Internet Assigned Numbers Authority

Hypertext Transfer Protocol (HTTP) Field Name Registry

Created
2021-10-01
Last Updated
2022-05-03
Available Formats

XML

HTML

Plain text

Registry included below

Hypertext Transfer Protocol (HTTP) Field Name Registry

Registration Procedure(s)
Specification Required for Permanent registrations,
Expert Review for Provisional registrations. 
    
Expert(s)
Mark Nottingham, Roy Fielding
Reference
[RFC-ietf-httpbis-semantics-19]
Note
See Section 16.3 of [RFC-ietf-httpbis-semantics-19] for more
information on defining and registering new HTTP Fields.
    
Note
New field names, along with changes to existing ones, can be 
requested using the [registry interface] or the mailing list
defined in [RFC-ietf-httpbis-semantics-19].
    
Available Formats

CSV
Field Name Template Status Reference Comments
A-IM permanent [RFC3229]
Accept permanent [RFC-ietf-httpbis-semantics-19, Section 12.5.1]
Accept-Additions permanent [RFC2324]
Accept-CH permanent [RFC8942, Section 3.1]
Accept-Charset deprecated [RFC-ietf-httpbis-semantics-19, Section 12.5.2]
Accept-Datetime permanent [RFC7089]
Accept-Encoding permanent [RFC-ietf-httpbis-semantics-19, Section 12.5.3]
Accept-Features permanent [RFC2295]
Accept-Language permanent [RFC-ietf-httpbis-semantics-19, Section 12.5.4]
Accept-Patch permanent [RFC5789]
Accept-Post perm/accept-post permanent [https://www.w3.org/TR/ldp/]
Accept-Ranges permanent [RFC-ietf-httpbis-semantics-19, Section 14.3]
Access-Control obsoleted [https://www.w3.org/TR/2007/WD-access-control-20071126/#access-control0]
Access-Control-Allow-Credentials permanent [https://fetch.spec.whatwg.org/#http-access-control-allow-credentials]
Access-Control-Allow-Headers permanent [https://fetch.spec.whatwg.org/#http-access-control-allow-headers]
Access-Control-Allow-Methods permanent [https://fetch.spec.whatwg.org/#http-access-control-allow-methods]
Access-Control-Allow-Origin permanent [https://fetch.spec.whatwg.org/#http-access-control-allow-origin]
Access-Control-Expose-Headers permanent [https://fetch.spec.whatwg.org/#http-access-control-expose-headers]
Access-Control-Max-Age permanent [https://fetch.spec.whatwg.org/#http-access-control-max-age]
Access-Control-Request-Headers permanent [https://fetch.spec.whatwg.org/#http-access-control-request-headers]
Access-Control-Request-Method permanent [https://fetch.spec.whatwg.org/#http-access-control-request-method]
Age permanent [RFC-ietf-httpbis-cache-19, Section 5.1]
Allow permanent [RFC-ietf-httpbis-semantics-19, Section 10.2.1]
ALPN permanent [RFC7639, Section 2]
Alt-Svc permanent [RFC7838]
Alt-Used permanent [RFC7838]
Alternates permanent [RFC2295]
AMP-Cache-Transform provisional [https://github.com/ampproject/amphtml/blob/master/spec/amp-cache-transform.md]
Apply-To-Redirect-Ref permanent [RFC4437]
Authentication-Control permanent [RFC8053, Section 4]
Authentication-Info permanent [RFC-ietf-httpbis-semantics-19, Section 11.6.3]
Authorization permanent [RFC-ietf-httpbis-semantics-19, Section 11.6.2]
C-Ext obsoleted [RFC2774][status-change-http-experiments-to-historic]
C-Man obsoleted [RFC2774][status-change-http-experiments-to-historic]
C-Opt obsoleted [RFC2774][status-change-http-experiments-to-historic]
C-PEP obsoleted [https://www.w3.org/TR/WD-http-pep][status-change-http-experiments-to-historic]
C-PEP-Info deprecated [https://www.w3.org/TR/WD-http-pep][status-change-http-experiments-to-historic]
Cache-Control permanent [RFC-ietf-httpbis-cache-19, Section 5.2]
Cache-Status permanent [RFC-ietf-httpbis-cache-header-10]
Cal-Managed-ID permanent [RFC8607, Section 5.1]
CalDAV-Timezones permanent [RFC7809, Section 7.1]
CDN-Cache-Control permanent [RFC-ietf-httpbis-targeted-cache-control-04] Cache directives targeted at content delivery networks
CDN-Loop permanent [RFC8586]
Cert-Not-After permanent [RFC8739, Section 3.3]
Cert-Not-Before permanent [RFC8739, Section 3.3]
Clear-Site-Data permanent [https://w3.org/TR/clear-site-data/#header]
Close permanent [RFC-ietf-httpbis-messaging-19, Section 9.6] (reserved)
Configuration-Context provisional [https://docs.oasis-open-projects.org/oslc-op/config/v1.0/psd01/config-resources.html#configcontext]
Connection permanent [RFC-ietf-httpbis-semantics-19, Section 7.6.1]
Content-Base obsoleted [RFC2068][RFC2616]
Content-Disposition permanent [RFC6266]
Content-Encoding permanent [RFC-ietf-httpbis-semantics-19, Section 8.4]
Content-ID permanent [https://www.w3.org/TR/NOTE-drp]
Content-Language permanent [RFC-ietf-httpbis-semantics-19, Section 8.5]
Content-Length permanent [RFC-ietf-httpbis-semantics-19, Section 8.6]
Content-Location permanent [RFC-ietf-httpbis-semantics-19, Section 8.7]
Content-MD5 obsoleted [RFC2616, Section 14.15][RFC7231, Appendix B]
Content-Range permanent [RFC-ietf-httpbis-semantics-19, Section 14.4]
Content-Script-Type obsoleted [https://www.w3.org/TR/html401]
Content-Security-Policy permanent [https://www.w3.org/TR/CSP/#csp-header]
Content-Security-Policy-Report-Only permanent [https://www.w3.org/TR/CSP/#cspro-header]
Content-Style-Type obsoleted [https://www.w3.org/TR/html401]
Content-Type permanent [RFC-ietf-httpbis-semantics-19, Section 8.3]
Content-Version obsoleted [RFC2068]
Cookie permanent [RFC6265]
Cookie2 obsoleted [RFC2965][RFC6265]
Cross-Origin-Embedder-Policy permanent [https://html.spec.whatwg.org/multipage/origin.html#cross-origin-embedder-policy]
Cross-Origin-Embedder-Policy-Report-Only permanent [https://html.spec.whatwg.org/multipage/origin.html#cross-origin-embedder-policy-report-only]
Cross-Origin-Opener-Policy permanent [https://html.spec.whatwg.org/multipage/origin.html#cross-origin-opener-policy-2]
Cross-Origin-Opener-Policy-Report-Only permanent [https://html.spec.whatwg.org/multipage/origin.html#cross-origin-opener-policy-report-only]
Cross-Origin-Resource-Policy permanent [https://fetch.spec.whatwg.org/#cross-origin-resource-policy-header]
DASL permanent [RFC5323]
Date permanent [RFC-ietf-httpbis-semantics-19, Section 6.6.1]
DAV permanent [RFC4918]
Default-Style obsoleted [https://www.w3.org/TR/html401]
Delta-Base permanent [RFC3229]
Depth permanent [RFC4918]
Derived-From obsoleted [RFC2068]
Destination permanent [RFC4918]
Differential-ID permanent [https://www.w3.org/TR/NOTE-drp]
Digest permanent [RFC3230]
Early-Data permanent [RFC8470]
EDIINT-Features provisional [RFC6017]
ETag permanent [RFC-ietf-httpbis-semantics-19, Section 8.8.3]
Expect permanent [RFC-ietf-httpbis-semantics-19, Section 10.1.1]
Expect-CT permanent [RFC-ietf-httpbis-expect-ct-08]
Expires permanent [RFC-ietf-httpbis-cache-19, Section 5.3]
Ext obsoleted [RFC2774][status-change-http-experiments-to-historic]
Forwarded permanent [RFC7239]
From permanent [RFC-ietf-httpbis-semantics-19, Section 10.1.2]
GetProfile obsoleted [https://www.w3.org/TR/NOTE-OPS-OverHTTP]
Hobareg permanent [RFC7486, Section 6.1.1]
Host permanent [RFC-ietf-httpbis-semantics-19, Section 7.2]
HTTP2-Settings obsoleted [RFC7540, Section 3.2.1] Obsolete; see Section 11.1 of [RFC-ietf-httpbis-http2bis-07]
If permanent [RFC4918]
If-Match permanent [RFC-ietf-httpbis-semantics-19, Section 13.1.1]
If-Modified-Since permanent [RFC-ietf-httpbis-semantics-19, Section 13.1.3]
If-None-Match permanent [RFC-ietf-httpbis-semantics-19, Section 13.1.2]
If-Range permanent [RFC-ietf-httpbis-semantics-19, Section 13.1.5]
If-Schedule-Tag-Match permanent [RFC6638]
If-Unmodified-Since permanent [RFC-ietf-httpbis-semantics-19, Section 13.1.4]
IM permanent [RFC3229]
Include-Referred-Token-Binding-ID permanent [RFC8473]
Isolation prov/isolation provisional [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign]
Keep-Alive permanent [RFC2068]
Label permanent [RFC3253]
Last-Event-ID permanent [https://html.spec.whatwg.org/multipage/server-sent-events.html#last-event-id]
Last-Modified permanent [RFC-ietf-httpbis-semantics-19, Section 8.8.2]
Link permanent [RFC8288]
Location permanent [RFC-ietf-httpbis-semantics-19, Section 10.2.2]
Lock-Token permanent [RFC4918]
Man obsoleted [RFC2774][status-change-http-experiments-to-historic]
Max-Forwards permanent [RFC-ietf-httpbis-semantics-19, Section 7.6.2]
Memento-Datetime permanent [RFC7089]
Meter permanent [RFC2227]
Method-Check obsoleted [https://www.w3.org/TR/2007/WD-access-control-20071126/#method-check]
Method-Check-Expires obsoleted [https://www.w3.org/TR/2007/WD-access-control-20071126/#method-check-expires]
MIME-Version permanent [RFC-ietf-httpbis-messaging-19, Appendix B.1]
Negotiate permanent [RFC2295]
OData-EntityId perm/odata-entityid permanent [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign]
OData-Isolation perm/odata-isolation permanent [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign]
OData-MaxVersion perm/odata-maxversion permanent [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign]
OData-Version perm/odata-version permanent [OData Version 4.01 Part 1: Protocol][OASIS][Chet_Ensign]
Opt obsoleted [RFC2774][status-change-http-experiments-to-historic]
Optional-WWW-Authenticate permanent [RFC8053, Section 3]
Ordering-Type permanent [RFC3648]
Origin permanent [RFC6454]
Origin-Agent-Cluster permanent [https://html.spec.whatwg.org/multipage/origin.html#origin-agent-cluster]
OSCORE permanent [RFC8613, Section 11.1]
OSLC-Core-Version permanent [OASIS Project Specification 01][OASIS][Chet_Ensign]
Overwrite permanent [RFC4918]
P3P obsoleted [https://www.w3.org/TR/P3P]
PEP obsoleted [http://www.w3.org/TR/WD-http-pep]
Pep-Info obsoleted [http://www.w3.org/TR/WD-http-pep]
PICS-Label obsoleted [https://www.w3.org/TR/REC-PICS-labels-961031]
Ping-From permanent [https://html.spec.whatwg.org/multipage/links.html#ping-from]
Ping-To permanent [https://html.spec.whatwg.org/multipage/links.html#ping-to]
Position permanent [RFC3648]
Pragma deprecated [RFC-ietf-httpbis-cache-19, Section 5.4]
Prefer permanent [RFC7240]
Preference-Applied permanent [RFC7240]
Priority permanent [RFC-ietf-httpbis-priority-12]
ProfileObject obsoleted [https://www.w3.org/TR/NOTE-OPS-OverHTTP]
Protocol obsoleted [https://www.w3.org/TR/REC-PICS-labels-961031]
Protocol-Info deprecated [https://www.w3.org/TR/NOTE-jepi]
Protocol-Query deprecated [https://www.w3.org/TR/NOTE-jepi]
Protocol-Request obsoleted [https://www.w3.org/TR/REC-PICS-labels-961031]
Proxy-Authenticate permanent [RFC-ietf-httpbis-semantics-19, Section 11.7.1]
Proxy-Authentication-Info permanent [RFC-ietf-httpbis-semantics-19, Section 11.7.3]
Proxy-Authorization permanent [RFC-ietf-httpbis-semantics-19, Section 11.7.2]
Proxy-Features obsoleted [https://www.w3.org/TR/WD-proxy.html]
Proxy-Instruction obsoleted [https://www.w3.org/TR/WD-proxy.html]
Proxy-Status permanent [RFC-ietf-httpbis-proxy-status-08]
Public obsoleted [RFC2068]
Public-Key-Pins permanent [RFC7469]
Public-Key-Pins-Report-Only permanent [RFC7469]
Range permanent [RFC-ietf-httpbis-semantics-19, Section 14.2]
Redirect-Ref permanent [RFC4437]
Referer permanent [RFC-ietf-httpbis-semantics-19, Section 10.1.3]
Referer-Root obsoleted [https://www.w3.org/TR/2007/WD-access-control-20071126/#referer-root]
Refresh permanent [https://html.spec.whatwg.org/multipage/browsing-the-web.html#refresh]
Repeatability-Client-ID prov/repeatability-client-id provisional [Repeatable Requests Version 1.0][OASIS][Chet_Ensign]
Repeatability-First-Sent prov/repeatability-first-sent provisional [Repeatable Requests Version 1.0][OASIS][Chet_Ensign]
Repeatability-Request-ID prov/repeatability-request-id provisional [Repeatable Requests Version 1.0][OASIS][Chet_Ensign]
Repeatability-Result prov/repeatability-result provisional [Repeatable Requests Version 1.0][OASIS][Chet_Ensign]
Replay-Nonce permanent [RFC8555, Section 6.5.1]
Retry-After permanent [RFC-ietf-httpbis-semantics-19, Section 10.2.3]
Safe obsoleted [RFC2310][status-change-http-experiments-to-historic]
Schedule-Reply permanent [RFC6638]
Schedule-Tag permanent [RFC6638]
Sec-GPC Provisional [https://globalprivacycontrol.github.io/gpc-spec/]
Sec-Token-Binding permanent [RFC8473]
Sec-WebSocket-Accept permanent [RFC6455]
Sec-WebSocket-Extensions permanent [RFC6455]
Sec-WebSocket-Key permanent [RFC6455]
Sec-WebSocket-Protocol permanent [RFC6455]
Sec-WebSocket-Version permanent [RFC6455]
Security-Scheme obsoleted [RFC2660][status-change-http-experiments-to-historic]
Server permanent [RFC-ietf-httpbis-semantics-19, Section 10.2.4]
Server-Timing permanent [https://www.w3.org/TR/server-timing/]
Set-Cookie permanent [RFC6265]
Set-Cookie2 obsoleted [RFC2965][RFC6265]
SetProfile obsoleted [https://www.w3.org/TR/NOTE-OPS-OverHTTP]
SLUG permanent [RFC5023]
SoapAction permanent [https://www.w3.org/TR/2000/NOTE-SOAP-20000508]
Status-URI permanent [RFC2518]
Strict-Transport-Security permanent [RFC6797]
Sunset permanent [RFC8594]
Surrogate-Capability permanent [https://www.w3.org/TR/edge-arch]
Surrogate-Control permanent [https://www.w3.org/TR/edge-arch]
TCN permanent [RFC2295]
TE permanent [RFC-ietf-httpbis-semantics-19, Section 10.1.4]
Timeout permanent [RFC4918]
Timing-Allow-Origin prov/timing-allow-origin provisional [https://www.w3.org/TR/resource-timing-1/#timing-allow-origin]
Topic permanent [RFC8030, Section 5.4]
Traceparent permanent [https://www.w3.org/TR/trace-context/#traceparent-header]
Tracestate permanent [https://www.w3.org/TR/trace-context/#tracestate-header]
Trailer permanent [RFC-ietf-httpbis-semantics-19, Section 6.6.2]
Transfer-Encoding permanent [RFC-ietf-httpbis-messaging-19, Section 6.1]
TTL permanent [RFC8030, Section 5.2]
Upgrade permanent [RFC-ietf-httpbis-semantics-19, Section 7.8]
Urgency permanent [RFC8030, Section 5.3]
URI obsoleted [RFC2068]
User-Agent permanent [RFC-ietf-httpbis-semantics-19, Section 10.1.5]
Variant-Vary permanent [RFC2295]
Vary permanent [RFC-ietf-httpbis-semantics-19, Section 12.5.5]
Via permanent [RFC-ietf-httpbis-semantics-19, Section 7.6.3]
Want-Digest permanent [RFC3230]
Warning obsoleted [RFC-ietf-httpbis-cache-19, Section 5.5]
WWW-Authenticate permanent [RFC-ietf-httpbis-semantics-19, Section 11.6.1]
X-Content-Type-Options permanent [https://fetch.spec.whatwg.org/#x-content-type-options-header]
X-Frame-Options permanent [https://html.spec.whatwg.org/multipage/browsing-the-web.html#x-frame-options]
* permanent [RFC-ietf-httpbis-semantics-19, Section 12.5.5] (reserved)

Contact Information

ID Name Contact URI Last Updated
[Chet_Ensign] Chet Ensign mailto:chet.ensign&oasis-open.org 2020-09-01
[OASIS] OASIS https://www.oasis-open.org