Node.js Hello World Web Server

app.js

var http = require('http');

var server = http.createServer(function(req, res) {
	res.writeHead(200, {
		'Content-type': 'text/plain'
	});
	res.end('Hello World');
});

server.listen(8000, "127.0.0.1");

console.log('Listening on http://127.0.0.1:8000');