http://www.websocket.org/aboutwebsocket.html
180 - https://github.com/socketio/engine.io/blob/49362abcd0c176ed0f8621bc70820a8adf9859b2/lib/socket.js 383 - https://github.com/socketio/engine.io/blob/2abb217e26fb58e49c2590d74b2aae36dbe365cc/lib/server.js