app.js

var http = require('http');

http.createServer(function(req, res) {
  if (req.url === '/mysupersecretdeploymentendpoint' && req.method === 'POST') {
    console.log('Post-receive trigger');
    var body = '';
    req.on('data', function(data){
      body += data;
    })
    
    req.on('end', function(){
      res.end();
      
      //Now we can parse the body into json
      //We should try/catch this as it can error
      var githubData = JSON.parse(body);
      
    })
  }

  res.end('Hello, little PaaS (v2)\n');
}).listen(process.env.port || 5000);

console.log('My little PaaS (v2) started on port', process.env.port || 5000);