The following 236 HTTP Header Field values (226 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-Additions2 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-Encoding2 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-Profile Internet Draft svensson-profiled-representations: Indicating, Discovering, Negotiating, and Writing Profiled Representations
Accept-Push-Policy Internet Draft ruellan-http-accept-push-policy: Accept-Push-Policy Header Field
Accept-Query Internet Draft ietf-httpbis-safe-method-w-body: The HTTP QUERY Method
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
Authorization3 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
CDN-Cache-Control RFC 9213: Targeted HTTP Cache Control
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
Cache-Status Internet Draft ietf-httpbis-cache-header: The Cache-Status HTTP Response Header Field
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
Client-Cert Internet Draft ietf-httpbis-client-cert-field: Client-Cert HTTP Header Field
Client-Cert-Chain Internet Draft ietf-httpbis-client-cert-field: Client-Cert HTTP Header Field
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-Digest RFC 9530: Digest Fields
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-Range2 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-Policy2 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-Only2 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-Translation-Type RFC 8255: Multiple Language Content Type
Content-Type RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Content-Version RFC 2068: Hypertext Transfer Protocol - HTTP/1.1
Content-Warning Internet Draft cedik-http-warning: Communicating Warning Information in HTTP APIs
Cookie2 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)
Date RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Delta-Base RFC 3229: Delta encoding in HTTP
Deprecation Internet Draft ietf-httpapi-deprecation-header: The Deprecation HTTP Header
Depth RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
Destination RFC 4918: HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)
Device-Memory W3C TR http://www.w3.org/TR/device-memory-1: Device Memory
Digest RFC 3230: Instance Digests in HTTP
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
Early-Data RFC 8470: Using Early Data in HTTP
Expect RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Expect-CT RFC 9163: Expect-CT Extension for HTTP
Expires RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching
Ext RFC 2774: An HTTP Extension Framework
Feature-Policy W3C TR http://www.w3.org/TR/feature-policy-1: Feature Policy
Forwarded RFC 7239: Forwarded HTTP Extension
From RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
GET-Location Internet Draft reschke-http-get-location: The Hypertext Transfer Protocol (HTTP) GET-Location header
HTTP2-Settings RFC 7540: Hypertext Transfer Protocol Version 2
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
Idempotency-Key Internet Draft ietf-httpapi-idempotency-key-header: The Idempotency-Key HTTP Header Field
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
Include-Referred-Token-Binding-ID RFC 8473: Token Binding over HTTP
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 8288: Web Linking
Link-Template Internet Draft ietf-httpapi-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
NEL W3C TR http://www.w3.org/TR/network-error-logging-1: Network Error Logging
Negotiate RFC 2295: Transparent Content Negotiation in HTTP
Nice Internet Draft thomson-http-nice: Marking HTTP Requests as Unimportant
OData-EntityId OASIS Standard odata-v4.0-part1-protocol: OData Version 4.0 Part 1: Protocol
OData-Isolation OASIS Standard odata-v4.0-part1-protocol: OData Version 4.0 Part 1: Protocol
OData-MaxVersion OASIS Standard odata-v4.0-part1-protocol: OData Version 4.0 Part 1: Protocol
OSCORE RFC 8613: Object Security for Constrained RESTful Environments (OSCORE)
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
Prefer-Push Internet Draft pot-prefer-push: HTTP-client suggested Push Preference
Preference-Applied RFC 7240: Prefer Header for HTTP
Priority Internet Draft ietf-httpbis-priority: Extensible Prioritization Scheme 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
Proxy-Status RFC 9209: The Proxy-Status HTTP Response Header Field
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
RateLimit-Limit Internet Draft ietf-httpapi-ratelimit-headers: Rate-Limit Header Fields for HTTP
RateLimit-Remaining Internet Draft ietf-httpapi-ratelimit-headers: Rate-Limit Header Fields for HTTP
RateLimit-Reset Internet Draft ietf-httpapi-ratelimit-headers: Rate-Limit Header Fields for HTTP
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
Repeatability-Client-ID OASIS Standard repeatable-requests-v1.0: Repeatable Requests Version 1.0
Repeatability-First-Sent OASIS Standard repeatable-requests-v1.0: Repeatable Requests Version 1.0
Repeatability-Request-ID OASIS Standard repeatable-requests-v1.0: Repeatable Requests Version 1.0
Repeatability-Result OASIS Standard repeatable-requests-v1.0: Repeatable Requests Version 1.0
Report-To W3C TR http://www.w3.org/TR/reporting-1: Reporting API 1
Repr-Digest RFC 9530: Digest Fields
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
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-Fetch-Dest W3C TR http://www.w3.org/TR/fetch-metadata: Fetch Metadata Request Headers
Sec-Fetch-Mode W3C TR http://www.w3.org/TR/fetch-metadata: Fetch Metadata Request Headers
Sec-Fetch-Site W3C TR http://www.w3.org/TR/fetch-metadata: Fetch Metadata Request Headers
Sec-Fetch-User W3C TR http://www.w3.org/TR/fetch-metadata: Fetch Metadata Request Headers
Sec-Token-Binding RFC 8473: Token Binding over HTTP
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
Server-Timing W3C TR http://www.w3.org/TR/server-timing: Server Timing
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-Cookie2 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 RFC 8594: The Sunset HTTP Header Field
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
TTL RFC 8030: Generic Event Delivery Using HTTP Push
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)
Topic RFC 8030: Generic Event Delivery Using HTTP Push
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
Upgrade-Insecure-Requests W3C TR http://www.w3.org/TR/upgrade-insecure-requests: Upgrade Insecure Requests
Upload-Incomplete Internet Draft draft-ietf-httpbis-resumable-upload: Resumable Uploads for HTTP
Upload-Offset Internet Draft draft-ietf-httpbis-resumable-upload: Resumable Uploads for HTTP
Urgency RFC 8030: Generic Event Delivery Using HTTP Push
User-Agent RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Variant-Key Internet Draft ietf-httpbis-variants: HTTP Variants
Variant-Vary RFC 2295: Transparent Content Negotiation in HTTP
Variants Internet Draft ietf-httpbis-variants: HTTP Variants
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
WWW-Authenticate2 RFC 7616: HTTP Digest Access Authentication
RFC 7235: Hypertext Transfer Protocol (HTTP/1.1): Authentication
Want-Content-Digest RFC 9530: Digest Fields
Want-Digest RFC 3230: Instance Digests in HTTP
Want-Repr-Digest RFC 9530: Digest Fields
Warning RFC 7234: Hypertext Transfer Protocol (HTTP/1.1): Caching
X-Frame-Options RFC 7034: HTTP Header Field X-Frame-Options
traceparent W3C TR http://www.w3.org/TR/trace-context: Trace Context
tracestate W3C TR http://www.w3.org/TR/trace-context: Trace Context
webhook-id Webhook Standard webhooks: Standard Webhooks
webhook-signature Webhook Standard webhooks: Standard Webhooks
webhook-timestamp Webhook Standard webhooks: Standard Webhooks



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