The following 190 HTTP Header Field values (180 distinct values) were found in all available webconcepts.info specifications. Please be advised that the table shown here is maintained and compiled from Web Concepts sources. The official HTTP Header Field registry is maintained by the Internet Assigned Numbers Authority (IANA).

HTTP Header Field Specification
A-IM RFC 3229: Delta encoding in HTTP
ALPN RFC 7639: The ALPN HTTP Header Field
Accept RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Accept-Additions RFC 2324: Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0)
RFC 7168: The Hyper Text Coffee Pot Control Protocol for Tea Efflux Appliances (HTCPCP-TEA)
Accept-CH Internet Draft ietf-httpbis-client-hints: HTTP Client Hints
Accept-Charset RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Accept-Datetime RFC 7089: HTTP framework for time-based access to resource states - Memento
Accept-Encoding RFC 7694: Hypertext Transfer Protocol (HTTP) Client-Initiated Content-Encoding
RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Accept-Features RFC 2295: Transparent Content Negotiation in HTTP
Accept-Indefinite-Ranges Internet Draft combs-http-indeterminate-range: HTTP/1.1: Range Responses of Indeterminate Length
Accept-Language RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Accept-Patch RFC 5789: PATCH Method for HTTP
Accept-Post W3C TR http://www.w3.org/TR/ldp: Linked Data Platform 1.0 (LDP)
Accept-Push-Policy Internet Draft ruellan-http-accept-push-policy: Accept-Push-Policy Header Field
Accept-Ranges RFC 7233: Hypertext Transfer Protocol (HTTP/1.1): Range Requests
Access-Control-Allow-Credentials W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Access-Control-Allow-Headers W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Access-Control-Allow-Methods W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Access-Control-Allow-Origin W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Access-Control-Expose-Headers W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Access-Control-Max-Age W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Access-Control-Request-Headers W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Access-Control-Request-Method W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Age RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching
Allow RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Alt-Svc RFC 7838: HTTP Alternate Services
Alt-Used RFC 7838: HTTP Alternate Services
Alternates RFC 2295: Transparent Content Negotiation in HTTP
Apply-To-Redirect-Ref RFC 4437: Web Distributed Authoring and Versioning (WebDAV): Redirect Reference Resources
Authentication-Control RFC 8053: HTTP Authentication Extensions for Interactive Clients
Authentication-Info RFC 7615: The Hypertext Transfer Protocol (HTTP) Authentication-Info and Proxy-Authentication-Info Response Header Fields
Authorization RFC 7616: HTTP Digest Access Authentication
RFC 7235: Hypertext Transfer Protocol (HTTP/1.1): Authentication
RFC 5849: The OAuth 1.0 Protocol
C-Ext RFC 2774: An HTTP Extension Framework
C-Man RFC 2774: An HTTP Extension Framework
C-Opt RFC 2774: An HTTP Extension Framework
C-PEP W3C TR http://www.w3.org/TR/WD-http-pep: PEP - An Extension Mechanism for HTTP
C-PEP-Info W3C TR http://www.w3.org/TR/WD-http-pep: PEP - An Extension Mechanism for HTTP
Cache-Control RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching
Cache-NT Internet Draft drechsler-httpbis-improved-caching: Hypertext Transfer Protocol: Improved HTTP Caching
Cal-Managed-ID Internet Draft ietf-calext-caldav-attachments: CalDAV Managed Attachments
Clear-Site-Data W3C TR http://www.w3.org/TR/clear-site-data: Clear Site Data
Close RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Connection RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Content-Base RFC 2068: Hypertext Transfer Protocol - HTTP/1.1
Content-DPR Internet Draft ietf-httpbis-client-hints: HTTP Client Hints
Content-Disposition RFC 6266: Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)
Content-Encoding RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Content-Language RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Content-Length RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Content-Location RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Content-Range Internet Draft combs-http-indeterminate-range: HTTP/1.1: Range Responses of Indeterminate Length
RFC 7233: Hypertext Transfer Protocol (HTTP/1.1): Range Requests
Content-Security-Policy W3C TR http://www.w3.org/TR/CSP2: Content Security Policy Level 2
W3C TR http://www.w3.org/TR/CSP3: Content Security Policy Level 3
Content-Security-Policy-Pin W3C TR http://www.w3.org/TR/csp-pinning: Content Security Policy Pinning
Content-Security-Policy-Report-Only W3C TR http://www.w3.org/TR/CSP2: Content Security Policy Level 2
W3C TR http://www.w3.org/TR/CSP3: Content Security Policy Level 3
Content-Security-Policy-Report-Only-Pin W3C TR http://www.w3.org/TR/csp-pinning: Content Security Policy Pinning
Content-Signature Internet Draft thomson-http-content-signature: Content-Signature Header Field for HTTP
Content-Type RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Content-Version RFC 2068: Hypertext Transfer Protocol - HTTP/1.1
Cookie Internet Draft ietf-httpbis-rfc6265bis: HTTP State Management Mechanism
RFC 6265: HTTP State Management Mechanism
Cookie2 RFC 2965: HTTP State Management Mechanism
DASL RFC 5323: Web Distributed Authoring and Versioning (WebDAV) SEARCH
DAV RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
DNT W3C TR http://www.w3.org/TR/tracking-dnt: Tracking Preference Expression (DNT)
DPR Internet Draft ietf-httpbis-client-hints: HTTP Client Hints
Date RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Delta-Base RFC 3229: Delta encoding in HTTP
Depth RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
Destination RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
Digest RFC 3230: Instance Digests in HTTP
Downlink Internet Draft ietf-httpbis-client-hints: HTTP Client Hints
EDIINT-Features RFC 6017: Electronic Data Interchange - Internet Integration (EDIINT) Features Header Field
EPR W3C TR http://www.w3.org/TR/epr: Entry Point Regulation (EPR)
ETag RFC 7232: Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
Expect RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Expect-CT Internet Draft ietf-httpbis-expect-ct: Expect-CT Extension for HTTP
Expires RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching
Ext RFC 2774: An HTTP Extension Framework
Forwarded RFC 7239: Forwarded HTTP Extension
From RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
HTTP2-Settings RFC 7540: Hypertext Transfer Protocol Version 2
HTTPS W3C TR http://www.w3.org/TR/upgrade-insecure-requests: Upgrade Insecure Requests
Hobareg RFC 7486: HTTP Origin-Bound Authentication (HOBA)
Host RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
IM RFC 3229: Delta encoding in HTTP
If RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
If-Match RFC 7232: Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
If-Modified-Since RFC 7232: Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
If-None-Match RFC 7232: Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
If-Range RFC 7233: Hypertext Transfer Protocol (HTTP/1.1): Range Requests
If-Schedule-Tag-Match RFC 6638: Scheduling Extensions to CalDAV
If-Unmodified-Since RFC 7232: Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
Key Internet Draft ietf-httpbis-key: The Key HTTP Response Header Field
Label RFC 3253: Versioning Extensions to WebDAV (Web Distributed Authoring and Versioning)
Last-Event-ID W3C TR http://www.w3.org/TR/eventsource: Server-Sent Events
Last-Modified RFC 7232: Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
Link RFC 5988: Web Linking
Link-Template Internet Draft nottingham-link-template: The Link-Template HTTP Header Field
Location RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Lock-Token RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
MIME-Version RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Man RFC 2774: An HTTP Extension Framework
Max-Forwards RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Memento-Datetime RFC 7089: HTTP framework for time-based access to resource states - Memento
Negotiate RFC 2295: Transparent Content Negotiation in HTTP
Nice Internet Draft thomson-http-nice: Marking HTTP Requests as Unimportant
Opt RFC 2774: An HTTP Extension Framework
Optional-WWW-Authenticate RFC 8053: HTTP Authentication Extensions for Interactive Clients
Ordering-Type RFC 3648: Web Distributed Authoring and Versioning (WebDAV) Ordered Collections Protocol
Origin W3C TR http://www.w3.org/TR/cors: Cross-Origin Resource Sharing (CORS)
Origin-Cookie Internet Draft west-origin-cookies: Origin Cookies
Overwrite RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
P3P W3C TR http://www.w3.org/TR/P3P: The Platform for Privacy Preferences 1.0 (P3P1.0) Specification
PEP W3C TR http://www.w3.org/TR/WD-http-pep: PEP - An Extension Mechanism for HTTP
PEP-Info W3C TR http://www.w3.org/TR/WD-http-pep: PEP - An Extension Mechanism for HTTP
POE Internet Draft nottingham-http-poe: POST Once Exactly (POE)
POE-Links Internet Draft nottingham-http-poe: POST Once Exactly (POE)
Position RFC 3648: Web Distributed Authoring and Versioning (WebDAV) Ordered Collections Protocol
Pragma RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching
Prefer RFC 7240: Prefer Header for HTTP
Preference-Applied RFC 7240: Prefer Header for HTTP
Proxy-Authenticate RFC 7235: Hypertext Transfer Protocol (HTTP/1.1): Authentication
Proxy-Authentication-Info RFC 7615: The Hypertext Transfer Protocol (HTTP) Authentication-Info and Proxy-Authentication-Info Response Header Fields
Proxy-Authorization RFC 7235: Hypertext Transfer Protocol (HTTP/1.1): Authentication
Proxy-Features W3C TR http://www.w3.org/TR/WD-proxy: Notification for Proxy Caches
Proxy-Instruction W3C TR http://www.w3.org/TR/WD-proxy: Notification for Proxy Caches
Public RFC 2068: Hypertext Transfer Protocol - HTTP/1.1
Public-Key-Pins RFC 7469: Public Key Pinning Extension for HTTP
Public-Key-Pins-Report-Only RFC 7469: Public Key Pinning Extension for HTTP
Push-Policy Internet Draft ruellan-http-accept-push-policy: Accept-Push-Policy Header Field
Range RFC 7233: Hypertext Transfer Protocol (HTTP/1.1): Range Requests
Redirect-Ref RFC 4437: Web Distributed Authoring and Versioning (WebDAV): Redirect Reference Resources
Referer RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Report-To W3C TR http://www.w3.org/TR/reporting-1: Reporting API 1
Retry-After RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
SOAPAction W3C TR http://www.w3.org/TR/SOAP: Simple Object Access Protocol (SOAP) 1.1
Safe RFC 2310: The Safe Response Header Field
Save-Data Internet Draft ietf-httpbis-client-hints: HTTP Client Hints
Schedule-Reply RFC 6638: Scheduling Extensions to CalDAV
Schedule-Tag RFC 6638: Scheduling Extensions to CalDAV
Sec-COWL W3C TR http://www.w3.org/TR/COWL: Confinement with Origin Web Labels
Sec-WebSocket-Accept RFC 6455: The WebSocket Protocol
Sec-WebSocket-Extensions RFC 6455: The WebSocket Protocol
Sec-WebSocket-Key RFC 6455: The WebSocket Protocol
Sec-WebSocket-Protocol RFC 6455: The WebSocket Protocol
Sec-WebSocket-Version RFC 6455: The WebSocket Protocol
Security-Scheme RFC 2660: The Secure HyperText Transfer Protocol (S-HTTP)
Server RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Service-Worker W3C TR http://www.w3.org/TR/service-workers-1: Service Workers 1
Service-Worker-Allowed W3C TR http://www.w3.org/TR/service-workers-1: Service Workers 1
Set-Cookie Internet Draft ietf-httpbis-rfc6265bis: HTTP State Management Mechanism
RFC 6265: HTTP State Management Mechanism
Set-Cookie2 RFC 2965: HTTP State Management Mechanism
Signature Internet Draft cavage-http-signatures: Signing HTTP Messages
Slug RFC 5023: Atom Publishing Protocol (AtomPub)
Status-URI RFC 2518: HTTP Extensions for Distributed Authoring - WEBDAV
Strict-Transport-Security RFC 6797: HTTP Strict Transport Security (HSTS)
SubOK Internet Draft mogul-http-dupsup: Duplicate Suppression in HTTP
Subst Internet Draft mogul-http-dupsup: Duplicate Suppression in HTTP
Sunset Internet Draft wilde-sunset-header: The Sunset HTTP Header
Surrogate-Capability W3C TR http://www.w3.org/TR/edge-arch: Edge Architecture Specification
Surrogate-Control W3C TR http://www.w3.org/TR/edge-arch: Edge Architecture Specification
TCN RFC 2295: Transparent Content Negotiation in HTTP
TE RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Timeout RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
Title RFC 4229: HTTP Header Field Registrations
Tk W3C TR http://www.w3.org/TR/tracking-dnt: Tracking Preference Expression (DNT)
Trailer RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Transfer-Encoding RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Tunnel-Protocol Internet Draft ietf-httpbis-tunnel-protocol: The Tunnel-Protocol HTTP Header Field
URI RFC 2068: Hypertext Transfer Protocol - HTTP/1.1
Upgrade RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
User-Agent RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Variant-Vary RFC 2295: Transparent Content Negotiation in HTTP
Vary RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Via RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Viewport-Width Internet Draft ietf-httpbis-client-hints: HTTP Client Hints
WWW-Authenticate RFC 7616: HTTP Digest Access Authentication
RFC 7235: Hypertext Transfer Protocol (HTTP/1.1): Authentication
Want-Digest RFC 3230: Instance Digests in HTTP
Warning RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching
Width Internet Draft ietf-httpbis-client-hints: HTTP Client Hints
X-Frame-Options RFC 7034: HTTP Header Field X-Frame-Options



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