Re: ETag specification: load balance friendly and merge with Digest header from

Julian Reschke <julian.reschke@gmx.de> Mon, 20 July 2020 13:25 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 2BCBD3A0809 for <ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com>; Mon, 20 Jul 2020 06:25:42 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.921
X-Spam-Level:
X-Spam-Status: No, score=-2.921 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.001, MAILING_LIST_MULTI=-1, NICE_REPLY_A=-0.001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=gmx.net
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 f-HfErSANSCB for <ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com>; Mon, 20 Jul 2020 06:25:40 -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 943E83A0808 for <httpbisa-archive-bis2Juki@lists.ietf.org>; Mon, 20 Jul 2020 06:25:40 -0700 (PDT)
Received: from lists by lyra.w3.org with local (Exim 4.92) (envelope-from <ietf-http-wg-request@listhub.w3.org>) id 1jxVkm-0004eA-Av for ietf-http-wg-dist@listhub.w3.org; Mon, 20 Jul 2020 13:22:48 +0000
Resent-Date: Mon, 20 Jul 2020 13:22:48 +0000
Resent-Message-Id: <E1jxVkm-0004eA-Av@lyra.w3.org>
Received: from titan.w3.org ([128.30.52.76]) by lyra.w3.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <julian.reschke@gmx.de>) id 1jxVkk-0004dP-Vk for ietf-http-wg@listhub.w3.org; Mon, 20 Jul 2020 13:22:47 +0000
Received: from mout.gmx.net ([212.227.15.19]) by titan.w3.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <julian.reschke@gmx.de>) id 1jxVkj-00038R-64 for ietf-http-wg@w3.org; Mon, 20 Jul 2020 13:22:46 +0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1595251352; bh=nSlOjsuauhB5fN714RBDEkpuEJJjOrGh0OEQBpA67OY=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=J4eoKRbOSA8dzB0W8WMhqENFer/FoCnKEturdE7QYMqmJFIM47rzNE4fbCPLNtV2Z dxxKcht7S1Pa75yDItMDYjT/3SKGzol263ikW3YWhnxa3tPPY8B2NkuZ9L02MtBZy7 YILivI2QffGpzpIgtDpIwsOz0aThZbDx+1dPPdxc=
X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c
Received: from [192.168.1.236] ([5.10.171.186]) by mail.gmx.com (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MMGN2-1kEdCA0x9i-00JGlN; Mon, 20 Jul 2020 15:22:32 +0200
To: Sergey Ponomarev <stokito@gmail.com>, Roberto Polli <robipolli@gmail.com>
Cc: HTTP Working Group <ietf-http-wg@w3.org>
References: <CADR0UcXFgHrg9Q59AqN0D-PaZuVp96LPhGaQSo3a9cg+zFpU1w@mail.gmail.com> <CAP9qbHX4ety3zZBYFZb5dvWinpP-z=L0sp0hzDofjLFe_=qmdw@mail.gmail.com> <CADR0UcX6mJiYMUm7OU46_ihtqyS+94Y+v4L-sTyJRDvX4HbRBg@mail.gmail.com>
From: Julian Reschke <julian.reschke@gmx.de>
Message-ID: <0bbfe059-b2fa-4dcd-4deb-9bb3ef1dfe1b@gmx.de>
Date: Mon, 20 Jul 2020 15:22:30 +0200
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0
MIME-Version: 1.0
In-Reply-To: <CADR0UcX6mJiYMUm7OU46_ihtqyS+94Y+v4L-sTyJRDvX4HbRBg@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: quoted-printable
X-Provags-ID: V03:K1:1F/hNlTqkJElAdX2Y+l+QRDwrZTTOkhjCReY2/dLE1FJCavqwdp MqZQFexxP6mTAGEccNAwVvgJRjQGp2/j6LEWab6utEezh3UH6/BSV56KiYENktg9S3qo9Sx M0vAQ5fZT1FSgtrISrP8cVUxd/SMcX1gAPgnU3Tl8U3303xDTIiq6bpR57/qXNdfbbYRukK 51doFtINvUaybiaO+WBgQ==
X-UI-Out-Filterresults: notjunk:1;V03:K0:LodQknFjQ2Y=:ylgNSJ/qCoD+LYC4i5++Ky EHligbywWOGA022BBZ6Jyv11kSvt5Ow9oLT22FEDEiFXQ5zLdV52zw4icyE7RgwQ9Oi58edqS wa+JgsWoz9/ITYX0qACLGfrBzmfkxXRGCRFVx1dAIvJ76cVHs4OdbpgrzBZdyzSoNPOSjLQmA P40mOKiUGMr92eC4dVxOz6yDI5qnDvG3LnviOhAL63YNp4W9/XrR1kcyRDrZIdUmSqR5BwZ8o OFq46UY0SxVu4JRMbSr+F2053DaRuiQ8xrtiCIWOs0OgU03WArhTikTtWUnS4dXDXhNH2GPgP Pr9fHKS7PERc1crqr7ak/UOga+Qzz+d5RgDwtyajYyZ7WJhB27mmVzq3wNnwk/CH1HmGBASEa D/Kodhe4BLR2zSb8wiTrLuOaINrY3PPWtbgPL7YpE417sjLCgAnXkTqAjpcMrZA7NwPrOSdSL 8WFNlupha1/lkVgrfnyM60hzOGB4L8njr4h9u3xHjs/S8V3ukiXGTAshJa6rmfg9Ne+bky7aI BwLsGs7Kn7+Pg+/1qR6pL2K5mwK+FKBgLfgBoX0ZrNVNo9NDw5jtJBYwc4ZBowWgu5/bPJKKg kPy+h2ShGGIWBR0b7jGRI931z4Dm4aeUyO2xZyzWZ/LFZkNk2fgnyikG1Qb2ZsS9oQe9j0rjc LKHFFKsHR6ewEzkz8bA5tmMOfXE1ro1F5a7t2AyxALX2KTi0cn0YUi+6GRoEKDXHP2rks01yJ Criv8VwcYJ8ENSIgDB/rOX25uwf7Tzv51zSDtK9u/WPuVTOWebRmDZBbp3RNZEbrA8Aqkjbtc tGzxtKkQ7i7jz+Lu02mbFu0nE/E9S8OYloI2KmIvxl8ULaRXTnVZbZQtUNhlQW6v4dHwQb42q 1LK5jGI0uogshVRzoR9OhM2s1sAwUEINTo6YgbjemEy49++DKP0GjZjFZmCXNSIT1dEcFXtgC DIbrXixg/jQjE0FrL+v3qVycooMOL9bDlg1UyJ7sL4OeMEOBf4X602UNu7G1WVYHk4vd4kS+w NB8wFLZ/RZ6/stp15fqDuNBaXMVewO0R+lpGvOAnbB89WQSpXcAju1sIngDHY3xmGTul1bifP 5V18TArkUeUPuQZNtSDb5/JN5KEWFqRmOAnoceXghwwI2Cr0WFKtUSS4IKy4aIMi+VSfcbvcC FEQm46FWEy5tr0T8XvKfm3rE2niVL/RgIqVsn5MciZox0GXYTMIT6ehliSXKEBjc1h76w+qU1 LoQE7c9Sb4StGHyudFkf9CgNE1Mpc7M6ZFBapxw==
Received-SPF: pass client-ip=212.227.15.19; envelope-from=julian.reschke@gmx.de; helo=mout.gmx.net
X-W3C-Hub-Spam-Status: No, score=-6.0
X-W3C-Hub-Spam-Report: BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FROM=0.001, NICE_REPLY_A=-0.353, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, W3C_AA=-1, W3C_IRA=-1, W3C_WL=-1
X-W3C-Scan-Sig: titan.w3.org 1jxVkj-00038R-64 afa3abb50d5855df78f43268b7377b6d
X-Original-To: ietf-http-wg@w3.org
Subject: Re: ETag specification: load balance friendly and merge with Digest header from
Archived-At: <https://www.w3.org/mid/0bbfe059-b2fa-4dcd-4deb-9bb3ef1dfe1b@gmx.de>
Resent-From: ietf-http-wg@w3.org
X-Mailing-List: <ietf-http-wg@w3.org> archive/latest/37891
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>

On 16.07.2020 21:48, Sergey Ponomarev wrote:
> Hi Roberto,
>
> Thank you for the explanation now it clear. ETag header allows multiple
> tags so it seems like we can pass both weak ETag and digest in the same
> header. Thus we can simplify cases and avoid duplication  when Digest is
> the same as hash based  ETag.
> ...

Hm, no. You can't have multiple Etags in a single "Etag" response header
field.

Best regards, Julian