Showing content from https://www.iana.org/assignments/http-fields/http-fields.xhtml below:
Hypertext Transfer Protocol (HTTP) Field Name Registry
A-IM permanent [RFC 3229: Delta encoding in HTTP] Accept permanent [RFC9110, Section 12.5.1: HTTP Semantics] Accept-Additions permanent [RFC 2324: Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0)] Accept-CH permanent List [RFC 8942, Section 3.1: HTTP Client Hints] Accept-Charset deprecated [RFC9110, Section 12.5.2: HTTP Semantics] Accept-Datetime permanent [RFC 7089: HTTP Framework for Time-Based Access to Resource States -- Memento] Accept-Encoding permanent [RFC9110, Section 12.5.3: HTTP Semantics] Accept-Features permanent [RFC 2295: Transparent Content Negotiation in HTTP] Accept-Language permanent [RFC9110, Section 12.5.4: HTTP Semantics] Accept-Patch permanent [RFC 5789: PATCH Method for HTTP] Accept-Post permanent [Linked Data Platform 1.0] Accept-Ranges permanent [RFC9110, Section 14.3: HTTP Semantics] Accept-Signature permanent [RFC 9421, Section 5.1: HTTP Message Signatures] Access-Control obsoleted [Access Control for Cross-site Requests] Access-Control-Allow-Credentials permanent [Fetch] Access-Control-Allow-Headers permanent [Fetch] Access-Control-Allow-Methods permanent [Fetch] Access-Control-Allow-Origin permanent [Fetch] Access-Control-Expose-Headers permanent [Fetch] Access-Control-Max-Age permanent [Fetch] Access-Control-Request-Headers permanent [Fetch] Access-Control-Request-Method permanent [Fetch] Activate-Storage-Access provisional Item [https://privacycg.github.io/storage-access-headers] Age permanent [RFC9111, Section 5.1: HTTP Caching] Allow permanent [RFC9110, Section 10.2.1: HTTP Semantics] ALPN permanent [RFC 7639, Section 2: The ALPN HTTP Header Field] Alt-Svc permanent [RFC 7838: HTTP Alternative Services] Alt-Used permanent [RFC 7838: HTTP Alternative Services] Alternates permanent [RFC 2295: Transparent Content Negotiation in HTTP] AMP-Cache-Transform provisional [AMP-Cache-Transform HTTP request header] Apply-To-Redirect-Ref permanent [RFC 4437: Web Distributed Authoring and Versioning (WebDAV) Redirect Reference Resources] Authentication-Control permanent [RFC 8053, Section 4: HTTP Authentication Extensions for Interactive Clients] Authentication-Info permanent [RFC9110, Section 11.6.3: HTTP Semantics] Authorization permanent [RFC9110, Section 11.6.2: HTTP Semantics] Available-Dictionary permanent [RFC-ietf-httpbis-compression-dictionary-19, Section 2.2: Compression Dictionary Transport] C-Ext obsoleted [RFC 2774: An HTTP Extension Framework] [Status change of HTTP experiments to Historic] C-Man obsoleted [RFC 2774: An HTTP Extension Framework] [Status change of HTTP experiments to Historic] C-Opt obsoleted [RFC 2774: An HTTP Extension Framework] [Status change of HTTP experiments to Historic] C-PEP obsoleted [PEP - an Extension Mechanism for HTTP] [Status change of HTTP experiments to Historic] C-PEP-Info deprecated [PEP - an Extension Mechanism for HTTP] [Status change of HTTP experiments to Historic] Cache-Control permanent [RFC9111, Section 5.2] Cache-Status permanent List [RFC9211: The Cache-Status HTTP Response Header Field] Cal-Managed-ID permanent [RFC 8607, Section 5.1: Calendaring Extensions to WebDAV (CalDAV): Managed Attachments] CalDAV-Timezones permanent [RFC 7809, Section 7.1: Calendaring Extensions to WebDAV (CalDAV): Time Zones by Reference] Capsule-Protocol permanent [RFC9297] CDN-Cache-Control permanent Dictionary [RFC9213: Targeted HTTP Cache Control] Cache directives targeted at content delivery networks CDN-Loop permanent [RFC 8586: Loop Detection in Content Delivery Networks (CDNs)] Cert-Not-After permanent [RFC 8739, Section 3.3: Support for Short-Term, Automatically Renewed (STAR) Certificates in the Automated Certificate Management Environment (ACME)] Cert-Not-Before permanent [RFC 8739, Section 3.3: Support for Short-Term, Automatically Renewed (STAR) Certificates in the Automated Certificate Management Environment (ACME)] Clear-Site-Data permanent [Clear Site Data] Client-Cert permanent Item [RFC9440, Section 2: Client-Cert HTTP Header Field] Client-Cert-Chain permanent List [RFC9440, Section 2: Client-Cert HTTP Header Field] Close permanent [RFC9112, Section 9.6: HTTP/1.1] (reserved) CMCD-Object provisional [CTA][CTA-5004 Common Media Client Data] CMCD-Request provisional [CTA][CTA-5004 Common Media Client Data] CMCD-Session provisional [CTA][CTA-5004 Common Media Client Data] CMCD-Status provisional [CTA][CTA-5004 Common Media Client Data] CMSD-Dynamic provisional [CTA][CTA-5006 Common Media Server Data (CMSD)] CMSD-Static provisional [CTA][CTA-5006 Common Media Server Data (CMSD)] Concealed-Auth-Export permanent Item [RFC9729: The Concealed HTTP Authentication Scheme] Configuration-Context provisional [OSLC Configuration Management Version 1.0. Part 3: Configuration Specification] Connection permanent [RFC9110, Section 7.6.1: HTTP Semantics] Content-Base obsoleted [RFC 2068: Hypertext Transfer Protocol -- HTTP/1.1] Obsoleted by [RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1] Content-Digest permanent [RFC 9530, Section 2: Digest Fields] Content-Disposition permanent [RFC 6266: Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)] Content-Encoding permanent [RFC9110, Section 8.4: HTTP Semantics] Content-ID deprecated [The HTTP Distribution and Replication Protocol] Content-Language permanent [RFC9110, Section 8.5: HTTP Semantics] Content-Length permanent [RFC9110, Section 8.6: HTTP Semantics] Content-Location permanent [RFC9110, Section 8.7: HTTP Semantics] Content-MD5 obsoleted [RFC 2616, Section 14.15: Hypertext Transfer Protocol -- HTTP/1.1] Obsoleted by [RFC 7231, Appendix B: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content] Content-Range permanent [RFC9110, Section 14.4: HTTP Semantics] Content-Script-Type obsoleted [HTML 4.01 Specification] Content-Security-Policy permanent [Content Security Policy Level 3] Content-Security-Policy-Report-Only permanent [Content Security Policy Level 3] Content-Style-Type obsoleted [HTML 4.01 Specification] Content-Type permanent [RFC9110, Section 8.3: HTTP Semantics] Content-Version obsoleted [RFC 2068: Hypertext Transfer Protocol -- HTTP/1.1] Cookie permanent [RFC 6265: HTTP State Management Mechanism] Cookie2 obsoleted [RFC 2965: HTTP State Management Mechanism] 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 [Fetch] CTA-Common-Access-Token provisional [CTA][Chris_Lemmons] DASL permanent [RFC 5323: Web Distributed Authoring and Versioning (WebDAV) SEARCH] Date permanent [RFC9110, Section 6.6.1: HTTP Semantics] DAV permanent [RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)] Default-Style obsoleted [HTML 4.01 Specification] Delta-Base permanent [RFC 3229: Delta encoding in HTTP] Deprecation permanent Item [RFC9745, Section 2: The Deprecation HTTP Response Header Field] Depth permanent [RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)] Derived-From obsoleted [RFC 2068: Hypertext Transfer Protocol -- HTTP/1.1] Destination permanent [RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)] Detached-JWS permanent [RFC 9635: Grant Negotiation and Authorization Protocol (GNAP)] Differential-ID deprecated [The HTTP Distribution and Replication Protocol] Dictionary-ID permanent [RFC-ietf-httpbis-compression-dictionary-19, Section 2.3: Compression Dictionary Transport] Digest obsoleted [RFC 3230: Instance Digests in HTTP] Obsoleted by [RFC 9530, Section 1.3: Digest Fields] DPoP permanent [RFC9449: OAuth 2.0 Demonstrating Proof of Possession (DPoP)] DPoP-Nonce permanent [RFC9449: OAuth 2.0 Demonstrating Proof of Possession (DPoP)] Early-Data permanent [RFC 8470: Using Early Data in HTTP] EDIINT-Features provisional [RFC 6017: Electronic Data Interchange - Internet Integration (EDIINT) Features Header Field] ETag permanent [RFC9110, Section 8.8.3: HTTP Semantics] Expect permanent [RFC9110, Section 10.1.1: HTTP Semantics] Expect-CT deprecated [RFC9163: Expect-CT Extension for HTTP] Obsoleted by [IESG] [HTTPBIS] Expires permanent [RFC9111, Section 5.3: HTTP Caching] Ext obsoleted [RFC 2774: An HTTP Extension Framework] [Status change of HTTP experiments to Historic] Forwarded permanent [RFC 7239: Forwarded HTTP Extension] From permanent [RFC9110, Section 10.1.2: HTTP Semantics] GetProfile obsoleted [Implementation of OPS Over HTTP] Hobareg permanent [RFC 7486, Section 6.1.1: HTTP Origin-Bound Authentication (HOBA)] Host permanent [RFC9110, Section 7.2: HTTP Semantics] HTTP2-Settings obsoleted [RFC 7540, Section 3.2.1: Hypertext Transfer Protocol Version 2 (HTTP/2)] Obsolete; see Section 11.1 of [RFC9113] If permanent [RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)] If-Match permanent [RFC9110, Section 13.1.1: HTTP Semantics] If-Modified-Since permanent [RFC9110, Section 13.1.3: HTTP Semantics] If-None-Match permanent [RFC9110, Section 13.1.2: HTTP Semantics] If-Range permanent [RFC9110, Section 13.1.5: HTTP Semantics] If-Schedule-Tag-Match permanent [ RFC 6338: Scheduling Extensions to CalDAV] If-Unmodified-Since permanent [RFC9110, Section 13.1.4: HTTP Semantics] IM permanent [RFC 3229: Delta encoding in HTTP] Include-Referred-Token-Binding-ID permanent [RFC 8473: Token Binding over HTTP] Isolation provisional [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign] Keep-Alive permanent [RFC 2068: Hypertext Transfer Protocol -- HTTP/1.1] Label permanent [RFC 3253: Versioning Extensions to WebDAV: (Web Distributed Authoring and Versioning)] Last-Event-ID permanent [HTML] Last-Modified permanent [RFC9110, Section 8.8.2: HTTP Semantics] Link permanent [RFC 8288: Web Linking] Link-Template permanent [RFC 9652: The Link-Template HTTP Header Field] Location permanent [RFC9110, Section 10.2.2: HTTP Semantics] Lock-Token permanent [RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)] Man obsoleted [RFC 2774: An HTTP Extension Framework] [Status change of HTTP experiments to Historic] Max-Forwards permanent [RFC9110, Section 7.6.2: HTTP Semantics] Memento-Datetime permanent [RFC 7089: HTTP Framework for Time-Based Access to Resource States -- Memento] Meter permanent [RFC 2227: Simple Hit-Metering and Usage-Limiting for HTTP] Method-Check obsoleted [Access Control for Cross-site Requests] Method-Check-Expires obsoleted [Access Control for Cross-site Requests] MIME-Version permanent [RFC9112, Appendix B.1: HTTP/1.1] Negotiate permanent [RFC 2295: Transparent Content Negotiation in HTTP] NEL permanent [Network Error Logging] OData-EntityId permanent [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign] OData-Isolation permanent [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign] OData-MaxVersion permanent [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign] OData-Version permanent [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign] Opt obsoleted [RFC 2774: An HTTP Extension Framework] [Status change of HTTP experiments to Historic] Optional-WWW-Authenticate permanent [RFC 8053, Section 3: HTTP Authentication Extensions for Interactive Clients] Ordering-Type permanent [RFC 3648: Web Distributed Authoring and Versioning (WebDAV) Ordered Collections Protocol] Origin permanent [RFC 6454: The Web Origin Concept] Origin-Agent-Cluster permanent Item [HTML] OSCORE permanent [RFC 8613, Section 11.1: Object Security for Constrained RESTful Environments (OSCORE)] OSLC-Core-Version permanent [OASIS Project Specification 01][OASIS][Chet_Ensign] Overwrite permanent [RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)] P3P obsoleted [The Platform for Privacy Preferences 1.0 (P3P1.0) Specification] PEP obsoleted [PEP - an Extension Mechanism for HTTP] PEP-Info obsoleted [PEP - an Extension Mechanism for HTTP] Permissions-Policy provisional [Permissions Policy] PICS-Label obsoleted [PICS Label Distribution Label Syntax and Communication Protocols] Ping-From permanent [HTML] Ping-To permanent [HTML] Position permanent [RFC 3648: Web Distributed Authoring and Versioning (WebDAV) Ordered Collections Protocol] Pragma deprecated [RFC9111, Section 5.4: HTTP Caching] Prefer permanent [RFC 7240: Prefer Header for HTTP] Preference-Applied permanent [RFC 7240: Prefer Header for HTTP] Priority permanent Dictionary [RFC9218: Extensible Prioritization Scheme for HTTP] ProfileObject obsoleted [Implementation of OPS Over HTTP] Protocol obsoleted [PICS Label Distribution Label Syntax and Communication Protocols] Protocol-Info deprecated [White Paper: Joint Electronic Payment Initiative] Protocol-Query deprecated [White Paper: Joint Electronic Payment Initiative] Protocol-Request obsoleted [PICS Label Distribution Label Syntax and Communication Protocols] Proxy-Authenticate permanent [RFC9110, Section 11.7.1: HTTP Semantics] Proxy-Authentication-Info permanent [RFC9110, Section 11.7.3: HTTP Semantics] Proxy-Authorization permanent [RFC9110, Section 11.7.2: HTTP Semantics] Proxy-Features obsoleted [Notification for Proxy Caches] Proxy-Instruction obsoleted [Notification for Proxy Caches] Proxy-Status permanent List [RFC9209: The Proxy-Status HTTP Response Header Field] Public obsoleted [RFC 2068: Hypertext Transfer Protocol -- HTTP/1.1] Public-Key-Pins permanent [RFC 7469: Public Key Pinning Extension for HTTP] Public-Key-Pins-Report-Only permanent [RFC 7469: Public Key Pinning Extension for HTTP] Range permanent [RFC9110, Section 14.2: HTTP Semantics] Redirect-Ref permanent [RFC 4437: Web Distributed Authoring and Versioning (WebDAV) Redirect Reference Resources] Referer permanent [RFC9110, Section 10.1.3: HTTP Semantics] Referer-Root obsoleted [Access Control for Cross-site Requests] Referrer-Policy permanent [Referrer Policy] The header name does not share the HTTP Referer header's misspelling. Refresh permanent [HTML] Repeatability-Client-ID provisional [Repeatable Requests Version 1.0][OASIS][Chet_Ensign] Repeatability-First-Sent provisional [Repeatable Requests Version 1.0][OASIS][Chet_Ensign] Repeatability-Request-ID provisional [Repeatable Requests Version 1.0][OASIS][Chet_Ensign] Repeatability-Result provisional [Repeatable Requests Version 1.0][OASIS][Chet_Ensign] Replay-Nonce permanent [RFC 8555, Section 6.5.1: Automatic Certificate Management Environment (ACME)] Reporting-Endpoints provisional [Reporting API] Repr-Digest permanent [RFC 9530, Section 3: Digest Fields] Retry-After permanent [RFC9110, Section 10.2.3: HTTP Semantics] Safe obsoleted [RFC 2310: The Safe Response Header Field] [Status change of HTTP experiments to Historic] Schedule-Reply permanent [RFC 6638: Scheduling Extensions to CalDAV] Schedule-Tag permanent [RFC 6338: Scheduling Extensions to CalDAV] 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 [Global Privacy Control (GPC)] Sec-Purpose permanent [Fetch] Intended to replace the (not registered) Purpose and x-moz headers. Sec-Token-Binding permanent [RFC 8473: Token Binding over HTTP] Sec-WebSocket-Accept permanent [RFC 6455: The WebSocket Protocol] Sec-WebSocket-Extensions permanent [RFC 6455: The WebSocket Protocol] Sec-WebSocket-Key permanent [RFC 6455: The WebSocket Protocol] Sec-WebSocket-Protocol permanent [RFC 6455: The WebSocket Protocol] Sec-WebSocket-Version permanent [RFC 6455: The WebSocket Protocol] Security-Scheme obsoleted [RFC 2660: The Secure HyperText Transfer Protocol] [Status change of HTTP experiments to Historic] Server permanent [RFC9110, Section 10.2.4: HTTP Semantics] Server-Timing permanent [Server Timing] Set-Cookie permanent [RFC 6265: HTTP State Management Mechanism] Set-Cookie2 obsoleted [RFC 2965: HTTP State Management Mechanism] Obsoleted by [RFC 6265: HTTP State Management Mechanism] SetProfile obsoleted [Implementation of OPS Over HTTP] Signature permanent [RFC 9421, Section 4.2: HTTP Message Signatures] Signature-Input permanent [RFC 9421, Section 4.1: HTTP Message Signatures] SLUG permanent [RFC 5023: The Atom Publishing Protocol] SoapAction permanent [Simple Object Access Protocol (SOAP) 1.1] Status-URI permanent [RFC 2518: HTTP Extensions for Distributed Authoring -- WEBDAV] Strict-Transport-Security permanent [RFC 6797: HTTP Strict Transport Security (HSTS)] Sunset permanent [RFC 8594: The Sunset HTTP Header Field] Surrogate-Capability provisional [Edge Architecture Specification] Surrogate-Control provisional [Edge Architecture Specification] TCN permanent [RFC 2295: Transparent Content Negotiation in HTTP] TE permanent [RFC9110, Section 10.1.4: HTTP Semantics] Timeout permanent [RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)] Timing-Allow-Origin provisional [Resource Timing Level 1] Topic permanent [RFC 8030, Section 5.4: Generic Event Delivery Using HTTP Push] Traceparent permanent [Trace Context] Tracestate permanent [Trace Context] Trailer permanent [RFC9110, Section 6.6.2: HTTP Semantics] Transfer-Encoding permanent [RFC9112, Section 6.1: HTTP Semantics] TTL permanent [RFC 8030, Section 5.2: Generic Event Delivery Using HTTP Push] Upgrade permanent [RFC9110, Section 7.8: HTTP Semantics] Urgency permanent [RFC 8030, Section 5.3: Generic Event Delivery Using HTTP Push] URI obsoleted [RFC 2068: Hypertext Transfer Protocol -- HTTP/1.1] Use-As-Dictionary permanent [RFC-ietf-httpbis-compression-dictionary-19, Section 2.1: Compression Dictionary Transport] User-Agent permanent [RFC9110, Section 10.1.5: HTTP Semantics] Variant-Vary permanent [RFC 2295: Transparent Content Negotiation in HTTP] Vary permanent [RFC9110, Section 12.5.5: HTTP Semantics] Via permanent [RFC9110, Section 7.6.3: HTTP Semantics] Want-Content-Digest permanent [RFC 9530, Section 4: Digest Fields] Want-Digest obsoleted [RFC 3230: Instance Digests in HTTP] Obsoleted by [RFC 9530, Section 1.3: Digest Fields] Want-Repr-Digest permanent [RFC 9530, Section 4: Digest Fields] Warning obsoleted [RFC9111, Section 5.5: HTTP Caching] WWW-Authenticate permanent [RFC9110, Section 11.6.1: HTTP Semantics] X-Content-Type-Options permanent [Fetch] X-Frame-Options permanent [HTML] * permanent [RFC9110, Section 12.5.5: HTTP Semantics] (reserved)
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