Socket.IO and Express server listening on the same port

On Scalingo, your application must listen to the port defined in the PORT environment variable the platform dynamically defines.

If your application uses both a HTTP server and a WebSocket, you can configure it to use the same port. Here is a snippet to do that with an Express server and Socket.IO for the WebSocket part:

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

app.use(express.static(__dirname + '/node_modules'));
app.get('/', function(req, res,next) {
   res.sendFile(__dirname + '/index.html');

server.listen(process.env.PORT || 4200);

io.on('connection', function(client) {
   console.log('Client connected...');

   client.on('join', function(data) {

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