[Doh] Support requirements for Head

Stephane Bortzmeyer <bortzmeyer@nic.fr> Sun, 18 March 2018 13:13 UTC

Return-Path: <bortzmeyer@nic.fr>
X-Original-To: doh@ietfa.amsl.com
Delivered-To: doh@ietfa.amsl.com
Received: from localhost (localhost []) by ietfa.amsl.com (Postfix) with ESMTP id A05D812D0C3 for <doh@ietfa.amsl.com>; Sun, 18 Mar 2018 06:13:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([]) by localhost (ietfa.amsl.com []) (amavisd-new, port 10024) with ESMTP id fUSSGMMeQnbn for <doh@ietfa.amsl.com>; Sun, 18 Mar 2018 06:13:22 -0700 (PDT)
Received: from ayla.bortzmeyer.org (ayla.bortzmeyer.org [IPv6:2001:4b98:dc0:41:216:3eff:fe27:3d3f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AECAF1204DA for <doh@ietf.org>; Sun, 18 Mar 2018 06:13:22 -0700 (PDT)
Received: by ayla.bortzmeyer.org (Postfix, from userid 10) id E55FCA05CF; Sun, 18 Mar 2018 14:13:18 +0100 (CET)
Received: by godin (Postfix, from userid 1000) id 9C36DEC0B87; Sun, 18 Mar 2018 14:11:39 +0100 (CET)
Date: Sun, 18 Mar 2018 13:11:39 +0000
From: Stephane Bortzmeyer <bortzmeyer@nic.fr>
To: =?utf-8?Q?=C3=93lafur_Gu=C3=B0mundsson?= <olafur@cloudflare.com>
Cc: doh@ietf.org
Message-ID: <20180318131139.GA1127@laperouse.bortzmeyer.org>
References: <CAN6NTqzkUeF79y=heQ7PK7T3mQVDDk5WRtqB-npi6PuQ2s5bNQ@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CAN6NTqzkUeF79y=heQ7PK7T3mQVDDk5WRtqB-npi6PuQ2s5bNQ@mail.gmail.com>
X-Transport: UUCP rules
X-Operating-System: Ubuntu 16.04 (xenial)
X-Charlie: Je suis Charlie
User-Agent: Mutt/1.5.24 (2015-08-30)
Archived-At: <https://mailarchive.ietf.org/arch/msg/doh/Bz58swX90wWxaa7YM1zcKZmY_Uo>
Subject: [Doh] Support requirements for Head
X-BeenThere: doh@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: DNS Over HTTPS <doh.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/doh>, <mailto:doh-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/doh/>
List-Post: <mailto:doh@ietf.org>
List-Help: <mailto:doh-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/doh>, <mailto:doh-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 18 Mar 2018 13:13:25 -0000

On Sat, Mar 17, 2018 at 12:27:09PM +0000,
 Ólafur Guðmundsson <olafur@cloudflare.com> wrote 
 a message of 56 lines which said:

> Based on experience at the IETF101 Hackathon this issue came up.

A related issue is HEAD support. Today, one implementation rejects
both GET and HEAD (405), one accepts GET but HEAD triggers a 400
(probably a bug, reported).

My personal opinion is "if you support GET, you MUST support
HEAD". Any HTTP advice? (Technically, it's nothing, the vast majority
of DoH clients and servers already handle HEAD.)