Adding CORS support in expressjs app

app.js

var express 	= require('express')
  , routes 		= require('./modules/analytics/routes')
  , http 		= require('http')
  , path 		= require('path');





var app = express();


// all environments
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));



// development only
if ('development' == app.get('env')) {
  	app.use(express.errorHandler());
}


// CORS in express
app.all('*', function(req, res, next){

	if (!req.get('Origin')) return next();
	// use "*" here to accept any origin
	res.set('Access-Control-Allow-Origin', 'http://localhost:4000'); // add your domain name here, to allow cross origin
	res.set('Access-Control-Allow-Methods'
		, 'X-Requested-With, Content-Type');
	// res.set('Access-Control-Allow-Max-Age', 3600);
	if ('OPTIONS' == req.method) return res.send(200);
	next();
});






http.createServer(app).listen(app.get('port'), function(){
  console.log('Express server listening on port ' + app.get('port'));
});