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 49–72 of 259 documents

Document	Version
Capsule-Protocol Capsule-Protocol is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
CDN-Cache-Control CDN-Cache-Control is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
CDN-Loop CDN-Loop is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Cert-Not-After Cert-Not-After is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Cert-Not-Before Cert-Not-Before is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Clear-Site-Data Clear-Site-Data is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Client-Cert Client-Cert is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Client-Cert-Chain Client-Cert-Chain is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Close Close is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
CMCD-Object CMCD-Object is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
CMCD-Request CMCD-Request is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
CMCD-Session CMCD-Session is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
CMCD-Status CMCD-Status is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
CMSD-Dynamic CMSD-Dynamic is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
CMSD-Static CMSD-Static is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
Concealed-Auth-Export Concealed-Auth-Export is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Configuration-Context Configuration-Context is a provisional HTTP field name in the IANA HTTP Field Name Registry.	v1
Connect-UDP-Bind Connect-UDP-Bind is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Connection Connection is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Content-Base Content-Base is an obsoleted HTTP field name in the IANA HTTP Field Name Registry.	v1
Content-Digest Content-Digest is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Content-Disposition Content-Disposition is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Content-Encoding Content-Encoding is a permanent HTTP field name in the IANA HTTP Field Name Registry.	v1
Content-ID Content-ID 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