Network Working Group M. Nottingham
Internet-Draft E. Hammer-Lahav
Updates: 2616 2818 December 30, 2009
(if approved)
Intended status: Standards Track
Expires: July 3, 2010
Defining Well-Known URIs
draft-nottingham-site-meta-05
Abstract
This memo defines a path prefix for "well-known locations", "/.well-
known/" in selected URI schemes.
Status of this Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Appropriate Use of Well-Known URIs . . . . . . . . . . . . 3
2. Notational Conventions . . . . . . . . . . . . . . . . . . . . 3
3. Well-Known URIs . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
5.1. The Well-Known URI Registry . . . . . . . . . . . . . . . . 5
5.1.1. Registration Template . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1. Normative References . . . . . . . . . . . . . . . . . . . 6
6.2. Informative References . . . . . . . . . . . . . . . . . . 6
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . . 6
Appendix B. Frequently Asked Questions . . . . . . . . . . . . . . 7
B.1. Aren't well-known locations bad for the Web? . . . . . . . 7
B.2. Why /.well-known? . . . . . . . . . . . . . . . . . . . . . 7
B.3. What impact does this have on existing mechanisms,
such as P3P and robots.txt? . . . . . . . . . . . . . . . . 7
B.4. Why aren't per-directory well-known locations defined? . . 7
Appendix C. Document History . . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8
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1. Introduction
It is increasingly common for Web-based protocols to require the
discovery of policy or metadata before making a request. For
example, the Robots Exclusion Protocol
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 beforehand.
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.
When this happens, it is common to designate a "well-known location"
for such metadata, so that it can be easily located. However, this
approach has the drawback of risking collisions, both with other such
designated "well-known locations" and with pre-existing resources.
To address this, this memo defines a path prefix in HTTP(S) URIs for
these "well-known locations", "/.well-known/". Future specifications
that need to define a resource for such site-wide metadata can
register their use to avoid collisions and minimise impingement upon
sites' URI space.
1.1. Appropriate Use of Well-Known URIs
There are a number of possible ways that applications could use Well-
known URIs. However, in keeping with the Architecture of the World-
Wide Web [W3C.REC-webarch-20041215], well-known URIs are not intended
for general information retrieval, or establishment of large URI
name-spaces on the Web. Rather, they are designed to facilitate
discovery of information on a site when it isn't practical to use
other mechanisms; for example, when discovering policy that needs to
be evaluated before a resource is accessed, or when using multiple
round-trips is judged detrimental to performance.
As such, the well-known URI space was created with the expectation
that it will be used to make site-wide policy information and other
metadata available directly (if sufficiently concise), or provide
references to other URIs that provide such metadata.
2. Notational Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
3. Well-Known URIs
A well-known URI is a URI [RFC3986] whose path component begins with
the characters "/.well-known/", and whose scheme is "HTTP", "HTTPS",
or another scheme which has explicitly been specified to use well-
known URIs.
Applications that wish to mint new well-known URIs MUST register
them, following the procedures in Section 5.1.
For example, if an application registers the name 'example', the
corresponding well-known URI on 'http://www.example.com/' would be
'http://www.example.com/.well-known/example'.
Registered names MUST conform to the segment-nz production in
[RFC3986].
Note that this specification defines neither how to determine the
authority to use for a particular context, nor the scope of the
metadata discovered by dereferencing the well-known URI; both should
be defined by the application itself.
Typically, a registration will reference a specification that defines
the format and associated media type to be obtained by dereferencing
the well-known URI.
It MAY also contain additional information, such as the syntax of
additional path components, query strings and/or fragment identifiers
to be appended to the well-known URI, or protocol-specific details
(e.g., HTTP [RFC2616] method handling).
Note that this specification also does not define a format or media-
type for the resource located at "/.well-known/" and clients should
not expect a resource to exist at that location.
4. Security Considerations
This memo does not specify the scope of applicability of metadata or
policy obtained from a well-known URI, and does not specify how to
discover a well-known URI for a particular application. Individual
applications using this mechanism must define both aspects.
Applications minting new well-known URIs, as well as administrators
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deploying them, will need to consider several security-related
issues, including (but not limited to) exposure of sensitive data,
denial of service attacks (in addition to normal load issues), server
and client authentication, vulnerability to DNS rebinding attacks,
and attacks where limited access to a server grants the ability to
affect how well-known URIs are served.
5. IANA Considerations
5.1. The Well-Known URI Registry
This document establishes the well-known URI registry.
Well-known URIs are registered on the advice of one or more
Designated Experts (appointed by the IESG or their delegate), with a
Specification Required (using terminology from [RFC5226]). However,
to allow for the allocation of values prior to publication, the
Designated Expert(s) may approve registration once they are satisfied
that such a specification will be published.
Registration requests should be sent to the [TBD]@ietf.org mailing
list for review and comment, with an appropriate subject (e.g.,
"Request for well-known URI: example").
[[NOTE TO RFC-EDITOR: The name of the mailing list should be
determined in consultation with the IESG and IANA. Suggested name:
wellknown-uri-review. ]]
Before a period of 14 days has passed, the Designated Expert(s) will
either approve or deny the registration request, communicating this
decision both to the review list and to IANA. Denials should include
an explanation and, if applicable, suggestions as to how to make the
request successful. Registration requests that are undetermined for
a period longer than 21 days can be brought to the IESG's attention
(using the iesg@iesg.org mailing list) for resolution.
5.1.1. Registration Template
URI suffix: The name requested for the well-known URI, relative to
"/.well-known/"; e.g., "example".
Change controller: For standards-track RFCs, state "IETF". For
others, give the name of the responsible party. Other details
(e.g., postal address, e-mail address, home page URI) may also be
included.
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Specification document(s): Reference to document that specifies the
field, preferably including a URI that can be used to retrieve a
copy of the document. An indication of the relevant sections may
also be included, but is not required.
Related information: Optionally, citations to additional documents
containing further relevant information.
6. References
6.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC 3986, January 2005.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
6.2. Informative References
[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.
[RFC4918] Dusseault, L., "HTTP Extensions for Web Distributed
Authoring and Versioning (WebDAV)", RFC 4918, June 2007.
[W3C.REC-P3P-20020416]
Marchiori, M., "The Platform for Privacy Preferences 1.0
(P3P1.0) Specification", W3C REC REC-P3P-20020416,
April 2002.
[W3C.REC-webarch-20041215]
Jacobs, I. and N. Walsh, "Architecture of the World Wide
Web, Volume One", World Wide Web Consortium
Recommendation REC-webarch-20041215, December 2004,
.
Appendix A. Acknowledgements
We would like to acknowledge the contributions of everyone who
provided feedback and use cases for this draft; in particular, Phil
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Archer, Dirk Balfanz, Adam Barth, Tim Bray, Brian Eaton, Brad
Fitzpatrick, Joe Gregorio, Paul Hoffman, Barry Leiba, Ashok Malhotra,
Breno de Medeiros, John Panzer, and Drummond Reed. However, they are
not responsible for errors and omissions.
Appendix B. Frequently Asked Questions
B.1. Aren't well-known locations bad for the Web?
They are, but for various reasons -- both technical and social --
they are commonly used, and their use is increasing. This memo
defines a "sandbox" for them, to reduce the risks of collision and to
minimise the impact upon pre-existing URIs on sites.
B.2. Why /.well-known?
It's short, descriptive and according to search indices, not widely
used.
B.3. What impact does this have on existing mechanisms, such as P3P and
robots.txt?
None, until they choose to use this mechanism.
B.4. Why aren't per-directory well-known locations defined?
Allowing every URI path segment to have a well-known location (e.g.,
"/images/.well-known/") would increase the risks of colliding with a
pre-existing URI on a site, and generally these solutions are found
not to scale well, because they're too "chatty".
Appendix C. Document History
[[RFC Editor: please remove this section before publication.]]
o -05
* Note that lack of a decision by the expert can be appealed to
the IESG.
* Clarify status of specifications suitable for registration.
* Add reference for Robots Exclusion Protocol.
* Clarify appropriate use cases.
o -04
* Restrict to HTTP(S) by default.
* Shorten review SLA to 14 days.
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* Allow for multiple designated experts.
* Identify mailing list for request submission and discussion.
o -03
* Add fragment identifiers to list of things an application might
define.
* Note that the /.well-known/ URI doesn't have anything there.
o -02
* Rewrote to just define a namespace for well-known URIs.
* Changed discussion forum to apps-discuss.
o -01
* Changed "site-meta" to "host-meta" after feedback.
* Changed from XML to text-based header-like format.
* Remove capability for generic inline content.
* Added registry for host-meta fields.
* Clarified scope of metadata application.
* Added security consideration about HTTP vs. HTTPS, expanding
scope.
Authors' Addresses
Mark Nottingham
Email: mnot@mnot.net
URI: http://www.mnot.net/
Eran Hammer-Lahav
Email: eran@hueniverse.com
URI: http://hueniverse.com/
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