| ERROR | Revalidation Failed |
| CAUSE | User agents attempt to revalidate a stale response failed. HTTP_CACHE_ERROR = 11 |
| ACTION | The user agent client takes proper actions |
| ERROR | Revalidation Failed |
| CAUSE | User agents attempt to revalidate a stale response failed. HTTP_CACHE_ERROR = 11 |
| ACTION | The user agent client takes proper actions |