request timeout handler

request_handler.js

var http = require('http'),
    parse = require('url').parse;

function requestUrl(url, callback) {
  var urlObj = parse(url),
      path = urlObj.pathname + (urlObj.search || ''),
      options = {
        hostname: urlObj.hostname,
        path: path,
        port: urlObj.port || 80,
        method: 'GET'
      },
      req = null,
      response_timeout = setTimeout(function() {
        response_timeout = null;
        req.abort();
        callback("Response timeout");
      }, 5000);

  req = http.request(options, function (res) {
    res.setEncoding('utf-8');
    var chunks = [],
      length = 0;

    res.on('data', function(chunk) {
      chunks.push(chunk);
      length += chunk.length;
    }).on('end', function () {
      var data = new Buffer(length),
          pos = 0,
          l = chunks.length;

      for(var i = 0; i < l; i++) {
        chunks[i].copy(data, pos);
        pos += chunks[i].length;
      }

      res.body = data;
      callback(null, res);
    }).on('error', function(err) {
      callback(err, res);
    });
  }).on('error', function(err) {
    if(response_timeout) {
      clearTimeout(response_timeout);
      callback(err);
    }
  });
  req.end();
}