gistfile1.js

var express = require('express')
  , http = require('http')
  , path = require('path');

var app = express();

// all environments
app.set('port', process.env.PORT || 3000);

app.post('/', function(req,res){
    res.header("Access-Control-Allow-Origin","*");
    res.header("Access-Control-Allow-Headers","X-Requested-With");
    res.header("Access-Control-Allow-Methods","GET, POST");

    res.send({"hello":"world"})
})

app.options('*', function(req,res){
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');
    res.send(200);
});


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