Internet Assigned Numbers Authority Hypertext Transfer Protocol (HTTP) Cache Directive Registry Created 2014-02-17 Last Updated 2022-06-08 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registry included below * HTTP Cache Directive Registry HTTP Cache Directive Registry Registration Procedure(s) IETF Review Reference [RFC9111, Section 5.2.4] Available Formats [IMG] CSV Cache Directive Reference immutable [RFC8246] max-age [RFC9111, Section 5.2.1.1, 5.2.2.1] max-stale [RFC9111, Section 5.2.1.2] min-fresh [RFC9111, Section 5.2.1.3] must-revalidate [RFC9111, Section 5.2.2.2] must-understand [RFC9111, Section 5.2.2.3] no-cache [RFC9111, Section 5.2.1.4, 5.2.2.4] no-store [RFC9111, Section 5.2.1.5, 5.2.2.5] no-transform [RFC9111, Section 5.2.1.6, 5.2.2.6] only-if-cached [RFC9111, Section 5.2.1.7] private [RFC9111, Section 5.2.2.7] proxy-revalidate [RFC9111, Section 5.2.2.8] public [RFC9111, Section 5.2.2.9] s-maxage [RFC9111, Section 5.2.2.10] stale-if-error [RFC5861, Section 4] stale-while-revalidate [RFC5861, Section 3] Licensing Terms