field Registered
Verified 2026-09-18 · registry updated
2026-08-28Expires
Gives an absolute date after which a response is considered stale.
Use Cache-Control max-age for modern freshness policy; Expires remains useful for compatibility and must be a valid HTTP date.
httpheadercache
Reference (http)
Expires: Wed, 21 Oct 2015 07:28:00 GMT
Use Cache-Control max-age for modern freshness policy; Expires remains useful for compatibility and must be a valid HTTP date.
Common mistakes
- Assuming Expires overrides a more specific Cache-Control directive.
IANA registry: http-fields/field-names
Registry reference: RFC 9111, Section 5.3: HTTP Caching