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Network Working Group                                         C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Informational                          January 28, 2018
Expires: August 1, 2018


     impl-info: A link relation type for disclosing implementation
                              information
                    draft-bormann-t2trg-rel-impl-00

Abstract

   When debugging an interoperability problem, it is often helpful to
   have information about the implementation version of a peer.  To
   enable the disclosure of such information, HTTP defines header fields
   such as Server and User-Agent.

   In CoAP, it is rarely appropriate to send information of this kind in
   every request or response.  Instead, the present specification
   defines a link relation type, impl-info, that can be used to convey
   this information via the self-description capabilities of the /.well-
   known/core resource and the CoRE resource directory.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 1, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of



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   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  IANA Consideration  . . . . . . . . . . . . . . . . . . . . .   2
   3.  Security considerations . . . . . . . . . . . . . . . . . . .   2
   4.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     4.2.  Informative References  . . . . . . . . . . . . . . . . .   3
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   3

1.  Introduction

   (TO DO: Insert an extended form of the abstract first here, expanding
   the references to [RFC7231], [RFC7252], [RFC6690], and
   [I-D.ietf-core-resource-directory] in the process.)

2.  IANA Consideration

   This specification requests the registration of the link relation
   type "impl-info".

   The registration template as per [RFC8288] follows.

   o  _Relation Name_: impl-info

   o  _Description_: Refers to implementation information that may be
      helpful in diagnosing technical problems with the implementation
      of the context, such as lists of components and their
      implementation versions.

   o  _Reference_: [THIS]

3.  Security considerations

   The security considerations listed in Section 9.6 of [RFC7231] and
   the sections referenced there apply.







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4.  References

4.1.  Normative References

   [RFC8288]  Nottingham, M., "Web Linking", RFC 8288,
              DOI 10.17487/RFC8288, October 2017,
              <https://www.rfc-editor.org/info/rfc8288>.

   [THIS]     Bormann, C., "impl-info: A link relation type for
              disclosing implementation information", draft-bormann-
              t2trg-rel-impl-00 (work in progress), January 2018.

4.2.  Informative References

   [I-D.ietf-core-resource-directory]
              Shelby, Z., Koster, M., Bormann, C., Stok, P., and C.
              Amsuess, "CoRE Resource Directory", draft-ietf-core-
              resource-directory-12 (work in progress), October 2017.

   [RFC6690]  Shelby, Z., "Constrained RESTful Environments (CoRE) Link
              Format", RFC 6690, DOI 10.17487/RFC6690, August 2012,
              <https://www.rfc-editor.org/info/rfc6690>.

   [RFC7231]  Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
              Protocol (HTTP/1.1): Semantics and Content", RFC 7231,
              DOI 10.17487/RFC7231, June 2014,
              <https://www.rfc-editor.org/info/rfc7231>.

   [RFC7252]  Shelby, Z., Hartke, K., and C. Bormann, "The Constrained
              Application Protocol (CoAP)", RFC 7252,
              DOI 10.17487/RFC7252, June 2014,
              <https://www.rfc-editor.org/info/rfc7252>.

Acknowledgements

   The need for implementation information in the CoRE resource
   directory has been identified by Peter van der Stok.  Discussions
   with Peter and with Christian Amsuess led to the present proposal of
   employing self-description for this purpose.

Author's Address










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   Carsten Bormann
   Universitaet Bremen TZI
   Postfach 330440
   Bremen  D-28359
   Germany

   Phone: +49-421-218-63921
   Email: cabo@tzi.org











































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