helloslow.js

var http = require('http'), cons = 0;
http.createServer(function(req, res) {
  var mycon = ++cons;
  res.writeHead(200,
    {'Content-Type': 'text/plain'});
  res.write('Hello... ');
  setTimeout(function() {
    res.end('world! #' + mycon + '\n');
  }, 2000);
}).listen(8000);