This document defines a separate IANA registry for HTTP header fields, and establishes the procedures for its operation. Note to Readers The issues list for this draft can be found at https://github.com/mnot/I-D/labels/httpbis-header-registry [1]. The most recent (often, unpublished) draft is at https://mnot.github.io/I-D/httpbis-header-registry/ [2]. Recent changes are listed at https://github.com/mnot/I-D/commits/gh- pages/httpbis-header-registry [3].