text: //main.js
  
  var express = require('express');
  var app = express();
  
  // reply to request with "Hello World"
  app.get('/', function (req, res) {
    res.send("Hello World release 7.");
  });
  
  //start a server on port 80 and log its start to our console
  var server = app.listen(80, function () {
    var port = server.address().port;
    console.log("Node.js server running in a container and listening on port: ", port);
  });