HTTP field names (IANA registry)

Registered HTTP field (header and trailer) names from the IANA Hypertext Transfer Protocol (HTTP) Field Name Registry, one document per name with its status, structured type, and defining reference.

Browse 259 documents Use with your agent

Documents

Showing 121–144 of 259 documents

Document	Version
If-Match If-Match is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
If-Modified-Since If-Modified-Since is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
If-None-Match If-None-Match is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
If-Range If-Range is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
If-Schedule-Tag-Match If-Schedule-Tag-Match is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
If-Unmodified-Since If-Unmodified-Since is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
IM IM is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Include-Referred-Token-Binding-ID Include-Referred-Token-Binding-ID is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Incremental Incremental is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Isolation Isolation is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
Keep-Alive Keep-Alive is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Label Label is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Last-Event-ID Last-Event-ID is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Last-Modified Last-Modified is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Link Link is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Link-Template Link-Template is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Location Location is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Lock-Token Lock-Token is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Man Man is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Max-Forwards Max-Forwards is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Memento-Datetime Memento-Datetime is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Meter Meter is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Method-Check Method-Check is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Method-Check-Expires Method-Check-Expires is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1

Source, review, and usage

Published on Koskamo by: Koskamo
Version: 260
Documents: 259 documents
Reviewed: 2026-10-04
Last approved change: 2026-10-04
Agent lookups: 2 in the last 90 days
Reuse: IANA HTTP Field Name Registry (iana.org/assignments/http-fields); registry data reproduced verbatim with references
Review status: Published by Koskamo; proposed revisions require Koskamo approval

Original sources are linked on each document. Owner approval records a publishing decision; it does not imply independent fact checking.

Use this dataset from an agent

Agents can query it without an account. POST to /api/v1/retrieve, or connect an MCP client and call koskamo_retrieve with dataset: "http-field-names".

Set up your agent Read documents as JSON

The JSON endpoint returns document text and source links in pages. Use limit and offset to retrieve more records; total gives the dataset size.

retrieve request

curl --fail-with-body 'https://koskamo.com/api/v1/retrieve' -H 'Content-Type: application/json' --data-raw '{"query":"http-field-names","dataset":"http-field-names","top_k":3}'

Change history

Every change that reached this dataset. Proposals from contributors land only after Koskamo approves them.

Published by Koskamo2026-10-04
* · v1
Published by Koskamo2026-10-04
X-Frame-Options · v1
Published by Koskamo2026-10-04
X-Content-Type-Options · v1
Published by Koskamo2026-10-04
WWW-Authenticate · v1
Published by Koskamo2026-10-04
Warning · v1
Published by Koskamo2026-10-04
Want-Unencoded-Digest · v1
Published by Koskamo2026-10-04
Want-Repr-Digest · v1
Published by Koskamo2026-10-04
Want-Digest · v1
Published by Koskamo2026-10-04
Want-Content-Digest · v1
Published by Koskamo2026-10-04
Via · v1