node.js server_starter (Express + Socket.IO)

var app = require('express')();
 
 var __dirname = "./public/"
 
 /* serves main page */
 app.get("/", function(req, res) {
    res.sendfile( __dirname +'index.html');
 });
 
  app.post("/user/add", function(req, res) { 
	/* some server side logic */
	res.send("OK");
  });
 
 /* serves all the static files */
 app.get(/^(.+)$/, function(req, res){ 
     console.log('static file request : ' + req.params);
     res.sendfile( __dirname + req.params[0]); 
 });
 
 var port = process.env.PORT || 5000;
 var server = app.listen(port, function() {
   console.log("Listening on " + port);
 });
 

 var io = require('socket.io').listen(server);
 io.on('connection', function(){
    console.log('New Socket Client !'); 
 });