HTTP Alternative Services
draft-ietf-httpbis-alt-svc-05
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Active Internet-Draft (httpbis WG)
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2014-12-01
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draft-nottingham-httpbis-alt-svc
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IETF
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WG Document
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Mark Nottingham
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HTTPbis Working Group M. Nottingham
Internet-Draft Akamai
Intended status: Standards Track P. McManus
Expires: June 4, 2015 Mozilla
J. Reschke
greenbytes
December 1, 2014
HTTP Alternative Services
draft-ietf-httpbis-alt-svc-05
Abstract
This document specifies "alternative services" for HTTP, which allow
an origin's resources to be authoritatively available at a separate
network location, possibly accessed with a different protocol
configuration.
Editorial Note (To be removed by RFC Editor)
Discussion of this draft takes place on the HTTPBIS working group
mailing list (ietf-http-wg@w3.org), which is archived at
<https://lists.w3.org/Archives/Public/ietf-http-wg/>.
Working Group information can be found at
<https://tools.ietf.org/wg/httpbis/> and <http://httpwg.github.io/>;
source code and issues list for this draft can be found at
<https://github.com/httpwg/http-extensions>.
The changes in this draft are summarized in Appendix A.
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 June 4, 2015.
Nottingham, et al. Expires June 4, 2015 [Page 1]
Internet-Draft HTTP Alternative Services December 2014
Copyright Notice
Copyright (c) 2014 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.
Nottingham, et al. Expires June 4, 2015 [Page 2]
Internet-Draft HTTP Alternative Services December 2014
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Notational Conventions . . . . . . . . . . . . . . . . . . 4
2. Alternative Services Concepts . . . . . . . . . . . . . . . . 5
2.1. Host Authentication . . . . . . . . . . . . . . . . . . . 6
2.2. Alternative Service Caching . . . . . . . . . . . . . . . 7
2.3. Requiring Server Name Indication . . . . . . . . . . . . . 7
2.4. Using Alternative Services . . . . . . . . . . . . . . . . 7
3. The Alt-Svc HTTP Header Field . . . . . . . . . . . . . . . . 8
3.1. Caching Alt-Svc Header Field Values . . . . . . . . . . . 10
4. The ALTSVC HTTP/2 Frame . . . . . . . . . . . . . . . . . . . 10
5. The Alt-Used HTTP Header Field . . . . . . . . . . . . . . . . 11
6. The 421 Misdirected Request HTTP Status Code . . . . . . . . . 12
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
7.1. Header Field Registrations . . . . . . . . . . . . . . . . 12
7.2. The ALTSVC HTTP/2 Frame Type . . . . . . . . . . . . . . . 13
8. Internationalization Considerations . . . . . . . . . . . . . 13
9. Security Considerations . . . . . . . . . . . . . . . . . . . 13
9.1. Changing Ports . . . . . . . . . . . . . . . . . . . . . . 13
9.2. Changing Hosts . . . . . . . . . . . . . . . . . . . . . . 14
9.3. Changing Protocols . . . . . . . . . . . . . . . . . . . . 14
9.4. Tracking Clients Using Alternative Services . . . . . . . 15
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15
11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
11.1. Normative References . . . . . . . . . . . . . . . . . . . 15
11.2. Informative References . . . . . . . . . . . . . . . . . . 16
Appendix A. Change Log (to be removed by RFC Editor before
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