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 241–259 of 259 documents

Document	Version
Transfer-Encoding Transfer-Encoding is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
TTL TTL is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Unencoded-Digest Unencoded-Digest is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Upgrade Upgrade is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Urgency Urgency is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
URI URI is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Use-As-Dictionary Use-As-Dictionary is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
User-Agent User-Agent is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Variant-Vary Variant-Vary is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Vary Vary is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Via Via is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Want-Content-Digest Want-Content-Digest is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Want-Digest Want-Digest is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Want-Repr-Digest Want-Repr-Digest is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Want-Unencoded-Digest Want-Unencoded-Digest is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Warning Warning is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
WWW-Authenticate WWW-Authenticate is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
X-Content-Type-Options X-Content-Type-Options is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
X-Frame-Options X-Frame-Options is a permanent 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