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class MessageController extends Controller
{
    /**
     * @Method({"GET"})
     * @Route("/messages/{messageId}/attachments/{attachmentId}")
     *
     * @param int $messageId
     * @param int $attachmentId
     *
     * @return Response
     *
     * @throws HttpResponseException|NotFoundHttpException
     */
    public function getAttachmentAction($messageId, $attachmentId)
    {
        try {
            // Do something with $messageId, $attachmentId

            $attachment['contentType'] = 'image/png';
            $attachment['name'] = 'test.png';
            $attachment['url'] = 'https://www.inanzzz/files/1';

            $result = $whateverService->fetch($attachment['url']);

            if ($result['responseCode'] != 200) {
                throw new HttpResponseException(sprintf('Couldn\'t fetch file from [%s].', $attachment['url']));
            }

            $response = new Response();
            $response->headers->set('Cache-Control', 'private');
            $response->headers->set('Content-type', $attachment['contentType']);
            $response->headers->set('Content-Disposition', sprintf('attachment;filename=%s', $attachment['name']));
            $response->setStatusCode($result['responseCode']);
            $response->sendHeaders();
            $response->setContent($result['responseContent']);

            return $response;
        } catch (Exception $e) {
            throw new NotFoundHttpException($e->getMessage());
        }
    }
}