(WebSocket) The ability to send ping control frame and receive pong in IWebSocket (Online module)

Hello there. It seems UE4 WebSocket library doesn’t support sending ping or receiving pong (RFC 6455 Section 5.5.2). The library I am talking about Engine/Source/Runtime/Online/WebSockets/Public/IWebSocket.h. It uses, and in libwebsocket it’s LWS_WRITE_PING. To stop the server from closing the connection, we have to send a blank text/binary frame instead of ping control frame. I don’t think this is a good idea. Also, the pong control frames received from the server are ignored, instead of handled by the user.