113 Heuristic Expiration
HTTP Warning status code 113 Heuristic Expiration 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 a cache has heuristically chosen a freshness expiration of greater than 24 hours, and that time has expired.
The HTTP status code 113 Heuristic Expiration and the Warning HTTP header have been deprecated.
Warning: 113 www.example.ai "Heuristic Expiration"
Last updated: June 20, 2022