss << \"#retries: \" << msg->eventInfo.retries << std::endl; ss << \"Wait time(ms): \" << msg->eventInfo.wait_time << std::endl; ss << \"HTTP Status: \" << msg->eventInfo.http_status << std::endl; std::cout << ss.str() << std::endl; } } ); start, stop websocket.start() connect to the remote server and starts the message receiving background thread. websocket.stop() disconnect from the remote server and closes the background thread. Configuring the remote url The url can be set and queried after a websocket object has been created. You will have to call stop and start if you want to disconnect and connect to that new url. std::string url(\"wss://example.com\"); websocket.configure(url); Ping/Pong support Ping/pong messages are used to implement keep-alive. 2 message types exists to identify ping and pong messages. Note that when a ping message is received, a pong is instantly send back as requested by the WebSocket spec. webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Ping || msg->type == ix::WebSocketMessageType::Pong) { std::cout << \"pong data: \" << msg->str << std::endl; } } ); A ping message can be sent to the server, with an optional data string. websocket.ping(\"ping data, optional (empty string is ok): limited to 125 bytes long\"); Heartbeat. You can configure an optional heart beat / keep-alive, sent every 45 seconds when there is no any traffic to make sure that load balancers do not kill an idle connection. webSocket.setHeartBeatPeriod(45); Supply extra HTTP headers. You can set extra HTTP headers to be sent during the WebSocket handshake. WebSocketHttpHeaders headers; headers[\"foo\"] = \"bar\"; webSocket.setExtraHeaders(headers); Subprotocols You can specify subprotocols to be set during the WebSocket handshake. For more info you can refer to this doc . webSocket.addSubprotocol(\"appProtocol-v1\"); webSocket.addSubprotocol(\"appProtocol-v2\"); The protocol that the server did accept is available in the open info protocol field. std::cout << \"protocol: \" << msg->openInfo.protocol << std::endl; Automatic reconnection Automatic reconnection kicks in when the connection is disconnected without the user consent. This feature is on by default and can be turned off. webSocket.enableAutomaticReconnection(); // turn on webSocket.disableAutomaticReconnection(); // turn off bool enabled = webSocket.isAutomaticReconnectionEnabled(); // query state The technique to calculate wait time is called exponential backoff . Here are the default waiting times between attempts (from connecting with ws connect ws://foo.com ) > Connection error: Got bad status connecting to foo.com, status: 301, HTTP Status line: HTTP/1.1 301 Moved Permanently #retries: 1 Wait time(ms): 100 #retries: 2 Wait time(ms): 200 #retries: 3 Wait time(ms): 400 #retries: 4 Wait time(ms): 800 #retries: 5 Wait time(ms): 1600 #retries: 6 Wait time(ms): 3200 #retries: 7 Wait time(ms): 6400 #retries: 8 Wait time(ms): 10000 The waiting time is capped by default at 10s between 2 attempts, but that value can be changed and queried. webSocket.setMaxWaitBetweenReconnectionRetries(5 * 1000); // 5000ms = 5s uint32_t m = webSocket.getMaxWaitBetweenReconnectionRetries(); TLS support and configuration To leverage TLS features, the library must be compiled with the option USE_TLS=1 . Then, secure sockets are automatically used when connecting to a wss://* url. Additional TLS options can be configured by passing a ix::SocketTLSOptions instance to the setTLSOptions on ix::WebSocket (or ix::WebSocketServer or ix::HttpServer ) webSocket.setTLSOptions({ .certFile = \"path/to/cert/file.pem\", .keyFile = \"path/to/key/file.pem\", .caFile = \"path/to/trust/bundle/file.pem\" }); Specifying certFile and keyFile configures the certificate that will be used to communicate with TLS peers. On a client, this is only necessary for connecting to servers that require a client certificate. On a server, this is necessary for TLS support. Specifying caFile configures the trusted roots bundle file (in PEM format) that will be used to verify peer certificates. - The special value of SYSTEM (the default) indicates that the system-configured trust bundle should be used; this is generally what you want when connecting to any publicly exposed API/server. - The special value of NONE can be used to disable peer verification; this is only recommended to rule out certificate verification when testing connectivity. For a client, specifying caFile can be used if connecting to a server that uses a self-signed cert, or when using a custom CA in an internal environment. For a server, specifying caFile implies that: 1. You require clients to present a certificate 1. It must be signed by one of the trusted roots in the file WebSocket server API #include <ixwebsocket/IXWebSocketServer.h> ... // Run a server on localhost at a given port. // Bound host name, max connections and listen backlog can also be passed in as parameters. ix::WebSocketServer server(port); server.setOnConnectionCallback( [&server](std::shared_ptr<WebSocket> webSocket, std::shared_ptr<ConnectionState> connectionState) { webSocket->setOnMessageCallback( [webSocket, connectionState, &server](const ix::WebSocketMessagePtr msg) { if (msg->type == ix::WebSocketMessageType::Open) { std::cerr << \"New connection\" << std::endl; // A connection state object is available, and has a default id // You can subclass ConnectionState and pass an alternate factory // to override it. It is useful if you want to store custom // attributes per connection (authenticated bool flag, attributes, etc...) std::cerr << \"id: \" << connectionState->getId() << std::endl; // The uri the client did connect to. std::cerr << \"Uri: \" << msg->openInfo.uri << std::endl; std::cerr << \"Headers:\" << std::endl; for (auto it : msg->openInfo.headers) { std::cerr << it.first << \": \" << it.second << std::endl; } } else if (msg->type == ix::WebSocketMessageType::Message) { // For an echo server, we just send back to the client whatever was received by the server // All connected clients are available in an std::set. See the broadcast cpp example. // Second parameter tells whether we are sending the message in binary or text mode. // Here we send it in the same mode as it was received. webSocket->send(msg->str, msg->binary); } } ); } ); auto res = server.listen(); if (!res.first) { // Error handling return 1; } // Run the server in the background. Server can be stoped by calling server.stop() server.start(); // Block until server.stop() is called. server.wait(); HTTP client API #include <ixwebsocket/IXHttpClient.h> ... // // Preparation // HttpClient httpClient; HttpRequestArgsPtr args = httpClient.createRequest(); // Custom headers can be set WebSocketHttpHeaders headers; headers[\"Foo\"] = \"bar\"; args->extraHeaders = headers; // Timeout options args->connectTimeout = connectTimeout; args->transferTimeout = transferTimeout; // Redirect options args->followRedirects = followRedirects; args->maxRedirects = maxRedirects; // Misc args->compress = compress; // Enable gzip compression args->verbose = verbose; args->logger = [](const std::string& msg) { std::cout << msg; }; // // Synchronous Request // HttpResponsePtr out; std::string url = \"https://www.google.com\"; // HEAD request out = httpClient.head(url, args); // GET request out = httpClient.get(url, args); // POST request with parameters HttpParameters httpParameters; httpParameters[\"foo\"] = \"bar\"; out = httpClient.post(url, httpParameters, args); // POST request with a body out = httpClient.post(url, std::string(\"foo=bar\"), args); // // Result // auto statusCode = response->statusCode; // Can be HttpErrorCode::Ok, HttpErrorCode::UrlMalformed, etc... auto errorCode = response->errorCode; // 200, 404, etc... auto responseHeaders = response->headers; // All the headers in a special case-insensitive unordered_map of (string, string) auto payload = response->payload; // All the bytes from the response as an std::string auto errorMsg = response->errorMsg; // Descriptive error message in case of failure auto uploadSize = response->uploadSize; // Byte count of uploaded data auto downloadSize = response->downloadSize; // Byte count of downloaded data // // Asynchronous Request // bool async = true; HttpClient httpClient(async); auto args = httpClient.createRequest(url, HttpClient::kGet); // Push the request to a queue, bool ok = httpClient.performRequest(args, [](const HttpResponsePtr& response) { // This callback execute in a background thread. Make sure you uses appropriate protection such as mutex auto statusCode = response->statusCode; // acess results } ); // ok will be false if your httpClient is not async HTTP server API #include <ixwebsocket/IXHttpServer.h> ix::HttpServer server(port, hostname); auto res = server.listen(); if (!res.first) { std::cerr << res.second << std::endl; return 1; } server.start(); server.wait(); If you want to handle how requests are processed, implement the setOnConnectionCallback callback, which takes an HttpRequestPtr as input, and returns an HttpResponsePtr. You can look at HttpServer::setDefaultConnectionCallback for a slightly more advanced callback example. setOnConnectionCallback( [this](HttpRequestPtr request, std::shared_ptr<ConnectionState> /*connectionState*/) -> HttpResponsePtr { // Build a string for the response std::stringstream ss; ss << request->method << \" \" << request->uri; std::string content = ss.str(); return std::make_shared<HttpResponse>(200, \"OK\", HttpErrorCode::Ok, WebSocketHttpHeaders(), content); }","title":"Examples"},{"location":"usage/#examples","text":"The ws folder countains many interactive programs for chat, file transfers , curl like http clients, demonstrating client and server usage.","title":"Examples"},{"location":"usage/#windows-note","text":"To use the network system on Windows, you need to initialize it once with WSAStartup() and clean it up with WSACleanup() . We have helpers for that which you can use, see below. This init would typically take place in your main function. #include <ixwebsocket/IXNetSystem.h> int main() { ix::initNetSystem(); ... ix::uninitNetSystem(); return 0; }","title":"Windows note"},{"location":"usage/#websocket-client-api","text":"#include <ixwebsocket/IXWebSocket.h> ... // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Optional heart beat, sent every 45 seconds when there is not any traffic // to make sure that load balancers do not kill an idle connection. webSocket.setHeartBeatPeriod(45); // Per message deflate connection is enabled by default. You can tweak its parameters or disable it webSocket.disablePerMessageDeflate(); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); // The message can be sent in BINARY mode (useful if you send MsgPack data for example) webSocket.sendBinary(\"some serialized binary data\"); // ... finally ... // Stop the connection webSocket.stop()","title":"WebSocket client API"},{"location":"usage/#sending-messages","text":"websocket.send(\"foo\") will send a message. If the connection was closed and sending failed, the return value will be set to false.","title":"Sending messages"},{"location":"usage/#readystate","text":"getReadyState() returns the state of the connection. There are 4 possible states. ReadyState::Connecting - The connection is not yet open. ReadyState::Open - The connection is open and ready to communicate. ReadyState::Closing - The connection is in the process of closing. ReadyState::Closed - The connection is closed or could not be opened.","title":"ReadyState"},{"location":"usage/#open-and-close-notifications","text":"The onMessage event will be fired when the connection is opened or closed. This is similar to the JavaScript browser API , which has open and close events notification that can be registered with the browser addEventListener . webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Open) { std::cout << \"send greetings\" << std::endl; // Headers can be inspected (pairs of string/string) std::cout << \"Handshake Headers:\" << std::endl; for (auto it : msg->headers) { std::cout << it.first << \": \" << it.second << std::endl; } } else if (msg->type == ix::WebSocketMessageType::Close) { std::cout << \"disconnected\" << std::endl; // The server can send an explicit code and reason for closing. // This data can be accessed through the closeInfo object. std::cout << msg->closeInfo.code << std::endl; std::cout << msg->closeInfo.reason << std::endl; } } );","title":"Open and Close notifications"},{"location":"usage/#error-notification","text":"A message will be fired when there is an error with the connection. The message type will be ix::WebSocketMessageType::Error . Multiple fields will be available on the event to describe the error. webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Error) { std::stringstream ss; ss << \"Error: \" << msg->errorInfo.reason << std::endl; ss << \"#retries: \" << msg->eventInfo.retries << std::endl; ss << \"Wait time(ms): \" << msg->eventInfo.wait_time << std::endl; ss << \"HTTP Status: \" << msg->eventInfo.http_status << std::endl; std::cout << ss.str() << std::endl; } } );","title":"Error notification"},{"location":"usage/#start-stop","text":"websocket.start() connect to the remote server and starts the message receiving background thread. websocket.stop() disconnect from the remote server and closes the background thread.","title":"start, stop"},{"location":"usage/#configuring-the-remote-url","text":"The url can be set and queried after a websocket object has been created. You will have to call stop and start if you want to disconnect and connect to that new url. std::string url(\"wss://example.com\"); websocket.configure(url);","title":"Configuring the remote url"},{"location":"usage/#pingpong-support","text":"Ping/pong messages are used to implement keep-alive. 2 message types exists to identify ping and pong messages. Note that when a ping message is received, a pong is instantly send back as requested by the WebSocket spec. webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Ping || msg->type == ix::WebSocketMessageType::Pong) { std::cout << \"pong data: \" << msg->str << std::endl; } } ); A ping message can be sent to the server, with an optional data string. websocket.ping(\"ping data, optional (empty string is ok): limited to 125 bytes long\");","title":"Ping/Pong support"},{"location":"usage/#heartbeat","text":"You can configure an optional heart beat / keep-alive, sent every 45 seconds when there is no any traffic to make sure that load balancers do not kill an idle connection. webSocket.setHeartBeatPeriod(45);","title":"Heartbeat."},{"location":"usage/#supply-extra-http-headers","text":"You can set extra HTTP headers to be sent during the WebSocket handshake. WebSocketHttpHeaders headers; headers[\"foo\"] = \"bar\"; webSocket.setExtraHeaders(headers);","title":"Supply extra HTTP headers."},{"location":"usage/#subprotocols","text":"You can specify subprotocols to be set during the WebSocket handshake. For more info you can refer to this doc . webSocket.addSubprotocol(\"appProtocol-v1\"); webSocket.addSubprotocol(\"appProtocol-v2\"); The protocol that the server did accept is available in the open info protocol field. std::cout << \"protocol: \" << msg->openInfo.protocol << std::endl;","title":"Subprotocols"},{"location":"usage/#automatic-reconnection","text":"Automatic reconnection kicks in when the connection is disconnected without the user consent. This feature is on by default and can be turned off. webSocket.enableAutomaticReconnection(); // turn on webSocket.disableAutomaticReconnection(); // turn off bool enabled = webSocket.isAutomaticReconnectionEnabled(); // query state The technique to calculate wait time is called exponential backoff . Here are the default waiting times between attempts (from connecting with ws connect ws://foo.com ) > Connection error: Got bad status connecting to foo.com, status: 301, HTTP Status line: HTTP/1.1 301 Moved Permanently #retries: 1 Wait time(ms): 100 #retries: 2 Wait time(ms): 200 #retries: 3 Wait time(ms): 400 #retries: 4 Wait time(ms): 800 #retries: 5 Wait time(ms): 1600 #retries: 6 Wait time(ms): 3200 #retries: 7 Wait time(ms): 6400 #retries: 8 Wait time(ms): 10000 The waiting time is capped by default at 10s between 2 attempts, but that value can be changed and queried. webSocket.setMaxWaitBetweenReconnectionRetries(5 * 1000); // 5000ms = 5s uint32_t m = webSocket.getMaxWaitBetweenReconnectionRetries();","title":"Automatic reconnection"},{"location":"usage/#tls-support-and-configuration","text":"To leverage TLS features, the library must be compiled with the option USE_TLS=1 . Then, secure sockets are automatically used when connecting to a wss://* url. Additional TLS options can be configured by passing a ix::SocketTLSOptions instance to the setTLSOptions on ix::WebSocket (or ix::WebSocketServer or ix::HttpServer ) webSocket.setTLSOptions({ .certFile = \"path/to/cert/file.pem\", .keyFile = \"path/to/key/file.pem\", .caFile = \"path/to/trust/bundle/file.pem\" }); Specifying certFile and keyFile configures the certificate that will be used to communicate with TLS peers. On a client, this is only necessary for connecting to servers that require a client certificate. On a server, this is necessary for TLS support. Specifying caFile configures the trusted roots bundle file (in PEM format) that will be used to verify peer certificates. - The special value of SYSTEM (the default) indicates that the system-configured trust bundle should be used; this is generally what you want when connecting to any publicly exposed API/server. - The special value of NONE can be used to disable peer verification; this is only recommended to rule out certificate verification when testing connectivity. For a client, specifying caFile can be used if connecting to a server that uses a self-signed cert, or when using a custom CA in an internal environment. For a server, specifying caFile implies that: 1. You require clients to present a certificate 1. It must be signed by one of the trusted roots in the file","title":"TLS support and configuration"},{"location":"usage/#websocket-server-api","text":"#include <ixwebsocket/IXWebSocketServer.h> ... // Run a server on localhost at a given port. // Bound host name, max connections and listen backlog can also be passed in as parameters. ix::WebSocketServer server(port); server.setOnConnectionCallback( [&server](std::shared_ptr<WebSocket> webSocket, std::shared_ptr<ConnectionState> connectionState) { webSocket->setOnMessageCallback( [webSocket, connectionState, &server](const ix::WebSocketMessagePtr msg) { if (msg->type == ix::WebSocketMessageType::Open) { std::cerr << \"New connection\" << std::endl; // A connection state object is available, and has a default id // You can subclass ConnectionState and pass an alternate factory // to override it. It is useful if you want to store custom // attributes per connection (authenticated bool flag, attributes, etc...) std::cerr << \"id: \" << connectionState->getId() << std::endl; // The uri the client did connect to. std::cerr << \"Uri: \" << msg->openInfo.uri << std::endl; std::cerr << \"Headers:\" << std::endl; for (auto it : msg->openInfo.headers) { std::cerr << it.first << \": \" << it.second << std::endl; } } else if (msg->type == ix::WebSocketMessageType::Message) { // For an echo server, we just send back to the client whatever was received by the server // All connected clients are available in an std::set. See the broadcast cpp example. // Second parameter tells whether we are sending the message in binary or text mode. // Here we send it in the same mode as it was received. webSocket->send(msg->str, msg->binary); } } ); } ); auto res = server.listen(); if (!res.first) { // Error handling return 1; } // Run the server in the background. Server can be stoped by calling server.stop() server.start(); // Block until server.stop() is called. server.wait();","title":"WebSocket server API"},{"location":"usage/#http-client-api","text":"#include <ixwebsocket/IXHttpClient.h> ... // // Preparation // HttpClient httpClient; HttpRequestArgsPtr args = httpClient.createRequest(); // Custom headers can be set WebSocketHttpHeaders headers; headers[\"Foo\"] = \"bar\"; args->extraHeaders = headers; // Timeout options args->connectTimeout = connectTimeout; args->transferTimeout = transferTimeout; // Redirect options args->followRedirects = followRedirects; args->maxRedirects = maxRedirects; // Misc args->compress = compress; // Enable gzip compression args->verbose = verbose; args->logger = [](const std::string& msg) { std::cout << msg; }; // // Synchronous Request // HttpResponsePtr out; std::string url = \"https://www.google.com\"; // HEAD request out = httpClient.head(url, args); // GET request out = httpClient.get(url, args); // POST request with parameters HttpParameters httpParameters; httpParameters[\"foo\"] = \"bar\"; out = httpClient.post(url, httpParameters, args); // POST request with a body out = httpClient.post(url, std::string(\"foo=bar\"), args); // // Result // auto statusCode = response->statusCode; // Can be HttpErrorCode::Ok, HttpErrorCode::UrlMalformed, etc... auto errorCode = response->errorCode; // 200, 404, etc... auto responseHeaders = response->headers; // All the headers in a special case-insensitive unordered_map of (string, string) auto payload = response->payload; // All the bytes from the response as an std::string auto errorMsg = response->errorMsg; // Descriptive error message in case of failure auto uploadSize = response->uploadSize; // Byte count of uploaded data auto downloadSize = response->downloadSize; // Byte count of downloaded data // // Asynchronous Request // bool async = true; HttpClient httpClient(async); auto args = httpClient.createRequest(url, HttpClient::kGet); // Push the request to a queue, bool ok = httpClient.performRequest(args, [](const HttpResponsePtr& response) { // This callback execute in a background thread. Make sure you uses appropriate protection such as mutex auto statusCode = response->statusCode; // acess results } ); // ok will be false if your httpClient is not async","title":"HTTP client API"},{"location":"usage/#http-server-api","text":"#include <ixwebsocket/IXHttpServer.h> ix::HttpServer server(port, hostname); auto res = server.listen(); if (!res.first) { std::cerr << res.second << std::endl; return 1; } server.start(); server.wait(); If you want to handle how requests are processed, implement the setOnConnectionCallback callback, which takes an HttpRequestPtr as input, and returns an HttpResponsePtr. You can look at HttpServer::setDefaultConnectionCallback for a slightly more advanced callback example. setOnConnectionCallback( [this](HttpRequestPtr request, std::shared_ptr<ConnectionState> /*connectionState*/) -> HttpResponsePtr { // Build a string for the response std::stringstream ss; ss << request->method << \" \" << request->uri; std::string content = ss.str(); return std::make_shared<HttpResponse>(200, \"OK\", HttpErrorCode::Ok, WebSocketHttpHeaders(), content); }","title":"HTTP server API"},{"location":"ws/","text":"General ws is a command line tool that should exercise most of the IXWebSocket code, and provide example code. ws is a websocket tool Usage: ws [OPTIONS] SUBCOMMAND Options: -h,--help Print this help message and exit Subcommands: send Send a file receive Receive a file transfer Broadcasting server connect Connect to a remote server chat Group chat echo_server Echo server broadcast_server Broadcasting server ping Ping pong curl HTTP Client redis_publish Redis publisher redis_subscribe Redis subscriber cobra_subscribe Cobra subscriber cobra_publish Cobra publisher cobra_to_statsd Cobra to statsd cobra_to_sentry Cobra to sentry snake Snake server httpd HTTP server curl The curl subcommand try to be compatible with the curl syntax, to fetch http pages. Making a HEAD request with the -I parameter. $ ws curl -I https://www.google.com/ Accept-Ranges: none Alt-Svc: quic=\":443\"; ma=2592000; v=\"46,43\",h3-Q048=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000 Cache-Control: private, max-age=0 Content-Type: text/html; charset=ISO-8859-1 Date: Tue, 08 Oct 2019 21:36:57 GMT Expires: -1 P3P: CP=\"This is not a P3P policy! See g.co/p3phelp for more info.\" Server: gws Set-Cookie: NID=188=ASwfz8GrXQrHCLqAz-AndLOMLcz0rC9yecnf3h0yXZxRL3rTufTU_GDDwERp7qQL7LZ_EB8gCRyPXGERyOSAgaqgnrkoTmvWrwFemRLMaOZ896GrHobi5fV7VLklnSG2w48Gj8xMlwxfP7Z-bX-xR9UZxep1tHM6UmFQdD_GkBE; expires=Wed, 08-Apr-2020 21:36:57 GMT; path=/; domain=.google.com; HttpOnly Transfer-Encoding: chunked Vary: Accept-Encoding X-Frame-Options: SAMEORIGIN X-XSS-Protection: 0 Upload size: 143 Download size: 0 Status: 200 Making a POST request with the -F parameter. $ ws curl -F foo=bar https://httpbin.org/post foo: bar Downloaded 438 bytes out of 438 Access-Control-Allow-Credentials: true Access-Control-Allow-Origin: * Connection: keep-alive Content-Encoding: Content-Length: 438 Content-Type: application/json Date: Tue, 08 Oct 2019 21:47:54 GMT Referrer-Policy: no-referrer-when-downgrade Server: nginx X-Content-Type-Options: nosniff X-Frame-Options: DENY X-XSS-Protection: 1; mode=block Upload size: 219 Download size: 438 Status: 200 payload: { \"args\": {}, \"data\": \"\", \"files\": {}, \"form\": { \"foo\": \"bar\" }, \"headers\": { \"Accept\": \"*/*\", \"Content-Length\": \"7\", \"Content-Type\": \"application/x-www-form-urlencoded\", \"Host\": \"httpbin.org\", \"User-Agent\": \"ixwebsocket/7.0.0 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11\" }, \"json\": null, \"origin\": \"155.94.127.118, 155.94.127.118\", \"url\": \"https://httpbin.org/post\" } Passing in a custom header with -H. $ ws curl -F foo=bar -H 'my_custom_header: baz' https://httpbin.org/post my_custom_header: baz foo: bar Downloaded 470 bytes out of 470 Access-Control-Allow-Credentials: true Access-Control-Allow-Origin: * Connection: keep-alive Content-Encoding: Content-Length: 470 Content-Type: application/json Date: Tue, 08 Oct 2019 21:50:25 GMT Referrer-Policy: no-referrer-when-downgrade Server: nginx X-Content-Type-Options: nosniff X-Frame-Options: DENY X-XSS-Protection: 1; mode=block Upload size: 243 Download size: 470 Status: 200 payload: { \"args\": {}, \"data\": \"\", \"files\": {}, \"form\": { \"foo\": \"bar\" }, \"headers\": { \"Accept\": \"*/*\", \"Content-Length\": \"7\", \"Content-Type\": \"application/x-www-form-urlencoded\", \"Host\": \"httpbin.org\", \"My-Custom-Header\": \"baz\", \"User-Agent\": \"ixwebsocket/7.0.0 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11\" }, \"json\": null, \"origin\": \"155.94.127.118, 155.94.127.118\", \"url\": \"https://httpbin.org/post\" } connect The connect command connects to a websocket endpoint, and starts an interactive prompt. Line editing, such as using the direction keys to fetch the last thing you tried to type) is provided. That command is pretty useful to try to send random data to an endpoint and verify that the service handles it with grace (such as sending invalid json). ws connect wss://echo.websocket.org Type Ctrl-D to exit prompt... Connecting to url: wss://echo.websocket.org > ws_connect: connected Uri: / Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:38:44 GMT Sec-WebSocket-Accept: 2j6LBScZveqrMx1W/GJkCWvZo3M= sec-websocket-extensions: Server: Kaazing Gateway Upgrade: websocket Received ping Received ping Received ping Hello world ! > Received 13 bytes ws_connect: received message: Hello world ! > Hello world ! > Received 13 bytes ws_connect: received message: Hello world ! ws connect 'ws://jeanserge.com/v2?appkey=_pubsub' Type Ctrl-D to exit prompt... Connecting to url: ws://jeanserge.com/v2?appkey=_pubsub > ws_connect: connected Uri: /v2?appkey=_pubsub Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:45:28 GMT Sec-WebSocket-Accept: LYHmjh9Gsu/Yw7aumQqyPObOEV4= Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Server: Python/3.7 websockets/8.0.2 Upgrade: websocket bababababababab > ws_connect: connection closed: code 1000 reason ws_connect: connected Uri: /v2?appkey=_pubsub Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:45:44 GMT Sec-WebSocket-Accept: I1rqxdLgTU+opPi5/zKPBTuXdLw= Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Server: Python/3.7 websockets/8.0.2 Upgrade: websocket Websocket proxy ws proxy_server --remote_host ws://127.0.0.1:9000 -v Listening on 127.0.0.1:8008 If you connect to ws://127.0.0.1:8008, the proxy will connect to ws://127.0.0.1:9000 and pass all traffic to this server. File transfer # Start transfer server, which is just a broadcast server at this point ws transfer # running on port 8080. # Start receiver first ws receive ws://localhost:8080 # Then send a file. File will be received and written to disk by the receiver process ws send ws://localhost:8080 /file/to/path HTTP Client $ ws curl --help HTTP Client Usage: ws curl [OPTIONS] url Positionals: url TEXT REQUIRED Connection url Options: -h,--help Print this help message and exit -d TEXT Form data -F TEXT Form data -H TEXT Header --output TEXT Output file -I Send a HEAD request -L Follow redirects --max-redirects INT Max Redirects -v Verbose -O Save output to disk --compress Enable gzip compression --connect-timeout INT Connection timeout --transfer-timeout INT Transfer timeout Cobra client and server cobra is a real time messenging server. ws has several sub-command to interact with cobra. There is also a minimal cobra compatible server named snake available. Below are examples on running a snake server and clients with TLS enabled (the server only works with the OpenSSL and the Mbed TLS backend for now). First, generate certificates. $ cd /path/to/IXWebSocket $ cd ixsnake/ixsnake $ bash ../../ws/generate_certs.sh Generating RSA private key, 2048 bit long modulus .....+++ .................+++ e is 65537 (0x10001) generated ./.certs/trusted-ca-key.pem generated ./.certs/trusted-ca-crt.pem Generating RSA private key, 2048 bit long modulus ..+++ .......................................+++ e is 65537 (0x10001) generated ./.certs/trusted-server-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=trusted-server Getting CA Private Key generated ./.certs/trusted-server-crt.pem Generating RSA private key, 2048 bit long modulus ...................................+++ ..................................................+++ e is 65537 (0x10001) generated ./.certs/trusted-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=trusted-client Getting CA Private Key generated ./.certs/trusted-client-crt.pem Generating RSA private key, 2048 bit long modulus ..............+++ .......................................+++ e is 65537 (0x10001) generated ./.certs/untrusted-ca-key.pem generated ./.certs/untrusted-ca-crt.pem Generating RSA private key, 2048 bit long modulus ..........+++ ................................................+++ e is 65537 (0x10001) generated ./.certs/untrusted-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=untrusted-client Getting CA Private Key generated ./.certs/untrusted-client-crt.pem Generating RSA private key, 2048 bit long modulus .....................................................................................+++ ...........+++ e is 65537 (0x10001) generated ./.certs/selfsigned-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=selfsigned-client Getting Private key generated ./.certs/selfsigned-client-crt.pem Now run the snake server. $ export certs=.certs $ ws snake --tls --port 8765 --cert-file ${certs}/trusted-server-crt.pem --key-file ${certs}/trusted-server-key.pem --ca-file ${certs}/trusted-ca-crt.pem { \"apps\": { \"FC2F10139A2BAc53BB72D9db967b024f\": { \"roles\": { \"_sub\": { \"secret\": \"66B1dA3ED5fA074EB5AE84Dd8CE3b5ba\" }, \"_pub\": { \"secret\": \"1c04DB8fFe76A4EeFE3E318C72d771db\" } } } } } redis host: 127.0.0.1 redis password: redis port: 6379 As a new connection comes in, such output should be printed [2019-12-19 20:27:19.724] [info] New connection id: 0 Uri: /v2?appkey=_health Headers: Connection: Upgrade Host: 127.0.0.1:8765 Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Sec-WebSocket-Key: d747B0fE61Db73f7Eh47c0== Sec-WebSocket-Protocol: json Sec-WebSocket-Version: 13 Upgrade: websocket User-Agent: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11 To connect and publish a message, do: $ export certs=.certs $ cd /path/to/ws/folder $ ls cobraMetricsSample.json cobraMetricsSample.json $ ws cobra_publish --endpoint wss://127.0.0.1:8765 --appkey FC2F10139A2BAc53BB72D9db967b024f --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db --channel foo --cert-file ${certs}/trusted-client-crt.pem --key-file ${certs}/trusted-client-key.pem --ca-file ${certs}/trusted-ca-crt.pem cobraMetricsSample.json [2019-12-19 20:46:42.656] [info] Publisher connected [2019-12-19 20:46:42.657] [info] Connection: Upgrade [2019-12-19 20:46:42.657] [info] Sec-WebSocket-Accept: rs99IFThoBrhSg+k8G4ixH9yaq4= [2019-12-19 20:46:42.657] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-12-19 20:46:42.657] [info] Server: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11 [2019-12-19 20:46:42.657] [info] Upgrade: websocket [2019-12-19 20:46:42.658] [info] Publisher authenticated [2019-12-19 20:46:42.658] [info] Published msg 3 [2019-12-19 20:46:42.659] [info] Published message id 3 acked To use OpenSSL on macOS, compile with make ws_openssl . First you will have to install OpenSSL libraries, which can be done with Homebrew. Use make ws_mbedtls accordingly to use MbedTLS.","title":"Ws"},{"location":"ws/#general","text":"ws is a command line tool that should exercise most of the IXWebSocket code, and provide example code. ws is a websocket tool Usage: ws [OPTIONS] SUBCOMMAND Options: -h,--help Print this help message and exit Subcommands: send Send a file receive Receive a file transfer Broadcasting server connect Connect to a remote server chat Group chat echo_server Echo server broadcast_server Broadcasting server ping Ping pong curl HTTP Client redis_publish Redis publisher redis_subscribe Redis subscriber cobra_subscribe Cobra subscriber cobra_publish Cobra publisher cobra_to_statsd Cobra to statsd cobra_to_sentry Cobra to sentry snake Snake server httpd HTTP server","title":"General"},{"location":"ws/#curl","text":"The curl subcommand try to be compatible with the curl syntax, to fetch http pages. Making a HEAD request with the -I parameter. $ ws curl -I https://www.google.com/ Accept-Ranges: none Alt-Svc: quic=\":443\"; ma=2592000; v=\"46,43\",h3-Q048=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000 Cache-Control: private, max-age=0 Content-Type: text/html; charset=ISO-8859-1 Date: Tue, 08 Oct 2019 21:36:57 GMT Expires: -1 P3P: CP=\"This is not a P3P policy! See g.co/p3phelp for more info.\" Server: gws Set-Cookie: NID=188=ASwfz8GrXQrHCLqAz-AndLOMLcz0rC9yecnf3h0yXZxRL3rTufTU_GDDwERp7qQL7LZ_EB8gCRyPXGERyOSAgaqgnrkoTmvWrwFemRLMaOZ896GrHobi5fV7VLklnSG2w48Gj8xMlwxfP7Z-bX-xR9UZxep1tHM6UmFQdD_GkBE; expires=Wed, 08-Apr-2020 21:36:57 GMT; path=/; domain=.google.com; HttpOnly Transfer-Encoding: chunked Vary: Accept-Encoding X-Frame-Options: SAMEORIGIN X-XSS-Protection: 0 Upload size: 143 Download size: 0 Status: 200 Making a POST request with the -F parameter. $ ws curl -F foo=bar https://httpbin.org/post foo: bar Downloaded 438 bytes out of 438 Access-Control-Allow-Credentials: true Access-Control-Allow-Origin: * Connection: keep-alive Content-Encoding: Content-Length: 438 Content-Type: application/json Date: Tue, 08 Oct 2019 21:47:54 GMT Referrer-Policy: no-referrer-when-downgrade Server: nginx X-Content-Type-Options: nosniff X-Frame-Options: DENY X-XSS-Protection: 1; mode=block Upload size: 219 Download size: 438 Status: 200 payload: { \"args\": {}, \"data\": \"\", \"files\": {}, \"form\": { \"foo\": \"bar\" }, \"headers\": { \"Accept\": \"*/*\", \"Content-Length\": \"7\", \"Content-Type\": \"application/x-www-form-urlencoded\", \"Host\": \"httpbin.org\", \"User-Agent\": \"ixwebsocket/7.0.0 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11\" }, \"json\": null, \"origin\": \"155.94.127.118, 155.94.127.118\", \"url\": \"https://httpbin.org/post\" } Passing in a custom header with -H. $ ws curl -F foo=bar -H 'my_custom_header: baz' https://httpbin.org/post my_custom_header: baz foo: bar Downloaded 470 bytes out of 470 Access-Control-Allow-Credentials: true Access-Control-Allow-Origin: * Connection: keep-alive Content-Encoding: Content-Length: 470 Content-Type: application/json Date: Tue, 08 Oct 2019 21:50:25 GMT Referrer-Policy: no-referrer-when-downgrade Server: nginx X-Content-Type-Options: nosniff X-Frame-Options: DENY X-XSS-Protection: 1; mode=block Upload size: 243 Download size: 470 Status: 200 payload: { \"args\": {}, \"data\": \"\", \"files\": {}, \"form\": { \"foo\": \"bar\" }, \"headers\": { \"Accept\": \"*/*\", \"Content-Length\": \"7\", \"Content-Type\": \"application/x-www-form-urlencoded\", \"Host\": \"httpbin.org\", \"My-Custom-Header\": \"baz\", \"User-Agent\": \"ixwebsocket/7.0.0 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11\" }, \"json\": null, \"origin\": \"155.94.127.118, 155.94.127.118\", \"url\": \"https://httpbin.org/post\" }","title":"curl"},{"location":"ws/#connect","text":"The connect command connects to a websocket endpoint, and starts an interactive prompt. Line editing, such as using the direction keys to fetch the last thing you tried to type) is provided. That command is pretty useful to try to send random data to an endpoint and verify that the service handles it with grace (such as sending invalid json). ws connect wss://echo.websocket.org Type Ctrl-D to exit prompt... Connecting to url: wss://echo.websocket.org > ws_connect: connected Uri: / Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:38:44 GMT Sec-WebSocket-Accept: 2j6LBScZveqrMx1W/GJkCWvZo3M= sec-websocket-extensions: Server: Kaazing Gateway Upgrade: websocket Received ping Received ping Received ping Hello world ! > Received 13 bytes ws_connect: received message: Hello world ! > Hello world ! > Received 13 bytes ws_connect: received message: Hello world ! ws connect 'ws://jeanserge.com/v2?appkey=_pubsub' Type Ctrl-D to exit prompt... Connecting to url: ws://jeanserge.com/v2?appkey=_pubsub > ws_connect: connected Uri: /v2?appkey=_pubsub Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:45:28 GMT Sec-WebSocket-Accept: LYHmjh9Gsu/Yw7aumQqyPObOEV4= Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Server: Python/3.7 websockets/8.0.2 Upgrade: websocket bababababababab > ws_connect: connection closed: code 1000 reason ws_connect: connected Uri: /v2?appkey=_pubsub Handshake Headers: Connection: Upgrade Date: Tue, 08 Oct 2019 21:45:44 GMT Sec-WebSocket-Accept: I1rqxdLgTU+opPi5/zKPBTuXdLw= Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Server: Python/3.7 websockets/8.0.2 Upgrade: websocket","title":"connect"},{"location":"ws/#websocket-proxy","text":"ws proxy_server --remote_host ws://127.0.0.1:9000 -v Listening on 127.0.0.1:8008 If you connect to ws://127.0.0.1:8008, the proxy will connect to ws://127.0.0.1:9000 and pass all traffic to this server.","title":"Websocket proxy"},{"location":"ws/#file-transfer","text":"# Start transfer server, which is just a broadcast server at this point ws transfer # running on port 8080. # Start receiver first ws receive ws://localhost:8080 # Then send a file. File will be received and written to disk by the receiver process ws send ws://localhost:8080 /file/to/path","title":"File transfer"},{"location":"ws/#http-client","text":"$ ws curl --help HTTP Client Usage: ws curl [OPTIONS] url Positionals: url TEXT REQUIRED Connection url Options: -h,--help Print this help message and exit -d TEXT Form data -F TEXT Form data -H TEXT Header --output TEXT Output file -I Send a HEAD request -L Follow redirects --max-redirects INT Max Redirects -v Verbose -O Save output to disk --compress Enable gzip compression --connect-timeout INT Connection timeout --transfer-timeout INT Transfer timeout","title":"HTTP Client"},{"location":"ws/#cobra-client-and-server","text":"cobra is a real time messenging server. ws has several sub-command to interact with cobra. There is also a minimal cobra compatible server named snake available. Below are examples on running a snake server and clients with TLS enabled (the server only works with the OpenSSL and the Mbed TLS backend for now). First, generate certificates. $ cd /path/to/IXWebSocket $ cd ixsnake/ixsnake $ bash ../../ws/generate_certs.sh Generating RSA private key, 2048 bit long modulus .....+++ .................+++ e is 65537 (0x10001) generated ./.certs/trusted-ca-key.pem generated ./.certs/trusted-ca-crt.pem Generating RSA private key, 2048 bit long modulus ..+++ .......................................+++ e is 65537 (0x10001) generated ./.certs/trusted-server-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=trusted-server Getting CA Private Key generated ./.certs/trusted-server-crt.pem Generating RSA private key, 2048 bit long modulus ...................................+++ ..................................................+++ e is 65537 (0x10001) generated ./.certs/trusted-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=trusted-client Getting CA Private Key generated ./.certs/trusted-client-crt.pem Generating RSA private key, 2048 bit long modulus ..............+++ .......................................+++ e is 65537 (0x10001) generated ./.certs/untrusted-ca-key.pem generated ./.certs/untrusted-ca-crt.pem Generating RSA private key, 2048 bit long modulus ..........+++ ................................................+++ e is 65537 (0x10001) generated ./.certs/untrusted-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=untrusted-client Getting CA Private Key generated ./.certs/untrusted-client-crt.pem Generating RSA private key, 2048 bit long modulus .....................................................................................+++ ...........+++ e is 65537 (0x10001) generated ./.certs/selfsigned-client-key.pem Signature ok subject=/O=machinezone/O=IXWebSocket/CN=selfsigned-client Getting Private key generated ./.certs/selfsigned-client-crt.pem Now run the snake server. $ export certs=.certs $ ws snake --tls --port 8765 --cert-file ${certs}/trusted-server-crt.pem --key-file ${certs}/trusted-server-key.pem --ca-file ${certs}/trusted-ca-crt.pem { \"apps\": { \"FC2F10139A2BAc53BB72D9db967b024f\": { \"roles\": { \"_sub\": { \"secret\": \"66B1dA3ED5fA074EB5AE84Dd8CE3b5ba\" }, \"_pub\": { \"secret\": \"1c04DB8fFe76A4EeFE3E318C72d771db\" } } } } } redis host: 127.0.0.1 redis password: redis port: 6379 As a new connection comes in, such output should be printed [2019-12-19 20:27:19.724] [info] New connection id: 0 Uri: /v2?appkey=_health Headers: Connection: Upgrade Host: 127.0.0.1:8765 Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 Sec-WebSocket-Key: d747B0fE61Db73f7Eh47c0== Sec-WebSocket-Protocol: json Sec-WebSocket-Version: 13 Upgrade: websocket User-Agent: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11 To connect and publish a message, do: $ export certs=.certs $ cd /path/to/ws/folder $ ls cobraMetricsSample.json cobraMetricsSample.json $ ws cobra_publish --endpoint wss://127.0.0.1:8765 --appkey FC2F10139A2BAc53BB72D9db967b024f --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db --channel foo --cert-file ${certs}/trusted-client-crt.pem --key-file ${certs}/trusted-client-key.pem --ca-file ${certs}/trusted-ca-crt.pem cobraMetricsSample.json [2019-12-19 20:46:42.656] [info] Publisher connected [2019-12-19 20:46:42.657] [info] Connection: Upgrade [2019-12-19 20:46:42.657] [info] Sec-WebSocket-Accept: rs99IFThoBrhSg+k8G4ixH9yaq4= [2019-12-19 20:46:42.657] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15 [2019-12-19 20:46:42.657] [info] Server: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11 [2019-12-19 20:46:42.657] [info] Upgrade: websocket [2019-12-19 20:46:42.658] [info] Publisher authenticated [2019-12-19 20:46:42.658] [info] Published msg 3 [2019-12-19 20:46:42.659] [info] Published message id 3 acked To use OpenSSL on macOS, compile with make ws_openssl . First you will have to install OpenSSL libraries, which can be done with Homebrew. Use make ws_mbedtls accordingly to use MbedTLS.","title":"Cobra client and server"}]}
\ No newline at end of file
diff --git a/sitemap.xml b/sitemap.xml
index 85563da1..94b47181 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -1,38 +1,31 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
-    <url>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><url>
      <loc>None</loc>
-     <lastmod>2020-02-12</lastmod>
+     <lastmod>2020-02-23</lastmod>
      <changefreq>daily</changefreq>
-    </url>
-    <url>
+    </url><url>
      <loc>None</loc>
-     <lastmod>2020-02-12</lastmod>
+     <lastmod>2020-02-23</lastmod>
      <changefreq>daily</changefreq>
-    </url>
-    <url>
+    </url><url>
      <loc>None</loc>
-     <lastmod>2020-02-12</lastmod>
+     <lastmod>2020-02-23</lastmod>
      <changefreq>daily</changefreq>
-    </url>
-    <url>
+    </url><url>
      <loc>None</loc>
-     <lastmod>2020-02-12</lastmod>
+     <lastmod>2020-02-23</lastmod>
      <changefreq>daily</changefreq>
-    </url>
-    <url>
+    </url><url>
      <loc>None</loc>
-     <lastmod>2020-02-12</lastmod>
+     <lastmod>2020-02-23</lastmod>
      <changefreq>daily</changefreq>
-    </url>
-    <url>
+    </url><url>
      <loc>None</loc>
-     <lastmod>2020-02-12</lastmod>
+     <lastmod>2020-02-23</lastmod>
      <changefreq>daily</changefreq>
-    </url>
-    <url>
+    </url><url>
      <loc>None</loc>
-     <lastmod>2020-02-12</lastmod>
+     <lastmod>2020-02-23</lastmod>
      <changefreq>daily</changefreq>
     </url>
 </urlset>
\ No newline at end of file
diff --git a/sitemap.xml.gz b/sitemap.xml.gz
index 95b97032..0f63f3f5 100644
Binary files a/sitemap.xml.gz and b/sitemap.xml.gz differ
diff --git a/usage/index.html b/usage/index.html
index cb9ce214..db9ba8c3 100644
--- a/usage/index.html
+++ b/usage/index.html
@@ -9,79 +9,66 @@
         
         <link rel="shortcut icon" href="../img/favicon.ico">
         <title>Examples - IXWebSocket</title>
-        <link href="../css/bootstrap-custom.min.css" rel="stylesheet">
+        <link href="../css/bootstrap.min.css" rel="stylesheet">
         <link href="../css/font-awesome.min.css" rel="stylesheet">
         <link href="../css/base.css" rel="stylesheet">
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css">
-        <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
-        <!--[if lt IE 9]>
-            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
-            <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
-        <![endif]-->
 
         <script src="../js/jquery-1.10.2.min.js" defer></script>
-        <script src="../js/bootstrap-3.0.3.min.js" defer></script>
+        <script src="../js/bootstrap.min.js" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
         <script>hljs.initHighlightingOnLoad();</script> 
     </head>
 
     <body>
-
-        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+        <div class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
             <div class="container">
-
-                <!-- Collapsed navigation -->
-                <div class="navbar-header">
-                    <!-- Expander button -->
-                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-                        <span class="sr-only">Toggle navigation</span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                    </button>
-                    <a class="navbar-brand" href="..">IXWebSocket</a>
-                </div>
+                <a class="navbar-brand" href="..">IXWebSocket</a>
+                <!-- Expander button -->
+                <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbar-collapse">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
 
                 <!-- Expanded navigation -->
-                <div class="navbar-collapse collapse">
+                <div id="navbar-collapse" class="navbar-collapse collapse">
                         <!-- Main navigation -->
                         <ul class="nav navbar-nav">
-                            <li >
-                                <a href="..">Home</a>
+                            <li class="navitem">
+                                <a href=".." class="nav-link">Home</a>
                             </li>
-                            <li >
-                                <a href="../CHANGELOG/">Changelog</a>
+                            <li class="navitem">
+                                <a href="../CHANGELOG/" class="nav-link">Changelog</a>
                             </li>
-                            <li >
-                                <a href="../build/">Build</a>
+                            <li class="navitem">
+                                <a href="../build/" class="nav-link">Build</a>
                             </li>
-                            <li >
-                                <a href="../cobra/">Cobra</a>
+                            <li class="navitem">
+                                <a href="../cobra/" class="nav-link">Cobra</a>
                             </li>
-                            <li >
-                                <a href="../design/">Design</a>
+                            <li class="navitem">
+                                <a href="../design/" class="nav-link">Design</a>
                             </li>
-                            <li class="active">
-                                <a href="./">Examples</a>
+                            <li class="navitem active">
+                                <a href="./" class="nav-link">Examples</a>
                             </li>
-                            <li >
-                                <a href="../ws/">Ws</a>
+                            <li class="navitem">
+                                <a href="../ws/" class="nav-link">Ws</a>
                             </li>
                         </ul>
 
-                    <ul class="nav navbar-nav navbar-right">
-                        <li>
-                            <a href="#" data-toggle="modal" data-target="#mkdocs_search_modal">
+                    <ul class="nav navbar-nav ml-auto">
+                        <li class="nav-item">
+                            <a href="#" class="nav-link" data-toggle="modal" data-target="#mkdocs_search_modal">
                                 <i class="fa fa-search"></i> Search
                             </a>
                         </li>
-                            <li >
-                                <a rel="next" href="../design/">
+                            <li class="nav-item">
+                                <a rel="prev" href="../design/" class="nav-link">
                                     <i class="fa fa-arrow-left"></i> Previous
                                 </a>
                             </li>
-                            <li >
-                                <a rel="prev" href="../ws/">
+                            <li class="nav-item">
+                                <a rel="next" href="../ws/" class="nav-link">
                                     Next <i class="fa fa-arrow-right"></i>
                                 </a>
                             </li>
@@ -91,17 +78,46 @@
         </div>
 
         <div class="container">
-                <div class="col-md-3"><div class="bs-sidebar hidden-print affix well" role="complementary">
-    <ul class="nav bs-sidenav">
-        <li class="main active"><a href="#examples">Examples</a></li>
-            <li><a href="#windows-note">Windows note</a></li>
-            <li><a href="#websocket-client-api">WebSocket client API</a></li>
-            <li><a href="#websocket-server-api">WebSocket server API</a></li>
-            <li><a href="#http-client-api">HTTP client API</a></li>
-            <li><a href="#http-server-api">HTTP server API</a></li>
-    </ul>
+            <div class="row">
+                    <div class="col-md-3"><div class="navbar-light navbar-expand-md bs-sidebar hidden-print affix" role="complementary">
+    <div class="navbar-header">
+        <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#toc-collapse" title="Table of Contents">
+            <span class="fa fa-angle-down"></span>
+        </button>
+    </div>
+
+    
+    <div id="toc-collapse" class="navbar-collapse collapse card bg-secondary">
+        <ul class="nav flex-column">
+            
+            <li class="nav-item" data-level="1"><a href="#examples" class="nav-link">Examples</a>
+              <ul class="nav flex-column">
+            <li class="nav-item" data-level="2"><a href="#windows-note" class="nav-link">Windows note</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#websocket-client-api" class="nav-link">WebSocket client API</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#websocket-server-api" class="nav-link">WebSocket server API</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#http-client-api" class="nav-link">HTTP client API</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            <li class="nav-item" data-level="2"><a href="#http-server-api" class="nav-link">HTTP server API</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+              </ul>
+            </li>
+        </ul>
+    </div>
 </div></div>
-                <div class="col-md-9" role="main">
+                    <div class="col-md-9" role="main">
 
 <h1 id="examples">Examples</h1>
 <p>The <a href="https://github.com/machinezone/IXWebSocket/tree/master/ws"><em>ws</em></a> folder countains many interactive programs for chat, <a href="https://github.com/machinezone/IXWebSocket/blob/master/ws/ws_send.cpp">file transfers</a>, <a href="https://github.com/machinezone/IXWebSocket/blob/master/ws/ws_http_client.cpp">curl like</a> http clients, demonstrating client and server usage.</p>
@@ -507,6 +523,7 @@ server.wait();
                                               content);
 }
 </code></pre></div>
+            </div>
         </div>
 
         <footer class="col-md-12">
@@ -520,19 +537,19 @@ server.wait();
         <script src="../js/base.js" defer></script>
         <script src="../search/main.js" defer></script>
 
-        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="Search Modal" aria-hidden="true">
-    <div class="modal-dialog">
+        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="searchModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="searchModalLabel">Search</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Search</h4>
             </div>
             <div class="modal-body">
                 <p>
                     From here you can search these documents. Enter
                     your search terms below.
                 </p>
-                <form role="form">
+                <form>
                     <div class="form-group">
                         <input type="text" class="form-control" placeholder="Search..." id="mkdocs-search-query" title="Type search term here">
                     </div>
@@ -543,12 +560,12 @@ server.wait();
             </div>
         </div>
     </div>
-</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="Keyboard Shortcuts Modal" aria-hidden="true">
+</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="keyboardModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="keyboardModalLabel">Keyboard Shortcuts</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Keyboard Shortcuts</h4>
             </div>
             <div class="modal-body">
               <table class="table">
diff --git a/ws/index.html b/ws/index.html
index 6c5391db..f79be692 100644
--- a/ws/index.html
+++ b/ws/index.html
@@ -9,79 +9,66 @@
         
         <link rel="shortcut icon" href="../img/favicon.ico">
         <title>Ws - IXWebSocket</title>
-        <link href="../css/bootstrap-custom.min.css" rel="stylesheet">
+        <link href="../css/bootstrap.min.css" rel="stylesheet">
         <link href="../css/font-awesome.min.css" rel="stylesheet">
         <link href="../css/base.css" rel="stylesheet">
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css">
-        <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
-        <!--[if lt IE 9]>
-            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
-            <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
-        <![endif]-->
 
         <script src="../js/jquery-1.10.2.min.js" defer></script>
-        <script src="../js/bootstrap-3.0.3.min.js" defer></script>
+        <script src="../js/bootstrap.min.js" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
         <script>hljs.initHighlightingOnLoad();</script> 
     </head>
 
     <body>
-
-        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+        <div class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
             <div class="container">
-
-                <!-- Collapsed navigation -->
-                <div class="navbar-header">
-                    <!-- Expander button -->
-                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-                        <span class="sr-only">Toggle navigation</span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                        <span class="icon-bar"></span>
-                    </button>
-                    <a class="navbar-brand" href="..">IXWebSocket</a>
-                </div>
+                <a class="navbar-brand" href="..">IXWebSocket</a>
+                <!-- Expander button -->
+                <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#navbar-collapse">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
 
                 <!-- Expanded navigation -->
-                <div class="navbar-collapse collapse">
+                <div id="navbar-collapse" class="navbar-collapse collapse">
                         <!-- Main navigation -->
                         <ul class="nav navbar-nav">
-                            <li >
-                                <a href="..">Home</a>
+                            <li class="navitem">
+                                <a href=".." class="nav-link">Home</a>
                             </li>
-                            <li >
-                                <a href="../CHANGELOG/">Changelog</a>
+                            <li class="navitem">
+                                <a href="../CHANGELOG/" class="nav-link">Changelog</a>
                             </li>
-                            <li >
-                                <a href="../build/">Build</a>
+                            <li class="navitem">
+                                <a href="../build/" class="nav-link">Build</a>
                             </li>
-                            <li >
-                                <a href="../cobra/">Cobra</a>
+                            <li class="navitem">
+                                <a href="../cobra/" class="nav-link">Cobra</a>
                             </li>
-                            <li >
-                                <a href="../design/">Design</a>
+                            <li class="navitem">
+                                <a href="../design/" class="nav-link">Design</a>
                             </li>
-                            <li >
-                                <a href="../usage/">Examples</a>
+                            <li class="navitem">
+                                <a href="../usage/" class="nav-link">Examples</a>
                             </li>
-                            <li class="active">
-                                <a href="./">Ws</a>
+                            <li class="navitem active">
+                                <a href="./" class="nav-link">Ws</a>
                             </li>
                         </ul>
 
-                    <ul class="nav navbar-nav navbar-right">
-                        <li>
-                            <a href="#" data-toggle="modal" data-target="#mkdocs_search_modal">
+                    <ul class="nav navbar-nav ml-auto">
+                        <li class="nav-item">
+                            <a href="#" class="nav-link" data-toggle="modal" data-target="#mkdocs_search_modal">
                                 <i class="fa fa-search"></i> Search
                             </a>
                         </li>
-                            <li >
-                                <a rel="next" href="../usage/">
+                            <li class="nav-item">
+                                <a rel="prev" href="../usage/" class="nav-link">
                                     <i class="fa fa-arrow-left"></i> Previous
                                 </a>
                             </li>
-                            <li class="disabled">
-                                <a rel="prev" >
+                            <li class="nav-item">
+                                <a rel="next" class="nav-link disabled">
                                     Next <i class="fa fa-arrow-right"></i>
                                 </a>
                             </li>
@@ -91,18 +78,56 @@
         </div>
 
         <div class="container">
-                <div class="col-md-3"><div class="bs-sidebar hidden-print affix well" role="complementary">
-    <ul class="nav bs-sidenav">
-        <li class="main active"><a href="#general">General</a></li>
-        <li class="main "><a href="#curl">curl</a></li>
-        <li class="main "><a href="#connect">connect</a></li>
-        <li class="main "><a href="#websocket-proxy">Websocket proxy</a></li>
-        <li class="main "><a href="#file-transfer">File transfer</a></li>
-        <li class="main "><a href="#http-client">HTTP Client</a></li>
-        <li class="main "><a href="#cobra-client-and-server">Cobra client and server</a></li>
-    </ul>
+            <div class="row">
+                    <div class="col-md-3"><div class="navbar-light navbar-expand-md bs-sidebar hidden-print affix" role="complementary">
+    <div class="navbar-header">
+        <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#toc-collapse" title="Table of Contents">
+            <span class="fa fa-angle-down"></span>
+        </button>
+    </div>
+
+    
+    <div id="toc-collapse" class="navbar-collapse collapse card bg-secondary">
+        <ul class="nav flex-column">
+            
+            <li class="nav-item" data-level="2"><a href="#general" class="nav-link">General</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#curl" class="nav-link">curl</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#connect" class="nav-link">connect</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#websocket-proxy" class="nav-link">Websocket proxy</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#file-transfer" class="nav-link">File transfer</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#http-client" class="nav-link">HTTP Client</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+            
+            <li class="nav-item" data-level="2"><a href="#cobra-client-and-server" class="nav-link">Cobra client and server</a>
+              <ul class="nav flex-column">
+              </ul>
+            </li>
+        </ul>
+    </div>
 </div></div>
-                <div class="col-md-9" role="main">
+                    <div class="col-md-9" role="main">
 
 <h2 id="general">General</h2>
 <p>ws is a command line tool that should exercise most of the IXWebSocket code, and provide example code.</p>
@@ -440,6 +465,7 @@ $ ws cobra_publish --endpoint wss://127.0.0.1:8765 --appkey FC2F10139A2BAc53BB72
 </code></pre>
 
 <p>To use OpenSSL on macOS, compile with <code>make ws_openssl</code>. First you will have to install OpenSSL libraries, which can be done with Homebrew. Use <code>make ws_mbedtls</code> accordingly to use MbedTLS.</p></div>
+            </div>
         </div>
 
         <footer class="col-md-12">
@@ -453,19 +479,19 @@ $ ws cobra_publish --endpoint wss://127.0.0.1:8765 --appkey FC2F10139A2BAc53BB72
         <script src="../js/base.js" defer></script>
         <script src="../search/main.js" defer></script>
 
-        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="Search Modal" aria-hidden="true">
-    <div class="modal-dialog">
+        <div class="modal" id="mkdocs_search_modal" tabindex="-1" role="dialog" aria-labelledby="searchModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="searchModalLabel">Search</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Search</h4>
             </div>
             <div class="modal-body">
                 <p>
                     From here you can search these documents. Enter
                     your search terms below.
                 </p>
-                <form role="form">
+                <form>
                     <div class="form-group">
                         <input type="text" class="form-control" placeholder="Search..." id="mkdocs-search-query" title="Type search term here">
                     </div>
@@ -476,12 +502,12 @@ $ ws cobra_publish --endpoint wss://127.0.0.1:8765 --appkey FC2F10139A2BAc53BB72
             </div>
         </div>
     </div>
-</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="Keyboard Shortcuts Modal" aria-hidden="true">
+</div><div class="modal" id="mkdocs_keyboard_modal" tabindex="-1" role="dialog" aria-labelledby="keyboardModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
+                <h4 class="modal-title" id="keyboardModalLabel">Keyboard Shortcuts</h4>
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                <h4 class="modal-title" id="exampleModalLabel">Keyboard Shortcuts</h4>
             </div>
             <div class="modal-body">
               <table class="table">
