CacheableUnauthorizedHttpException example

    // other response)     // 2. Have the 'config:user.role.anonymous' cache tag, because the only     // reason this 401 would no longer be a 401 is if permissions for the     // 'anonymous' role change, causing the cache tag to be invalidated.     // @see \Drupal\Core\EventSubscriber\AuthenticationSubscriber::onExceptionSendChallenge()     // @see \Drupal\Core\EventSubscriber\ClientErrorResponseSubscriber()     // @see \Drupal\Core\EventSubscriber\FinishResponseSubscriber::onAllResponds()     $cacheability = CacheableMetadata::createFromObject($site_config)
      ->addCacheTags(['config:user.role.anonymous'])
      ->addCacheContexts(['user.roles:anonymous']);
    return $request->isMethodCacheable()
      ? new CacheableUnauthorizedHttpException($cacheability, (string) $challenge, 'No authentication credentials provided.', $previous)
      : new UnauthorizedHttpException((string) $challenge, 'No authentication credentials provided.', $previous);
  }

}