throwNotFoundHttpException example

  public function getRevision(EntityInterface $entity, $resource_version_identifier) {
    try {
      [$version_negotiator_name, $version_argument] = explode(VersionNegotiator::SEPARATOR, $resource_version_identifier, 2);
      if (!isset($this->negotiators[$version_negotiator_name])) {
        static::throwBadRequestHttpException($resource_version_identifier);
      }
      return $this->negotiators[$version_negotiator_name]->getRevision($entity, $version_argument);
    }
    catch (VersionNotFoundException $exception) {
      static::throwNotFoundHttpException($entity, $resource_version_identifier);
    }
    catch (InvalidVersionIdentifierException $exception) {
      static::throwBadRequestHttpException($resource_version_identifier);
    }
  }

  /** * Throws a cacheable error exception. * * @param \Drupal\Core\Entity\EntityInterface $entity * The entity for which a revision was requested. * @param string $resource_version_identifier * The user input for the revision negotiation. * * @throws \Drupal\Core\Http\Exception\CacheableNotFoundHttpException */