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Versions: 00 01
Network Working Group T. Bray
Internet-Draft Google
Updates: 2616 (if approved) June 11, 2012
Intended status: Standards Track
Expires: December 13, 2012
A New HTTP Status Code for Legally-restricted Resources
draft-tbray-http-legally-restricted-status-00
Abstract
This document specifies an additional Hypertext Transfer Protocol
(HTTP) status code for use when resource access is denied for legal
reasons.
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 http://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."
This Internet-Draft will expire on December 13, 2012.
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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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. 451 Unavailable For Legal Reasons . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . . 4
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 5
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1. Introduction
This document specifies an additional Hypertext Transfer Protocol
(HTTP) status code for use when resource access is denied for legal
reasons. This allows server operators to operate with greater
transparency in circumstances where issues of law or public policy
affect their operation. This transparency may be beneficial both to
these operators and to end users.
Feedback should occur on the ietf-http-wg@w3.org mailing list,
although this draft is NOT a work item of the IETF HTTPbis Working
Group.
2. Requirements
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
3. 451 Unavailable For Legal Reasons
This status code indicates that the server is subject to legal
restrictions which prevent it servicing the request.
Since such restrictions typically apply to all operators in a legal
jurisdiction, the server in question may or may not be an origin
server. The restrictions typically most directly affect the
operations of ISPs and search engines.
Responses using this status code SHOULD include an explanation, in
the response body, of the details of the legal restriction; which
legal authority is imposing it, and what class of resources it
applies to. For example:
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HTTP/1.1 451 Unavailable For Legal Reasons
Content-Type: text/html
<html>
<head>
<title>Unavailable For Legal Reasons</title>
</head>
<body>
<h1>Unavailable For Legal Reasons</h1>
<p>This request may not be serviced in the Roman Province of
Judea due to Lex3515, the Legem Ne Subversionem Act of AUC755,
which disallows access to resources hosted on servers deemed
to be operated by the Judean Liberation Front.</p>
</body>
</html>
The use of the 451 status code implies neither the existence nor non-
existence of the resource named in the request. That is to say, it
is possible that if the legal restriction were removed, a request for
the resource might still not succeed.
4. Security Considerations
4.1. 451 Unavailable for Legal Reasons
The 451 status code is optional; clients cannot rely upon its use.
It is imaginable that certain legal authorities may wish to avoid
transparency, and not only forbid access to certain resources, but
also disclosure that the restriction exists.
5. IANA Considerations
The HTTP Status Codes Registry should be updated with the following
entries:
o Code: 451
o Description: Unavailable for Legal Reasons
o Specification: [ this document ]
6. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
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Appendix A. Acknowledgements
Thanks to Terence Eden, whose blog observed that the existing status
code 403 was not really suitable for this situation, and suggested
the creation of a new status code
Thanks also to Ray Bradbury.
The author takes all responsibility for errors and omissions.
Author's Address
Tim Bray
Google
Email: tbray@textuality.com
URI: http://www.tbray.org/ongoing/
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