code: public function kernelRequest(GetResponseEvent $event)
      {
          $request = $event->getRequest();
          $content = $request->getContent();
  
          if ('' === $content) {
              return;
          }
  
          try {
              $filters = json_decode($content, true);
          } catch (Exception $exception) {
              throw new BadRequestHttpException('Request body should be an object.', $exception);
          }
  
          if (!is_array($filters)) {
              throw new BadRequestHttpException('Request body should be an object.');
          }
  
          $current = $request->attributes->get('_api_filters', []);
          $query = $request->query->all();
          $filters = array_merge($current, $query, $filters);
          $request->attributes->set('_api_filters', $filters);
      }
docs: Transfer get request content to api filters in order to allow large api filters
  
  @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event