public function onKernelRequest(GetResponseEvent $event)
    {
        $request = $event->getRequest();

        if (!$request->attributes->get(FOSRestBundle::ZONE_ATTRIBUTE, true)) {
            return;
        }

        try {
            $format = $request->getRequestFormat(null);
            if (null === $format) {
                $accept = $this->formatNegotiator->getBest('');
                if (null !== $accept && 0.0 < $accept->getQuality()) {
                    $format = $request->getFormat($accept->getValue());
                    if (null !== $format) {
                        $request->attributes->set('media_type', $accept->getValue());
                    }
                }
            }

            if (null === $format) {
                if (HttpKernelInterface::MASTER_REQUEST === $event->getRequestType()) {
                    throw new NotAcceptableHttpException('No matching accepted Response format could be determined');
                }

                return;
            }

            $request->setRequestFormat($format);
        } catch (StopFormatListenerException $e) {
            // nothing to do
        }
    }