Server handling mechanism for WebSocket client disconnection

For the client in the form of webpage, press F5 to refresh, and the server catches the Disconnect event:

socket.on('disconnect'.function(){ 
    log.info("disconnect");
    eventEmitter.emit('close',socket);
  });
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In the context of the event handler, the socket structure gets the following information:

_events: The events listened on the socket and the corresponding handler.

Connected: disconnected – Socket connection state bit

With this socket ID, the server can do the corresponding destructor to release the resources corresponding to the connection.

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