public function onResponse(FilterResponseEvent $event)
    {
        $request = $event->getRequest();
        $debug = $request->query->get('debug');
        $response = $event->getResponse();

        //this is for debug purpose
        if ($response instanceof JsonResponse && $debug) {
            $new = new Response();
            $new->setContent('<body>'.$response->getContent().'</body>');
            $event->setResponse($new);
        }
    }