close and stop with code and reason + docker = ubuntu xenial

ixwebsocket/IXWebSocket.h

@@ -99,8 +99,10 @@ namespace ix
 
         // Run asynchronously, by calling start and stop.
         void start();
+
         // stop is synchronous
-        void stop();
+        void stop(uint16_t code = 1000,
+                  const std::string& reason = "Normal closure");
 
         // Run in blocking mode, by connecting first manually, and then calling run.
         WebSocketInitResult connect(int timeoutSecs);
@@ -112,7 +114,9 @@ namespace ix
         WebSocketSendInfo sendText(const std::string& text,
                                    const OnProgressCallback& onProgressCallback = nullptr);
         WebSocketSendInfo ping(const std::string& text);
-        void close();
+
+        void close(uint16_t code = 1000,
+                   const std::string& reason = "Normal closure");
 
         // Set callback to receive websocket messages.
         // Be aware: your callback will be executed from websocket's internal thread!