111 Revalidation Failed

When a cache cannot reach the origin server to revalidate a stale response, the 111 Revalidation Failed warning code is attached to the Warning header. The code indicates the response is stale and the revalidation attempt did not succeed.

Example

Warning: 111 www.example.re "Revalidation Failed"

See also

• RFC 7234: HTTP Caching (obsoleted)
• RFC 9111: HTTP Caching
• Warning
• Cache-Status
• Caching
• HTTP status codes