RFC 9211: The Cache-Status HTTP Response Header Field

To aid debugging, HTTP caches often append header fields to a response, explaining how they handled the request in an ad hoc manner. This specification…

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Outgoing relationships (4 related RFCs)

Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 8174: Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words
Normative reference — RFC 8126: Guidelines for Writing an IANA Considerations Section in RFCs
Normative reference — RFC 8941: Structured Field Values for HTTP