(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.h

@@ -118,7 +118,7 @@ namespace ix
     {
     public:
         static std::tuple<bool, std::string, HttpRequestPtr> parseRequest(
-            std::unique_ptr<Socket>& socket);
+            std::unique_ptr<Socket>& socket, int timeoutSecs);
         static bool sendResponse(HttpResponsePtr response, std::unique_ptr<Socket>& socket);
 
         static std::pair<std::string, int> parseStatusLine(const std::string& line);