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 Bormann Expires August 1, 2018 [Page 1] Internet-Draft The impl-info relation type January 2018 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. Bormann Expires August 1, 2018 [Page 2] Internet-Draft The impl-info relation type January 2018 4. References 4.1. Normative References [RFC8288] Nottingham, M., "Web Linking", RFC 8288, DOI 10.17487/RFC8288, October 2017, . [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, . [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, . [RFC7252] Shelby, Z., Hartke, K., and C. Bormann, "The Constrained Application Protocol (CoAP)", RFC 7252, DOI 10.17487/RFC7252, June 2014, . 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 Bormann Expires August 1, 2018 [Page 3] Internet-Draft The impl-info relation type January 2018 Carsten Bormann Universitaet Bremen TZI Postfach 330440 Bremen D-28359 Germany Phone: +49-421-218-63921 Email: cabo@tzi.org Bormann Expires August 1, 2018 [Page 4]