code: function (services, callback) {
            var http = require('http');
            var app = require('express')();
            var server = http.createServer(app);
  
            // get remote services
            //var fakedb1 = services[0];
            //var fakedb2 = services[1];
  
            // all express-related stuff goes here, e.g.
            app.use(function (req, res) { res.end('Handled by PID = ' + process.pid); });
  
            // all socket.io stuff goes here
            //var io = require('socket.io')(server);
  
            // don't do server.listen(...)!
            // just pass the server instance to the final async's callback
            callback(null, server);
          }
docs: configure the worker