field_name status structured_type rfc references comments * permanent 9110 RFC 9110, Section 12.5.5 (reserved) A-IM permanent 3229 RFC 3229 ALPN permanent 7639 RFC 7639, Section 2 AMP-Cache-Transform provisional Accept permanent 9110 RFC 9110, Section 12.5.1 Accept-Additions permanent 2324 RFC 2324 Accept-CH permanent List 8942 RFC 8942, Section 3.1 Accept-Charset deprecated 9110 RFC 9110, Section 12.5.2 Accept-Datetime permanent 7089 RFC 7089 Accept-Encoding permanent 9110 RFC 9110, Section 12.5.3 Accept-Features permanent 2295 RFC 2295 Accept-Language permanent 9110 RFC 9110, Section 12.5.4 Accept-Patch permanent 5789 RFC 5789 Accept-Post permanent Accept-Query permanent List 10008 RFC 10008, Section 3 Accept-Ranges permanent 9110 RFC 9110, Section 14.3 Accept-Signature permanent 9421 RFC 9421, Section 5.1 Access-Control obsoleted Access-Control-Allow-Credentials permanent Access-Control-Allow-Headers permanent Access-Control-Allow-Methods permanent Access-Control-Allow-Origin permanent Access-Control-Expose-Headers permanent Access-Control-Max-Age permanent Access-Control-Request-Headers permanent Access-Control-Request-Method permanent Activate-Storage-Access provisional Item https://privacycg.github.io/storage-access-headers Age permanent 9111 RFC 9111, Section 5.1 Allow permanent 9110 RFC 9110, Section 10.2.1 Alt-Svc permanent 7838 RFC 7838 Alt-Used permanent 7838 RFC 7838 Alternates permanent 2295 RFC 2295 Apply-To-Redirect-Ref permanent 4437 RFC 4437 Authentication-Control permanent 8053 RFC 8053, Section 4 Authentication-Info permanent 9110 RFC 9110, Section 11.6.3 Authorization permanent 9110 RFC 9110, Section 11.6.2 Available-Dictionary permanent Item 9842 RFC 9842, Section 2.2 C-Ext obsoleted 2774 RFC 2774 [Status change of HTTP experiments to Historic] C-Man obsoleted 2774 RFC 2774 [Status change of HTTP experiments to Historic] C-Opt obsoleted 2774 RFC 2774 [Status change of HTTP experiments to Historic] C-PEP obsoleted [Status change of HTTP experiments to Historic] C-PEP-Info deprecated [Status change of HTTP experiments to Historic] CDN-Cache-Control permanent Dictionary 9213 RFC 9213 Cache directives targeted at content delivery networks CDN-Loop permanent 8586 RFC 8586 CMCD-Object provisional CTA CMCD-Request provisional CTA CMCD-Session provisional CTA CMCD-Status provisional CTA CMSD-Dynamic provisional CTA CMSD-Static provisional CTA CTA-Common-Access-Token provisional CTA Cache-Control permanent 9111 RFC 9111, Section 5.2 Cache-Group-Invalidation permanent List 9875 RFC 9875 Cache-Groups permanent List 9875 RFC 9875 Cache-Status permanent List 9211 RFC 9211 Cal-Managed-ID permanent 8607 RFC 8607, Section 5.1 CalDAV-Timezones permanent 7809 RFC 7809, Section 7.1 Capsule-Protocol permanent Item 9297 RFC 9297 Cert-Not-After permanent 8739 RFC 8739, Section 3.3 Cert-Not-Before permanent 8739 RFC 8739, Section 3.3 Clear-Site-Data permanent Client-Cert permanent Item 9440 RFC 9440, Section 2 Client-Cert-Chain permanent List 9440 RFC 9440, Section 2 Close permanent 9112 RFC 9112, Section 9.6 (reserved) Concealed-Auth-Export permanent Item 9729 RFC 9729 Configuration-Context provisional Connect-UDP-Bind permanent Item Connection permanent 9110 RFC 9110, Section 7.6.1 Content-Base obsoleted 2068 RFC 2068 Obsoleted by [RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1] Content-Digest permanent Dictionary 9530 RFC 9530, Section 2 Content-Disposition permanent 6266 RFC 6266 Content-Encoding permanent 9110 RFC 9110, Section 8.4 Content-ID deprecated Content-Language permanent 9110 RFC 9110, Section 8.5 Content-Length permanent 9110 RFC 9110, Section 8.6 Content-Location permanent 9110 RFC 9110, Section 8.7 Content-MD5 obsoleted 2616 RFC 2616, Section 14.15 Obsoleted by [RFC 7231, Appendix B: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content] Content-Range permanent 9110 RFC 9110, Section 14.4 Content-Script-Type obsoleted HTML 4.01 Specification Content-Security-Policy permanent Content-Security-Policy-Report-Only permanent Content-Style-Type obsoleted HTML 4.01 Specification Content-Type permanent 9110 RFC 9110, Section 8.3 Content-Version obsoleted 2068 RFC 2068 Cookie permanent 6265 Cookie2 obsoleted 2965 RFC 2965 Obsoleted by [RFC 6265: HTTP State Management Mechanism] Cross-Origin-Embedder-Policy permanent Item HTML Cross-Origin-Embedder-Policy-Report-Only permanent Item HTML Cross-Origin-Opener-Policy permanent Item HTML Cross-Origin-Opener-Policy-Report-Only permanent Item HTML Cross-Origin-Resource-Policy permanent DASL permanent 5323 RFC 5323 DAV permanent 4918 RFC 4918 DPoP permanent 9449 RFC 9449 DPoP-Nonce permanent 9449 RFC 9449 Date permanent 9110 RFC 9110, Section 6.6.1 Default-Style obsoleted HTML 4.01 Specification Delta-Base permanent 3229 RFC 3229 Deprecation permanent Item 9745 RFC 9745, Section 2 Depth permanent 4918 RFC 4918 Derived-From obsoleted 2068 RFC 2068 Destination permanent 4918 RFC 4918 Detached-JWS permanent 9635 RFC 9635 Dictionary-ID permanent Item 9842 RFC 9842, Section 2.3 Differential-ID deprecated Digest obsoleted 3230 RFC 3230 Obsoleted by [RFC 9530, Section 1.3: Digest Fields] EDIINT-Features provisional 6017 RFC 6017 ETag permanent 9110 RFC 9110, Section 8.8.3 Early-Data permanent 8470 RFC 8470 Expect permanent 9110 RFC 9110, Section 10.1.1 Expect-CT deprecated 9163 RFC 9163 Obsoleted by [IESG]; [HTTPBIS] Expires permanent 9111 RFC 9111, Section 5.3 Ext obsoleted 2774 RFC 2774 [Status change of HTTP experiments to Historic] Forwarded permanent 7239 RFC 7239 From permanent 9110 RFC 9110, Section 10.1.2 GetProfile obsoleted HTTP2-Settings obsoleted 7540 RFC 7540, Section 3.2.1 Obsolete; see [Section 11.1 of RFC 9113] Hobareg permanent 7486 RFC 7486, Section 6.1.1 Host permanent 9110 RFC 9110, Section 7.2 IM permanent 3229 RFC 3229 If permanent 4918 RFC 4918 If-Match permanent 9110 RFC 9110, Section 13.1.1 If-Modified-Since permanent 9110 RFC 9110, Section 13.1.3 If-None-Match permanent 9110 RFC 9110, Section 13.1.2 If-Range permanent 9110 RFC 9110, Section 13.1.5 If-Schedule-Tag-Match permanent 6338 RFC 6338 If-Unmodified-Since permanent 9110 RFC 9110, Section 13.1.4 Include-Referred-Token-Binding-ID permanent 8473 RFC 8473 Incremental permanent Item 10036 RFC 10036 Isolation provisional OASIS Keep-Alive permanent 2068 RFC 2068 Label permanent 3253 RFC 3253 Last-Event-ID permanent HTML Last-Modified permanent 9110 RFC 9110, Section 8.8.2 Link permanent 8288 RFC 8288 Link-Template permanent 9652 RFC 9652 Location permanent 9110 RFC 9110, Section 10.2.2 Lock-Token permanent 4918 RFC 4918 MIME-Version permanent 9112 RFC 9112, Appendix B.1 Man obsoleted 2774 RFC 2774 [Status change of HTTP experiments to Historic] Max-Forwards permanent 9110 RFC 9110, Section 7.6.2 Memento-Datetime permanent 7089 RFC 7089 Meter permanent 2227 RFC 2227 Method-Check obsoleted Method-Check-Expires obsoleted NEL permanent Negotiate permanent 2295 RFC 2295 No-Vary-Search permanent Dictionary OData-EntityId permanent OASIS OData-Isolation permanent OASIS OData-MaxVersion permanent OASIS OData-Version permanent OASIS OSCORE permanent 8613 RFC 8613, Section 11.1 OSLC-Core-Version permanent OASIS Project Specification 01; OASIS Opt obsoleted 2774 RFC 2774 [Status change of HTTP experiments to Historic] Optional-WWW-Authenticate permanent 8053 RFC 8053, Section 3 Ordering-Type permanent 3648 RFC 3648 Origin permanent 6454 RFC 6454 Origin-Agent-Cluster permanent Item HTML Overwrite permanent 4918 RFC 4918 P3P obsoleted PEP obsoleted PEP-Info obsoleted PICS-Label obsoleted Permissions-Policy provisional Ping-From permanent HTML Ping-To permanent HTML Position permanent 3648 RFC 3648 Pragma deprecated 9111 RFC 9111, Section 5.4 Prefer permanent 7240 RFC 7240 Preference-Applied permanent 7240 RFC 7240 Priority permanent Dictionary 9218 RFC 9218 ProfileObject obsoleted Protocol obsoleted Protocol-Info deprecated Protocol-Query deprecated Protocol-Request obsoleted Proxy-Authenticate permanent 9110 RFC 9110, Section 11.7.1 Proxy-Authentication-Info permanent 9110 RFC 9110, Section 11.7.3 Proxy-Authorization permanent 9110 RFC 9110, Section 11.7.2 Proxy-Features obsoleted Proxy-Instruction obsoleted Proxy-Public-Address permanent List Proxy-Status permanent List 9209 RFC 9209 Public obsoleted 2068 RFC 2068 Public-Key-Pins permanent 7469 RFC 7469 Public-Key-Pins-Report-Only permanent 7469 RFC 7469 Range permanent 9110 RFC 9110, Section 14.2 Redirect-Ref permanent 4437 RFC 4437 Referer permanent 9110 RFC 9110, Section 10.1.3 Referer-Root obsoleted Referrer-Policy permanent The header name does not share the HTTP Referer header's misspelling. Refresh permanent HTML Repeatability-Client-ID provisional OASIS Repeatability-First-Sent provisional OASIS Repeatability-Request-ID provisional OASIS Repeatability-Result provisional OASIS Replay-Nonce permanent 8555 RFC 8555, Section 6.5.1 Reporting-Endpoints provisional Repr-Digest permanent Dictionary 9530 RFC 9530, Section 3 Retry-After permanent 9110 RFC 9110, Section 10.2.3 SLUG permanent 5023 RFC 5023 Safe obsoleted 2310 RFC 2310 [Status change of HTTP experiments to Historic] Schedule-Reply permanent 6638 RFC 6638 Schedule-Tag permanent 6338 RFC 6338 Sec-Fetch-Dest permanent Item https://www.w3.org/TR/fetch-metadata/#sec-fetch-dest-header Sec-Fetch-Mode permanent Item https://www.w3.org/TR/fetch-metadata/#sec-fetch-mode-header Sec-Fetch-Site permanent Item https://www.w3.org/TR/fetch-metadata/#sec-fetch-site-header Sec-Fetch-Storage-Access provisional Token https://privacycg.github.io/storage-access-headers Sec-Fetch-User permanent Item https://www.w3.org/TR/fetch-metadata/#sec-fetch-user-header Sec-GPC provisional Sec-Purpose permanent Intended to replace the (not registered) Purpose and x-moz headers. Sec-Token-Binding permanent 8473 RFC 8473 Sec-WebSocket-Accept permanent 6455 RFC 6455 Sec-WebSocket-Extensions permanent 6455 RFC 6455 Sec-WebSocket-Key permanent 6455 RFC 6455 Sec-WebSocket-Protocol permanent 6455 RFC 6455 Sec-WebSocket-Version permanent 6455 RFC 6455 Security-Scheme obsoleted 2660 RFC 2660 [Status change of HTTP experiments to Historic] Server permanent 9110 RFC 9110, Section 10.2.4 Server-Timing permanent Set-Cookie permanent 6265 Set-Cookie2 obsoleted 2965 RFC 2965 Obsoleted by [RFC 6265: HTTP State Management Mechanism] Set-Txn permanent 9967 RFC 9967, Section 3 SetProfile obsoleted Signature permanent Dictionary 9421 RFC 9421, Section 4.2 Signature-Input permanent Dictionary 9421 RFC 9421, Section 4.1 SoapAction permanent Status-URI permanent 2518 RFC 2518 Strict-Transport-Security permanent 6797 RFC 6797 Sunset permanent 8594 RFC 8594 Surrogate-Capability provisional Surrogate-Control provisional TCN permanent 2295 RFC 2295 TE permanent 9110 RFC 9110, Section 10.1.4 TTL permanent 8030 RFC 8030, Section 5.2 Timeout permanent 4918 RFC 4918 Timing-Allow-Origin provisional Topic permanent 8030 RFC 8030, Section 5.4 Traceparent permanent Tracestate permanent Trailer permanent 9110 RFC 9110, Section 6.6.2 Transfer-Encoding permanent 9112 RFC 9112, Section 6.1 URI obsoleted 2068 RFC 2068 Unencoded-Digest permanent Dictionary Upgrade permanent 9110 RFC 9110, Section 7.8 Urgency permanent 8030 RFC 8030, Section 5.3 Use-As-Dictionary permanent Dictionary 9842 RFC 9842, Section 2.1 User-Agent permanent 9110 RFC 9110, Section 10.1.5 Variant-Vary permanent 2295 RFC 2295 Vary permanent 9110 RFC 9110, Section 12.5.5 Via permanent 9110 RFC 9110, Section 7.6.3 WWW-Authenticate permanent 9110 RFC 9110, Section 11.6.1 Want-Content-Digest permanent Dictionary 9530 RFC 9530, Section 4 Want-Digest obsoleted 3230 RFC 3230 Obsoleted by [RFC 9530, Section 1.3: Digest Fields] Want-Repr-Digest permanent Dictionary 9530 RFC 9530, Section 4 Want-Unencoded-Digest permanent Dictionary Warning obsoleted 9111 RFC 9111, Section 5.5 X-Content-Type-Options permanent X-Frame-Options permanent HTML