111 Revalidation Failed
HTTP Warning status code 111 Revalidation Failed is an unofficial HTTP status code, but instead is used in combination with the Warning HTTP Header and included with HTTP response messages to indicate that the HTTP response is stale and an attempt to validate it has failed because the server can not be reached.
The HTTP status code 111 Revalidation Failed and the Warning HTTP header have been deprecated.
Warning: 111 www.example.ai "Revalidation Failed"
Last updated: June 20, 2022