public function head($url, $parameters = false)
    {
        if (! is_object($url)) {
            $url = new SimpleUrl($url);
        }
        if ($this->getUrl()) {
            $url = $url->makeAbsolute($this->getUrl());
        }
        $response   = $this->user_agent->fetchResponse($url, new SimpleHeadEncoding($parameters));
        $this->page = new SimplePage($response);

        return ! $response->isError();
    }