node_modules/union/examples/socketio/server.js

var fs = require('fs'),
    union = require('union');

var server = union.createServer({
  before: [
    function (req, res) {
      fs.readFile(__dirname + '/index.html',
	  function (err, data) {
		if (err) {
		  res.writeHead(500);
		  return res.end('Error loading index.html');
		}

		res.writeHead(200);
		res.end(data);
	  });
    }
  ]
});

server.listen(9090);

var io = require('socket.io').listen(server);

io.sockets.on('connection', function (socket) {
  socket.emit('news', {hello: 'world'});
  socket.on('my other event', function (data) {
    console.log(data);
  });
});