HTTP Alternative Services
draft-ietf-httpbis-alt-svc-13

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HTTP Working Group                                         M. Nottingham
Internet-Draft                                                    Akamai
Intended status: Standards Track                              P. McManus
Expires: September 2, 2016                                       Mozilla
                                                              J. Reschke
                                                              greenbytes
                                                           March 1, 2016

                       HTTP Alternative Services
                     draft-ietf-httpbis-alt-svc-13

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 <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 September 2, 2016.

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Copyright Notice

   Copyright (c) 2016 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 . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Notational Conventions . . . . . . . . . . . . . . . . . .  4
   2.  Alternative Services Concepts  . . . . . . . . . . . . . . . .  5
     2.1.  Host Authentication  . . . . . . . . . . . . . . . . . . .  7
     2.2.  Alternative Service Caching  . . . . . . . . . . . . . . .  7
     2.3.  Requiring Server Name Indication . . . . . . . . . . . . .  8
     2.4.  Using Alternative Services . . . . . . . . . . . . . . . .  8
   3.  The Alt-Svc HTTP Header Field  . . . . . . . . . . . . . . . .  9
     3.1.  Caching Alt-Svc Header Field Values  . . . . . . . . . . . 11
   4.  The ALTSVC HTTP/2 Frame  . . . . . . . . . . . . . . . . . . . 12
   5.  The Alt-Used HTTP Header Field . . . . . . . . . . . . . . . . 14
   6.  The 421 Misdirected Request HTTP Status Code . . . . . . . . . 14
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 15
     7.1.  Header Field Registrations . . . . . . . . . . . . . . . . 15
     7.2.  The ALTSVC HTTP/2 Frame Type . . . . . . . . . . . . . . . 15
     7.3.  Alt-Svc Parameter Registry . . . . . . . . . . . . . . . . 15
       7.3.1.  Procedure  . . . . . . . . . . . . . . . . . . . . . . 15
       7.3.2.  Registrations  . . . . . . . . . . . . . . . . . . . . 16
   8.  Internationalization Considerations  . . . . . . . . . . . . . 16
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16
     9.1.  Changing Ports . . . . . . . . . . . . . . . . . . . . . . 16
     9.2.  Changing Hosts . . . . . . . . . . . . . . . . . . . . . . 17
     9.3.  Changing Protocols . . . . . . . . . . . . . . . . . . . . 17
     9.4.  Tracking Clients Using Alternative Services  . . . . . . . 18
     9.5.  Confusion Regarding Request Scheme . . . . . . . . . . . . 18
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 19