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 145–168 of 259 documents

Document	Version
MIME-Version MIME-Version is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Negotiate Negotiate is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
NEL NEL is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
OData-EntityId OData-EntityId is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
OData-Isolation OData-Isolation is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
OData-MaxVersion OData-MaxVersion is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
OData-Version OData-Version is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Opt Opt is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Optional-WWW-Authenticate Optional-WWW-Authenticate is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Ordering-Type Ordering-Type is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Origin Origin is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Origin-Agent-Cluster Origin-Agent-Cluster is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
OSCORE OSCORE is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
OSLC-Core-Version OSLC-Core-Version is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Overwrite Overwrite is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
P3P P3P is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
PEP PEP is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
PEP-Info PEP-Info is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Permissions-Policy Permissions-Policy is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
PICS-Label PICS-Label is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Ping-From Ping-From is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Ping-To Ping-To is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Position Position is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Pragma Pragma is a deprecated 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