public function show(string $url, bool $rawMessage = false)
    {
        Assert::notEmpty($url);

        $headers = [];
        if ($rawMessage) {
            $headers['Accept'] = 'message/rfc2822';
        }

        $response = $this->httpGet($url, [], $headers);

        return $this->hydrateResponse($response, ShowResponse::class);
    }