The ALPN HTTP Header Field
draft-ietf-httpbis-tunnel-protocol-04

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Document Type Active Internet-Draft (httpbis WG)
Authors Andrew Hutton  , Justin Uberti  , Martin Thomson 
Last updated 2015-06-11 (latest revision 2015-05-20)
Replaces draft-hutton-httpbis-connect-protocol
Stream IETF
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HTTP Working Group                                             A. Hutton
Internet-Draft                                                     Unify
Intended status: Standards Track                               J. Uberti
Expires: November 21, 2015                                        Google
                                                              M. Thomson
                                                                 Mozilla
                                                            May 20, 2015

                       The ALPN HTTP Header Field
                 draft-ietf-httpbis-tunnel-protocol-04

Abstract

   This specification allows HTTP CONNECT requests to indicate what
   protocol will be used within the tunnel once established, using the
   ALPN header field.

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
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

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   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 November 21, 2015.

Copyright Notice

   Copyright (c) 2015 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
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   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  The ALPN HTTP Header Field  . . . . . . . . . . . . . . . . .   3
     2.1.  Header Field Values . . . . . . . . . . . . . . . . . . .   3
     2.2.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Usage . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   6
     5.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The HTTP CONNECT method (Section 4.3.6 of [RFC7231]) requests that
   the recipient establish a tunnel to the identified origin server and
   thereafter forward packets, in both directions, until the tunnel is
   closed.  Such tunnels are commonly used to create end-to-end virtual
   connections, through one or more proxies.

   The HTTP ALPN header field identifies the protocol that will be used
   within the tunnel, using the Application Layer Protocol Negotiation
   identifier (ALPN, [RFC7301]).

   When the CONNECT method is used to establish a tunnel, the ALPN
   header field can be used to identify the protocol that the client
   intends to use with that tunnel.  For a tunnel that is then secured
   using TLS [RFC5246], the header field carries the same application
   protocol label as will be carried within the TLS handshake.  If there
   are multiple possible application protocols, all of those application
   protocols are indicated.

   The ALPN header field carries an indication of client intent only.
   An ALPN identifier is used here only to identify the application
   protocol or suite of protocols that the client intends to use in the
   tunnel.  No negotiation takes place using this header field.  In TLS,
   the final choice of application protocol is made by the server from
   the set of choices presented by the client.  Other substrates could
   negotiate the application protocol differently.

   Proxies do not implement the tunneled protocol, though they might
   choose to make policy decisions based on the value of the header

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