text: require('sticky-cluster')(
  
    // server initialization function
    function (callback) {
      var http = require('http');
      var app = require('express')();
      var server = http.createServer(app);
        
      // configure an app
        // do some async stuff if needed
        
      // don't do server.listen(), just pass the server instance into the callback
      callback(server);
    },
    
    // options
    {
      concurrency: 10,
      port: 3000,
      debug: true,
      env: function (index) { return { stickycluster_worker_index: index }; }
    }
  );
  