(http server) read body request when the Content-Length is specified + set timeout to read the request to 30 seconds max by default, and make it configurable as a constructor parameter

ixwebsocket/IXHttp.cpp

@@ -93,14 +93,12 @@ namespace ix
     }
 
     std::tuple<bool, std::string, HttpRequestPtr> Http::parseRequest(
-        std::unique_ptr<Socket>& socket)
+        std::unique_ptr<Socket>& socket, int timeoutSecs)
     {
         HttpRequestPtr httpRequest;
 
         std::atomic<bool> requestInitCancellation(false);
 
-        int timeoutSecs = 5; // FIXME
-
         auto isCancellationRequested =
             makeCancellationRequestWithTimeout(timeoutSecs, requestInitCancellation);