app.js

var express = require('express');
var app = module.exports = express.createServer();
var io = require('socket.io').listen(app);

io.configure('development', function(){
    io.set('log level', 1);
    io.set('transports', ['xhr-polling', 'websocket']);
});

io.configure('production', function(){
    io.set('log level', 1);
    io.set('transports', ['websocket', 'xhr-polling']);
});