public function toString()
    {
        $status = sprintf('HTTP/%s %d %s', $this->getVersion(), $this->getStatusCode(), $this->getStatusMessage());

        $str  = trim($status) . "\r\n";
        $str .= $this->getHeaders();
        $str .= "\r\n";
        $str .= $this->getContent();
        return $str;
    }