nodejs websocket detect disconnected socket

Question

I have a nodejs websocket server and I have the following problem.

When my clients connect to the server and terminate gracefully the onclose method is

Answer 1

Well I'll try to answer your question with two examples. Try to analyze both of them and learn how they work. They are both tested and working.

1- Websocket:

Server:

var WebSocketServer = require('websocket').server;
var http = require('http');

var server = http.createServer(function(request, response) {
    console.log((new Date()) + ' Received request for ' + request.url);
    response.writeHead(404);
    response.end();
});
server.listen(3000, function() {
    console.log((new Date()) + ' Server is listening on port 3000');
});

wsServer = new WebSocketServer({
    httpServer: server,
    autoAcceptConnections: false
});

function originIsAllowed(origin) {
  return true;
}

wsServer.on('request', function(request) {
    if (!originIsAllowed(request.origin)) {
      request.reject();
      console.log((new Date()) + ' Connection from origin ' + request.origin + ' rejected.');
      return;
    }

    var connection = request.accept('echo-protocol', request.origin);
    console.log((new Date()) + ' Connection accepted.');
    connection.on('message', function(message) {
        if (message.type === 'utf8') {
            console.log('Received Message: ' + message.utf8Data);
            connection.sendUTF(message.utf8Data);
        }
        else if (message.type === 'binary') {
            console.log('Received Binary Message of ' + message.binaryData.length + ' bytes');
            connection.sendBytes(message.binaryData);
        }
    });
    connection.on('close', function(reasonCode, description) {
        console.log((new Date()) + ' Peer ' + connection.remoteAddress + ' disconnected.');
    });
});

Client:

2- Socket.io:

Server:

var http = require('http');
    var app = require('express')();
    var httpServer = http.createServer(app)
    var io = require('socket.io')(httpServer);

app.get('/', function(req, res) {
    res.sendfile(__dirname + '/index.html');
});

io.on('connection', function(socket) {
    socket.emit('news', {
        hello: 'world'
    });
    socket.on('my other event', function(data) {
        console.log(data);
    });
    socket.on('disconnect', function(data) {
        console.log('disconnect!');
    });
});

httpServer.listen(3000);

Client: