Socket.io, Express-generator troubleshooting

app.js

var express = require('express'), 
https = require('https');
//...

var app = express();
// ...

module.exports = app;

socket.js

window.onload = function() {
  socket = io.connect('http://127.0.0.1:3333');
  socket.on('connect', function () {
    socket.send('hi');
  });
}

www.js

#!/usr/bin/env node
var debug = require('debug')('app:www');
var app = require('../app');
var server = require('http').createServer(app);
var io = require('../io');
var localHost = 'http://127.0.0.1'
var localPort = '3333';

app.host = app.set('host', process.env.HOST || localHost);
app.port = app.set('port', process.env.PORT || localPort);

var server = app.listen(app.get('port'), function() {
	app.address = app.get('host') + ':' + server.address().port;
	console.log('Express server listening at ' + app.address);
});

io.attach(server);