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https://httpwg.org/specs/rfc9111.html

…ecification text Values to be added to this namespace require IETF Review (see [RFC8126] Section 4.8 ). 5.3. Expires The "Expires" response header field gives the date/time after which the response is considered stale. See Section 4.2 for further discussion of the freshness model…

https://httpwg.org/specs/rfc9112.html

…. Values to be added to this namespace require IETF Review (see Section 4.8 of [RFC8126] ) and MUST conform to the purpose of transfer coding defined in this specification. Use of program names for the identification of encoding formats is not desirable and is discouraged for fut…