server.js

(function() {
  var http = require('http'),
    express = require('express'),
    app = express(),
    port = process.env.PORT || 80,
    ip = process.env.IP || '0.0.0.0';

  // Simple logger.
  app.use(function(req, res, next) {
    console.log('%s %s', req.method, req.url);
    next();
  });

  // Set generic headers used in all responses.
  app.use(function(req, res, next) {
    res.set({
      'X-Powered-By': 'NodeJS',
      'Access-Control-Allow-Methods': 'GET, POST',               // Allowed request http verbs.
      'Access-Control-Allow-Headers': 'X-Requested-With,content-type'    // Allowed request headers.
    });
    next();
  });

  // Handle all static file GET requests.
  app.use(express.static(__dirname + '/build'));

  http.createServer(
    app.handle.bind(app)
  ).listen(port, ip, function() {
    console.log('Listening on http://' + ip + ':' + port);
  });
} ());