public function getResponseHeader($name)
    {
        $headers = $this->driver->getResponseHeaders();

        $name = strtolower($name);
        $headers = array_change_key_case($headers, CASE_LOWER);

        if (!isset($headers[$name])) {
            return null;
        }

        return is_array($headers[$name]) ? $headers[$name][0] : $headers[$name];
    }