p1: Upgrade ordering (possible HTTP/2 impact)

Mark Nottingham <mnot@mnot.net> Sat, 20 April 2013 04:41 UTC

Return-Path: <ietf-http-wg-request@listhub.w3.org>
X-Original-To: ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com
Delivered-To: ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C788921F8ECA for <ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com>; Fri, 19 Apr 2013 21:41:10 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -10.469
X-Spam-Level:
X-Spam-Status: No, score=-10.469 tagged_above=-999 required=5 tests=[AWL=0.130, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QA7SAYgeznDJ for <ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com>; Fri, 19 Apr 2013 21:41:10 -0700 (PDT)
Received: from frink.w3.org (frink.w3.org [128.30.52.56]) by ietfa.amsl.com (Postfix) with ESMTP id BB91821F8EC6 for <httpbisa-archive-bis2Juki@lists.ietf.org>; Fri, 19 Apr 2013 21:41:09 -0700 (PDT)
Received: from lists by frink.w3.org with local (Exim 4.72) (envelope-from <ietf-http-wg-request@listhub.w3.org>) id 1UTP66-0005KH-Nc for ietf-http-wg-dist@listhub.w3.org; Sat, 20 Apr 2013 04:08:22 +0000
Resent-Date: Sat, 20 Apr 2013 04:08:22 +0000
Resent-Message-Id: <E1UTP66-0005KH-Nc@frink.w3.org>
Received: from lisa.w3.org ([128.30.52.41]) by frink.w3.org with esmtp (Exim 4.72) (envelope-from <mnot@mnot.net>) id 1UTP63-0005Fv-OP for ietf-http-wg@listhub.w3.org; Sat, 20 Apr 2013 04:08:19 +0000
Received: from mxout-08.mxes.net ([216.86.168.183]) by lisa.w3.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.72) (envelope-from <mnot@mnot.net>) id 1UTP63-000135-3r for ietf-http-wg@w3.org; Sat, 20 Apr 2013 04:08:19 +0000
Received: from mnot-mini.mnot.net (unknown [118.209.190.66]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id BA05B509B8 for <ietf-http-wg@w3.org>; Sat, 20 Apr 2013 00:07:57 -0400 (EDT)
From: Mark Nottingham <mnot@mnot.net>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Message-Id: <B49447FF-CB94-43ED-9CA2-0698C64BB554@mnot.net>
Date: Sat, 20 Apr 2013 14:07:57 +1000
To: "ietf-http-wg@w3.org Group" <ietf-http-wg@w3.org>
Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\))
X-Mailer: Apple Mail (2.1503)
Received-SPF: pass client-ip=216.86.168.183; envelope-from=mnot@mnot.net; helo=mxout-08.mxes.net
X-W3C-Hub-Spam-Status: No, score=-3.3
X-W3C-Hub-Spam-Report: AWL=-3.335, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001
X-W3C-Scan-Sig: lisa.w3.org 1UTP63-000135-3r a9906759d3b504dbed31b7e09620a66a
X-Original-To: ietf-http-wg@w3.org
Subject: p1: Upgrade ordering (possible HTTP/2 impact)
Archived-At: <http://www.w3.org/mid/B49447FF-CB94-43ED-9CA2-0698C64BB554@mnot.net>
Resent-From: ietf-http-wg@w3.org
X-Mailing-List: <ietf-http-wg@w3.org> archive/latest/17377
X-Loop: ietf-http-wg@w3.org
Resent-Sender: ietf-http-wg-request@w3.org
Precedence: list
List-Id: <ietf-http-wg.w3.org>
List-Help: <http://www.w3.org/Mail/>
List-Post: <mailto:ietf-http-wg@w3.org>
List-Unsubscribe: <mailto:ietf-http-wg-request@w3.org?subject=unsubscribe>

p1 section 6.7 defines the Upgrade header, but no where does it say anything about relative preference.

Should we define (or at least allow) for the ordering to be semantically significant? It seems to me that if we end up using this, and there are a few different variants of HTTP/2 (e.g., "normal" vs "mobile"), it'd be nice to rely on ordering here.

Cheers,

--
Mark Nottingham   http://www.mnot.net/