request.js

var url = require('url');

var PROTOCOLS = {
  'http:': { agent: require('http'), port: 80 },
  'https:': { agent: require('https'), port: 443 }
};

/*
 * @param {String} method HTTP method ('GET', 'POST' ...)
 * @param {String} uri URI (defaults protocol to HTTP)
 * @param {Function} callback function(err, res){}
 */
function request(method, uri, callback) {
  var parsed = url.parse(uri);

  var client = PROTOCOLS[parsed.protocol || 'http:'];
  if (!client)
    throw new Error('invalid protocol ' + parsed.protocol);

  var options = {
    method: method,
    host: parsed.host,
    port: parsed.port || client.port,
    path: parsed.path
  };

  var req = client.agent.request(options, function(res) {
    callback(null, res);
  });

  req.on('error', function(err) {
    callback(err);
  });

  return req;
}