web.js

var express = require('express');
var app = express();

var PORT = 3000;

app.use(function(req, res, next) {
  console.log('pid:', process.pid, 'received', req.path);
  next();
});

app.get('/', function(req, res) {
  res.send(200, 'hello world!');
});

app.listen(PORT);