Cache-Status Parameters

Cache-Status parameters explain how a cache handled a request, including hit status, freshness, stored age, and key selection.

Expose Cache-Status only when its diagnostic detail is safe for the audience. Strip internal hostnames, cache keys, and topology data at trust boundaries.

httpcacheheaderdiagnostics

Reference (http)

Cache-Status: CDN; hit; ttl=300; age=42; fwd=stale

Expose Cache-Status only when its diagnostic detail is safe for the audience. Strip internal hostnames, cache keys, and topology data at trust boundaries.

Common mistakes

Leaking internal cache keys or assuming Cache-Status changes caching semantics; it is diagnostic metadata, not cache policy.

Cache-Control Vary Header Proxies, Gateways, and Forwarded Headers

Sources

MDN HTTP Reference
IANA HTTP Field Name Registry
RFC 9211: The Cache-Status HTTP Response Header Field
IANA HTTP Cache-Status Parameters Registry