node.js, simple routing process

node_basic_http_rout.js

var server, ip = "127.0.0.1",
    port = 1337,
    http = require('http'),
    url = require('url');
server = http.createServer(function (req, res) {
  console.log(req.url);
  res.writeHead(200, {
    'Content-Type': 'text/plain'
  });
  res.end('hello world\n');
});
server.listen(port, ip);
console.log("Server running at http://" + ip + ":" + port);