RFC 3864 Registration Procedures for Message Header Fields

BEST CURRENT PRACTICE · September 2004 · G. Klyne, M. Nottingham, J. Mogul

This specification defines registration procedures for the message header fields used by Internet mail, HTTP, Netnews and other applications. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.

Not ingested in full here — read it on rfc-editor.org.