Node parallel async requests

parallel.js

var parallels = [];

for (var i = 0; i < 10; i++) {
  (function (i) {
    var deferred = q.defer(),
        userId = userIdList[i];
    
    request.post(urlOptions, function (err, response, body) {
      if (err) return deferred.reject(err);
      if (result.statusCode > 399) {
          err = new Error([result.statusCode, data].join(' '));
          return deferred.reject(err);
      }

      deferred.resolve(data);
    });
    
    parallels.push(deferred.promise);
  })(i);
}

q.all(parallels)
  .then(function (results) {
    res.send({
      success: true
    });
  })
  .catch(res.extjs.error.server);