HTTP registry: must-revalidate

Registered value from the IANA HTTP registry.

Caching values control freshness, reuse, validation, and visibility across browser, proxy, and CDN layers. must-revalidate is registered in HTTP Cache Directive Registry. Defining reference: RFC9111, Section 5.2.2.2.

httpregistryhttp-cache-directivescache-directives

Identifier (http)

must-revalidate

Registered value from the IANA HTTP registry.

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-directives/cache-directives

Registry reference: RFC9111, Section 5.2.2.2

Sources

HTTP Cache Directive Registry
RFC9111, Section 5.2.2.2