JSONP Vs. CORS

client_cors.js

// http://jsfiddle.net/suBPQ/

$.ajax({
    url: "http://api_test_server.proudlygeek.c9.io/",
    success: function(data) {
        console.log(data);    
    }
});​

client_jsonp.js

// http://jsfiddle.net/sWaSP/​

$.ajax({
    url: "http://api_test_server.proudlygeek.c9.io/?callback=?",
    dataType: "jsonp",
    success: function(data) {
        console.log(data);    
    }
});​​​​​​​​​​​​​​​​​​

server_cors.js

// http://api_test_server.proudlygeek.c9.io/

var http = require("http"),
    url  = require("url");

var server = http.createServer(function(req, res) {
    console.log(req.headers);
    
    var data = {
        'name': "Gianpiero",
        'last': "Fiorelli",
        'age': 37
    };
    
    res.writeHead(200, {
        'Content-Type': 'application/json',
        'Access-Control-Allow-Origin': '*'
    });
    
    res.end(JSON.stringify(data));
});

server.listen(process.env.PORT, process.env.IP);

console.log('Server running at '  + process.env.PORT + ':' + process.env.IP);

server_jsonp.js

// http://api_test_server.proudlygeek.c9.io/?callback=cb

var http = require("http"),
    url  = require("url");

var server = http.createServer(function(req, res) {
    
    var callback = url.parse(req.url, true).query.callback || "myCallback";
    console.log(url.parse(req.url, true).query.callback);
    
    var data = {
        'name': "Gianpiero",
        'last': "Fiorelli",
        'age': 37
    };
    
    data = callback + '(' + JSON.stringify(data) + ');';
        
    res.writeHead(200, {'Content-Type': 'application/json'});
    res.end(data);
});

server.listen(process.env.PORT, process.env.IP);

console.log('Server running at '  + process.env.PORT + ':' + process.env.IP);

Fix res.writeHead(200, {'Content-Type': 'application/json'}); to res.writeHead(200, {'Content-Type': 'application/javascript''});