public function request($method, $uri, $params = array(), $data = array(),
                            $headers = array(), $user = null, $password=null,
                            $timeout=null) {
        $url = $this->absoluteUrl($uri);
        return $this->client->request(
            $method,
            $url,
            $params,
            $data,
            $headers,
            $user,
            $password,
            $timeout
        );
    }