node.jsの写経。 http://dl.dropbox.com/u/219436/node.js/handson/build/html/intro/async_io.html

download1.js

var util = require('util');
var url = require('url');
var http = require('http');

function download(u) {
  u = url.parse(u)
  var client = http.createClient(u.port || 80, u.hostname);
  var req = client.request('GET', u.pathname, {host: u.hostname});
  req.end();
  req.on('response', function(res) {
    console.log(res.statusCode);
    for (var key in res.headers) {
      console.log(key + ': ' + res.headers[key]);
    }
    console.log();
    res.setEncoding('UTF-8');
    res.on('data', function(chunk) {
      util.print(chunk);
    });
    res.on('end', function() {
      console.log();
    });
  });
}

download("http://www.google.co.jp/")