public function request($url, $method = "GET", $postData = null, $headers = null, $options = null)
    {
        $newRequest = new Request($url, $method);
        if ($postData) {
            $newRequest->setPostData($postData);
        }
        if ($headers) {
            $newRequest->setHeaders($headers);
        }
        if ($options) {
            $newRequest->setOptions($options);
        }

        return $this->add($newRequest);
    }