Well-Known Uniform Resource Identifiers (URIs)
draft-nottingham-rfc5785bis-07

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Last updated 2018-07-31
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Network Working Group                                      M. Nottingham
Internet-Draft                                            August 1, 2018
Obsoletes: 5785, 8307 (if approved)
Intended status: Standards Track
Expires: February 2, 2019

             Well-Known Uniform Resource Identifiers (URIs)
                     draft-nottingham-rfc5785bis-07

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   The most recent (often, unpublished) draft is at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
   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."

Nottingham              Expires February 2, 2019                [Page 1]
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   This Internet-Draft will expire on February 2, 2019.

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
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . .   3
   3.  Well-Known URIs . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Registering Well-Known URIs . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
     4.1.  Interaction with Web Browsing . . . . . . . . . . . . . .   5
     4.2.  Scoping Applications  . . . . . . . . . . . . . . . . . .   7
     4.3.  Hidden Capabilities . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  The Well-Known URI Registry . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   8
     6.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Appendix A.  Frequently Asked Questions . . . . . . . . . . . . .  10
   Appendix B.  Changes from RFC5785 . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

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 [P3P] tells user-agents how to
   discover privacy policy before interacting with an origin server.

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   While there are several ways to access per-resource metadata (e.g.,
   HTTP headers, WebDAV's PROPFIND [RFC4918]), the perceived overhead
   (either in terms of client-perceived latency and/or deployment
   difficulties) associated with them often precludes their use in these
   scenarios.

   At the same time, it has become more popular to use HTTP as a
   substrate for non-Web protocols.  Sometimes, such protocols need a
   way to locate one or more resources on a given host.
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