HTTP registry: key

Conveys a representation of the cache key (see, Section 2) used for the response.

Caching values control freshness, reuse, validation, and visibility across browser, proxy, and CDN layers. key is registered in HTTP Cache-Status. Defining reference: rfc9211.

httpregistryhttp-cache-statushttp-cache-status-names

Identifier (http)

key

Conveys a representation of the cache key (see, Section 2) used for the response.

Keep cache keys aligned with response variation, separate private from shared data, and test stale and revalidation behavior across intermediaries.

This registry value is currently marked active by IANA. Follow the defining specification before sending, accepting, or proxying it.

IANA registry: http-cache-status/http-cache-status-names

Registry reference: rfc9211

Sources

HTTP Cache-Status
rfc9211