RFC 4229 · INFORMATIONAL · 2005
SUN · 14 JUN 2026
HTTP Header Field Registrations
Overview
RFC 4229, “HTTP Header Field Registrations”, is an Informational document published in December 2005 by M. Nottingham, J. Mogul. The canonical text is published by the RFC Editor.
Abstract
This document defines the initial contents of a permanent IANA registry for HTTP header fields and a provisional repository for HTTP header fields, per RFC 3864. This memo provides information for the Internet community.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 4229 is hosted at rfc-editor.org. Available in TXT,HTML.
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