eZ\Bundle\EzPublishRestBundle\EventListener\RequestListener::onKernelRequest PHP Method

    public function onKernelRequest(GetResponseEvent $event)
    {
        $isRestRequest = true;
        if (!$this->hasRestPrefix($event->getRequest())) {
            $isRestRequest = false;
        }
        $event->getRequest()->attributes->set('is_rest_request', $isRestRequest);
    }