Re: Last Call: <draft-ietf-httpbis-header-structure-18.txt> (Structured Field Values for HTTP) to Proposed Standard

Poul-Henning Kamp <phk@phk.freebsd.dk> Fri, 15 May 2020 16:09 UTC

Return-Path: <ietf-http-wg-request+bounce-httpbisa-archive-bis2juki=lists.ie@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 9744F3A0C26 for <ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com>; Fri, 15 May 2020 09:09:44 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.648
X-Spam-Level:
X-Spam-Status: No, score=-2.648 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, MAILING_LIST_MULTI=-1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3KhIzsorqVQC for <ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com>; Fri, 15 May 2020 09:09:42 -0700 (PDT)
Received: from lyra.w3.org (lyra.w3.org [128.30.52.18]) (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 C2E863A0C29 for <httpbisa-archive-bis2Juki@lists.ietf.org>; Fri, 15 May 2020 09:09:33 -0700 (PDT)
Received: from lists by lyra.w3.org with local (Exim 4.92) (envelope-from <ietf-http-wg-request@listhub.w3.org>) id 1jZcrR-00050M-Dg for ietf-http-wg-dist@listhub.w3.org; Fri, 15 May 2020 16:06:57 +0000
Resent-Date: Fri, 15 May 2020 16:06:57 +0000
Resent-Message-Id: <E1jZcrR-00050M-Dg@lyra.w3.org>
Received: from mimas.w3.org ([128.30.52.79]) by lyra.w3.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <phk@critter.freebsd.dk>) id 1jZcrQ-0004z7-09 for ietf-http-wg@listhub.w3.org; Fri, 15 May 2020 16:06:56 +0000
Received: from phk.freebsd.dk ([130.225.244.222]) by mimas.w3.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <phk@critter.freebsd.dk>) id 1jZcrN-0003MK-P4 for ietf-http-wg@w3.org; Fri, 15 May 2020 16:06:55 +0000
Received: from critter.freebsd.dk (v-critter.freebsd.dk [192.168.55.3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by phk.freebsd.dk (Postfix) with ESMTPS id 46ADB1AF18C; Fri, 15 May 2020 16:06:40 +0000 (UTC)
Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.15.2/8.15.2) with ESMTPS id 04FG6d12044487 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Fri, 15 May 2020 16:06:40 GMT (envelope-from phk@critter.freebsd.dk)
Received: (from phk@localhost) by critter.freebsd.dk (8.15.2/8.15.2/Submit) id 04FG6bfL044486; Fri, 15 May 2020 16:06:37 GMT (envelope-from phk)
To: Julian Reschke <julian.reschke@gmx.de>, mnot@mnot.net, phk@varnish-cache.org
cc: Willy Tarreau <w@1wt.eu>, last-call@ietf.org, httpbis-chairs@ietf.org, ietf-http-wg@w3.org, barryleiba@gmail.com, draft-ietf-httpbis-header-structure@ietf.org
In-reply-to: <4859a11f-5649-b633-f43b-facf036e61c7@gmx.de>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
References: <158740521959.1174.9556681562748997101@ietfa.amsl.com> <bb3a29ff-1a0f-964d-c764-4d4819d338da@gmx.de> <4184EA3A-793F-4F29-8E99-FD371F35F6AC@mnot.net> <0150efc3-9d69-3ada-b714-5d2d6c9dbed3@gmx.de> <20200515151336.GB8412@1wt.eu> <4859a11f-5649-b633-f43b-facf036e61c7@gmx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <44484.1589558797.1@critter.freebsd.dk>
Content-Transfer-Encoding: quoted-printable
Date: Fri, 15 May 2020 16:06:37 +0000
Message-ID: <44485.1589558797@critter.freebsd.dk>
Received-SPF: pass client-ip=130.225.244.222; envelope-from=phk@critter.freebsd.dk; helo=phk.freebsd.dk
X-W3C-Hub-Spam-Status: No, score=-4.9
X-W3C-Hub-Spam-Report: BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, W3C_AA=-1, W3C_IRA=-1, W3C_WL=-1
X-W3C-Scan-Sig: mimas.w3.org 1jZcrN-0003MK-P4 eb961e54ec34443447d3ea1df819073e
X-Original-To: ietf-http-wg@w3.org
Subject: Re: Last Call: <draft-ietf-httpbis-header-structure-18.txt> (Structured Field Values for HTTP) to Proposed Standard
Archived-At: <https://www.w3.org/mid/44485.1589558797@critter.freebsd.dk>
Resent-From: ietf-http-wg@w3.org
X-Mailing-List: <ietf-http-wg@w3.org> archive/latest/37632
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: <https://www.w3.org/Mail/>
List-Post: <mailto:ietf-http-wg@w3.org>
List-Unsubscribe: <mailto:ietf-http-wg-request@w3.org?subject=unsubscribe>

--------
In message <4859a11f-5649-b633-f43b-facf036e61c7@gmx.de>de>, Julian Reschke writes
:

>Related to this: it just occurred to me that:
>
>   Test: Foo
>   Test:
>   Test: Bar
>
>yields different results for fields using HTTP's list notation, and
>structured header fields.
>
>In the former case, the combined value is equivalent to
>
>   Test: Foo, Bar
>
>while in the latter case, the field is malformed.
>
>I *really* think it would be better if structured header fields would
>actually be "proper" applications of the standard HTTP list ABNF.

Considering how rarely used multiple-headers are (apart from The
Cookie Mistake) I think it would be much simpler, better and wiser
to restrict SH to single, non-concatenated headers.

Ufortunately, that also runs up against the fact that we cannot
possibly know if the header we got was joined by an unwitting
intermediary.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.