Defining Well-Known Uniform Resource Identifiers (URIs)
draft-nottingham-rfc5785bis-04

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Last updated 2018-02-14
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Network Working Group                                      M. Nottingham
Internet-Draft                                         February 15, 2018
Obsoletes: 5785 (if approved)
Intended status: Standards Track
Expires: August 19, 2018

        Defining Well-Known Uniform Resource Identifiers (URIs)
                     draft-nottingham-rfc5785bis-04

Abstract

   This memo defines a path prefix for "well-known locations", "/.well-
   known/", in selected Uniform Resource Identifier (URI) schemes.

Note to Readers

   _RFC EDITOR: please remove this section before publication_

   This draft is a proposed revision of RFC5875.

   The issues list for this draft can be found at
   https://github.com/mnot/I-D/labels/rfc5785bis [1].

   The most recent (often, unpublished) draft is at
   https://mnot.github.io/I-D/rfc5785bis/ [2].

   Recent changes are listed at https://github.com/mnot/I-D/commits/gh-
   pages/rfc5785bis [3].

   See also the draft's current status in the IETF datatracker, at
   https://datatracker.ietf.org/doc/draft-nottingham-rfc5785bis/ [4].

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

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   This Internet-Draft will expire on August 19, 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
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   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Appropriate Use of Well-Known URIs  . . . . . . . . . . .   3
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . .   4
   3.  Well-Known URIs . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  The Well-Known URI Registry . . . . . . . . . . . . . . .   5
       5.1.1.  Registration Template . . . . . . . . . . . . . . . .   6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   7
     6.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   Appendix A.  Frequently Asked Questions . . . . . . . . . . . . .   8
   Appendix B.  Changes from RFC5785 . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Some applications on the Web require the discovery of information
   about an origin [RFC6454] (sometimes called "site-wide metadata")
   before making a request.  For example, the Robots Exclusion Protocol
   (http://www.robotstxt.org/ [5]) specifies a way for automated
   processes to obtain permission to access resources; likewise, the
   Platform for Privacy Preferences [W3C.REC-P3P-20020416] tells user-
   agents how to discover privacy policy before interacting with an
   origin server.

   While there are several ways to access per-resource metadata (e.g.,
   HTTP headers, WebDAV's PROPFIND [RFC4918]), the perceived overhead

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   (either in terms of client-perceived latency and/or deployment
   difficulties) associated with them often precludes their use in these
   scenarios.

   When this happens, one solution is designating a "well-known
   location" for data or services related to the origin overall, so that
   it can be easily located.  However, this approach has the drawback of
   risking collisions, both with other such designated "well-known
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