The Deprecation HTTP Header Field
draft-dalal-deprecation-header-01

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Last updated 2019-06-17
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Network Working Group                                           S. Dalal
Internet-Draft
Intended status: Standards Track                                E. Wilde
Expires: December 19, 2019                                 June 17, 2019

                   The Deprecation HTTP Header Field
                   draft-dalal-deprecation-header-01

Abstract

   The HTTP Deprecation response header field can be used to signal to
   consumers of a URI-identified resource that the resource has been
   deprecated.  Additionally, the deprecation link relation can be used
   to link to a resource that provides additional context for the
   deprecation, and possibly ways in which clients can find a
   replacement for the deprecated resource.

Status of This Memo

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   This Internet-Draft will expire on December 19, 2019.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
   2.  The Deprecation HTTP Response Header Field  . . . . . . . . .   3
     2.1.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  The Deprecation Link Relation Type  . . . . . . . . . . . . .   4
     3.1.  Documentation . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Recommend Replacement . . . . . . . . . . . . . . . . . . . .   5
   5.  Sunset  . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Resource Behavior . . . . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  The Deprecation Response Header Field . . . . . . . . . .   6
     7.2.  The Deprecation Link Relation Type  . . . . . . . . . . .   7
   8.  Implementation Status . . . . . . . . . . . . . . . . . . . .   7
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   10. Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   9
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     11.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   Deprecation of a URI-identified resource is a technique to
   communicate information about the lifecycle of a resource.  It
   encourages applications to migrate away from the resource,
   discourages applications from forming new dependencies on the
   resource, and informs applications about the risk of continuing
   dependence upon the resource.

   The act of deprecation does not change any behavior of the resource.
   It just informs client of the fact that a resource is deprecated.
   The Deprecation HTTP response header field MAY be used to convey this
   fact at runtime to clients.  The header field can carry information
   indicating since when the deprecation is in effect.

   In addition to the Deprecation header field the resource provider can
   use other header fields to convey additional information related to
   deprecation.  For example, information such as where to find
   documentation related to the deprecation or what should be used as an
   alternate and when the deprecated resource would be unreachable, etc.
   Alternates of a resource can be similar resource(s) or a newer
   version of the same resource.

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