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 169–192 of 259 documents

Document	Version
Prefer Prefer is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Preference-Applied Preference-Applied is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Priority Priority is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
ProfileObject ProfileObject is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Protocol Protocol is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Protocol-Info Protocol-Info is a deprecated HTTP field name in the IANA HTTP Field Name Registry.	v1
Protocol-Query Protocol-Query is a deprecated HTTP field name in the IANA HTTP Field Name Registry.	v1
Protocol-Request Protocol-Request is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Proxy-Authenticate Proxy-Authenticate is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Proxy-Authentication-Info Proxy-Authentication-Info is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Proxy-Authorization Proxy-Authorization is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Proxy-Features Proxy-Features is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Proxy-Instruction Proxy-Instruction is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Proxy-Public-Address Proxy-Public-Address is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Proxy-Status Proxy-Status is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Public Public is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Public-Key-Pins Public-Key-Pins is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Public-Key-Pins-Report-Only Public-Key-Pins-Report-Only is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Range Range is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Redirect-Ref Redirect-Ref is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Referer Referer is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Referer-Root Referer-Root is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Referrer-Policy Referrer-Policy is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Refresh Refresh 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