public function post($url, $parameters = false, $content_type = false)
    {
        if (! is_object($url)) {
            $url = new SimpleUrl($url);
        }
        if ($this->getUrl()) {
            $url = $url->makeAbsolute($this->getUrl());
        }

        return $this->load($url, new SimplePostEncoding($parameters, $content_type));
    }