Locating Services for Calendaring Extensions to WebDAV (CalDAV) and vCard Extensions to WebDAV (CardDAV)
RFC 6764

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Internet Engineering Task Force (IETF)                          C. Daboo
Request for Comments: 6764                                    Apple Inc.
Updates: 4791, 6352                                        February 2013
Category: Standards Track
ISSN: 2070-1721

            Locating Services for Calendaring Extensions to
        WebDAV (CalDAV) and vCard Extensions to WebDAV (CardDAV)

Abstract

   This specification describes how DNS SRV records, DNS TXT records,
   and well-known URIs can be used together or separately to locate
   CalDAV (Calendaring Extensions to Web Distributed Authoring and
   Versioning (WebDAV)) or CardDAV (vCard Extensions to WebDAV)
   services.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6764.

Copyright Notice

   Copyright (c) 2013 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   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.

Daboo                        Standards Track                    [Page 1]
RFC 6764                SRV for CalDAV & CardDAV           February 2013

Table of Contents

   1. Introduction ....................................................2
   2. Conventions Used in This Document ...............................3
   3. CalDAV SRV Service Labels .......................................3
   4. CalDAV and CardDAV Service TXT Records ..........................4
   5. CalDAV and CardDAV Service Well-Known URI .......................4
      5.1. Example: Well-Known URI Redirects to Actual
           "Context Path" .............................................5
   6. Client "Bootstrapping" Procedures ...............................5
   7. Guidance for Service Providers ..................................8
   8. Security Considerations .........................................9
   9. IANA Considerations .............................................9
      9.1. Well-Known URI Registrations ...............................9
           9.1.1. caldav Well-Known URI Registration .................10
           9.1.2. carddav Well-Known URI Registration ................10
      9.2. Service Name Registrations ................................10
           9.2.1. caldav Service Name Registration ...................10
           9.2.2. caldavs Service Name Registration ..................11
           9.2.3. carddav Service Name Registration ..................11
           9.2.4. carddavs Service Name Registration .................12
   10. Acknowledgments ...............................................12
   11. References ....................................................12
      11.1. Normative References .....................................12
      11.2. Informative References ...................................14

1.  Introduction

   [RFC4791] defines the CalDAV calendar access protocol, based on HTTP
   [RFC2616], for accessing calendar data stored on a server.  CalDAV
   clients need to be able to discover appropriate CalDAV servers within
   their local area network and at other domains, e.g., to minimize the
   need for end users to know specific details such as the fully
   qualified domain name (FQDN) and port number for their servers.

   [RFC6352] defines the CardDAV address book access protocol based on
   HTTP [RFC2616], for accessing contact data stored on a server.  As
   with CalDAV, clients also need to be able to discover CardDAV
   servers.

   [RFC2782] defines a DNS-based service discovery protocol that has
   been widely adopted as a means of locating particular services within
   a local area network and beyond, using DNS SRV Resource Records
   (RRs).  This has been enhanced to provide additional service meta-
   data by use of DNS TXT RRs as per [RFC6763].

Daboo                        Standards Track                    [Page 2]
RFC 6764                SRV for CalDAV & CardDAV           February 2013

   This specification defines new SRV service types for the CalDAV