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+Internet Engineering Task Force (IETF)                 S. Moonesamy, Ed.
+Request for Comments: 6694                                   August 2012
+Category: Informational
+ISSN: 2070-1721
+
+
+                         The "about" URI Scheme
+
+Abstract
+
+   This document describes the "about" URI scheme, which is widely used
+   by Web browsers and some other applications to designate access to
+   their internal resources, such as settings, application information,
+   hidden built-in functionality, and so on.
+
+Status of This Memo
+
+   This document is not an Internet Standards Track specification; it is
+   published for informational purposes.
+
+   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).  Not all documents
+   approved by the IESG are a candidate for any level of Internet
+   Standard; see 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/rfc6694.
+
+Copyright Notice
+
+   Copyright (c) 2012 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.
+
+
+
+
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+Moonesamy                     Informational                     [Page 1]
+
+RFC 6694                 The "about" URI Scheme              August 2012
+
+
+Table of Contents
+
+   1. Introduction ....................................................2
+   2. URI Scheme Specification ........................................2
+      2.1. URI Scheme Syntax ..........................................2
+      2.2. URI Scheme Semantics .......................................3
+           2.2.1. Well-Known "about" URIs .............................3
+      2.3. Encoding Considerations ....................................3
+   3. "about:blank" ...................................................3
+   4. Security Considerations .........................................3
+   5. IANA Considerations .............................................4
+      5.1. URI Scheme Registration ....................................4
+      5.2. A Registry for Well-Known Tokens ...........................5
+           5.2.1. Registration Procedure ..............................5
+   6. References ......................................................6
+      6.1. Normative References .......................................6
+      6.2. Informative References .....................................6
+   Appendix A. Acknowledgments ........................................7
+
+1.  Introduction
+
+   This document describes the "about" Uniform Resource Identifier (URI)
+   scheme.  The "about" URI scheme is currently widely used by Web
+   browsers to designate access to their internal resources, such as
+   settings, application information, and so-called "Easter eggs" (i.e.,
+   a hidden feature or joke in an application).
+
+2.  URI Scheme Specification
+
+2.1.  URI Scheme Syntax
+
+   The "about" URI syntactically conforms to the <about-uri> rule below,
+   expressed using the Augmented Backus-Naur Form (ABNF) [RFC5234]:
+
+     about-uri = "about:" about-token [ about-query ] [ about-fragment ]
+     about-token = *pchar
+     about-query = "?" query
+     about-fragment = "#" fragment
+     pchar     = <as specified in RFC 3986, Appendix A>
+     query     = <as specified in RFC 3986, Appendix A>
+     fragment  = <as specified in RFC 3986, Appendix A>
+
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+Moonesamy                     Informational                     [Page 2]
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+RFC 6694                 The "about" URI Scheme              August 2012
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+2.2.  URI Scheme Semantics
+
+   The resource that is referenced by a particular "about" URI is
+   denoted by the <about-token> part of the URI.  It is not a
+   hierarchical element for a naming authority.  The <about-query> part
+   specifies additional information about its handling and/or the
+   information that should be returned by the resource referenced by
+   the URI.
+
+   It is impossible to specify a binding between all the possible tokens
+   and the semantics of "about" URIs that would contain such tokens.
+   Therefore, the resource referenced by the URI is generally considered
+   to be specific to a Web browser implementation.
+
+2.2.1.  Well-Known "about" URIs
+
+   Some <about-token>s have been reserved, as the behavior of the
+   resource that is referenced is well-known (well-known tokens).
+
+   A well-known "about" URI is a URI that has a well-known token as its
+   <about-token> part.  It is recommended that such URIs be handled in
+   accordance with the specification referenced in the "about" URI
+   Tokens registry (see Section 5.2).
+
+   Well-known "about" URIs are intended to be registered when there is a
+   need to codify the behavior of a particular <about-token>.
+
+2.3.  Encoding Considerations
+
+   "about" URIs are subject to encoding rules as defined in RFC 3986
+   [RFC3986].
+
+3.  "about:blank"
+
+   This document defines one well-known token: "blank".  The
+   "about:blank" URI refers to a resource represented in the browser by
+   a blank page.
+
+4.  Security Considerations
+
+   Security considerations for URIs are discussed in Section 7 of
+   RFC 3986 [RFC3986].  However, most of those provisions do not apply
+   to the "about" URI scheme, as they are mainly scoped to schemes used
+   in the Internet.
+
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+Moonesamy                     Informational                     [Page 3]
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+RFC 6694                 The "about" URI Scheme              August 2012
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+   "about" URIs can sometimes refer to sensitive information, such as
+   user passwords stored in a cache, or parameters that, if changed,
+   could affect a user's data.  The application therefore needs to
+   ensure that the user's data is secured and no threats are imposed by
+   "about" URIs.
+
+5.  IANA Considerations
+
+5.1.  URI Scheme Registration
+
+   The "about" URI scheme has been registered in the "Permanent URI
+   Schemes" registry.  The information below is provided according to
+   the guidelines from RFC 4395 [RFC4395]:
+
+      URI scheme name: about
+
+      Status: Permanent
+
+      URI scheme syntax: See Section 2.1 of RFC 6694.
+
+      URI scheme semantics: See Section 2.2 of RFC 6694.
+
+      URI scheme encoding considerations: See Section 2.3 of RFC 6694.
+
+      Applications that use the scheme: "about" URIs are predominantly
+         used by Web browsers.
+
+      Security considerations: See Section 4 of RFC 6694.
+
+      Contact: IETF Applications Area Directors
+         <app-ads@tools.ietf.org>
+
+      Author/Change controller: IESG <iesg@ietf.org> (on behalf of the
+         IETF)
+
+      References: See Section 6 of RFC 6694.
+
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+Moonesamy                     Informational                     [Page 4]
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+RFC 6694                 The "about" URI Scheme              August 2012
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+5.2.  A Registry for Well-Known Tokens
+
+   This document creates the '"about" URI Tokens' registry.
+
+   The registry entries consist of three fields: Token, Description, and
+   Reference.  The Token field has to conform to <about-token>
+   production as defined in Section 2.1.  The initial assignment is as
+   follows:
+
+   +--------------+------------------------------------+-------------+
+   | Token        | Description                        | Reference   |
+   +--------------+------------------------------------+-------------+
+   | blank        | The about:blank URI references a   | RFC 6694    |
+   |              | blank page.                        |             |
+   +--------------+------------------------------------+-------------+
+
+5.2.1.  Registration Procedure
+
+   The registration policy for this registry is "First Come First
+   Served", as described in RFC 5226 [RFC5226].  The registrant of the
+   token should provide the information mentioned in the following
+   registration template:
+
+   o  Registered token:  The desired well-known token to be used in
+      "about" URIs.
+
+   o  Intended usage:  A short description of how "about" URIs with the
+      registered token are handled, including information about the
+      referenced resource.
+
+   o  Contact/change controller:  Person (including contact information)
+      authorized to change this registration.
+
+   o  Specification:  A stable reference to a document that specifies
+      the registered "about" URI.  The question of interoperability does
+      not arise.  The key motivation is to have a reference to a
+      specification documenting well-known behavior of the "about" URI
+      in Web browsers.  As a rule of thumb, if the behavior is common to
+      two or more Web browser implementations, it can be considered
+      well-known.  An existing assignment may be duplicated if the
+      registered token is used in more than one Web browser
+      implementation.
+
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+Moonesamy                     Informational                     [Page 5]
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+RFC 6694                 The "about" URI Scheme              August 2012
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+   The following is a template for the "blank" token:
+
+   o  Registered token:  blank
+
+   o  Intended usage:  The about:blank URI references a blank page.
+
+   o  Contact/change controller:  IESG <iesg@ietf.org> (on behalf of the
+      IETF).
+
+   o  Specification:  RFC 6694
+
+6.  References
+
+6.1.  Normative References
+
+   [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.
+
+   [RFC5234]   Crocker, D., Ed., and P. Overell, "Augmented BNF for
+               Syntax Specifications: ABNF", STD 68, RFC 5234,
+               January 2008.
+
+6.2.  Informative References
+
+   [RFC4395]   Hansen, T., Hardie, T., and L. Masinter, "Guidelines and
+               Registration Procedures for New URI Schemes", BCP 35,
+               RFC 4395, February 2006.
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+Moonesamy                     Informational                     [Page 6]
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+RFC 6694                 The "about" URI Scheme              August 2012
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+Appendix A.  Acknowledgments
+
+   This document was formed from a previous draft document initially
+   authored by Lachlan Hunt and Joseph Holsten.  Additionally, the
+   contributions of Frank Ellermann and Alexey Melnikov are gratefully
+   acknowledged.  Barry Leiba and Murray Kucherawy deserve special
+   credit for providing a great amount of text that was used in this
+   document.
+
+   Lachlan Hunt and Mykyta Yevstifeyev edited previous versions of this
+   document.  Tim Bray and John Klensin provided suggestions about how
+   to improve the document.
+
+Author's Address
+
+   S. Moonesamy (editor)
+   76 Ylang Ylang Avenue
+   Quatre Bornes
+   Mauritius
+
+   EMail: sm+ietf@elandsys.com
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+Moonesamy                     Informational                     [Page 7]
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