Re: [Ietf-message-headers] [art] X-Face, Face and X-Image-URL header fields

worley@ariadne.com (Dale R. Worley) Mon, 26 September 2016 14:48 UTC

Return-Path: <worley@alum.mit.edu>
X-Original-To: ietf-message-headers@ietfa.amsl.com
Delivered-To: ietf-message-headers@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A83412B22F for <ietf-message-headers@ietfa.amsl.com>; Mon, 26 Sep 2016 07:48:17 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.934
X-Spam-Level:
X-Spam-Status: No, score=-1.934 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_SOFTFAIL=0.665] autolearn=no 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 R1XyaF0Bn04o for <ietf-message-headers@ietfa.amsl.com>; Mon, 26 Sep 2016 07:48:14 -0700 (PDT)
Received: from resqmta-po-12v.sys.comcast.net (resqmta-po-12v.sys.comcast.net [IPv6:2001:558:fe16:19:96:114:154:171]) (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 C946312B21E for <ietf-message-headers@ietf.org>; Mon, 26 Sep 2016 07:48:12 -0700 (PDT)
Received: from resomta-po-03v.sys.comcast.net ([96.114.154.227]) by resqmta-po-12v.sys.comcast.net with SMTP id oXCEbrWiylHMYoXCWbn7Ag; Mon, 26 Sep 2016 14:48:12 +0000
Received: from hobgoblin.ariadne.com ([73.100.16.189]) by resomta-po-03v.sys.comcast.net with SMTP id oXCUb3MsNDbf9oXCVbMy9p; Mon, 26 Sep 2016 14:48:12 +0000
Received: from hobgoblin.ariadne.com (hobgoblin.ariadne.com [127.0.0.1]) by hobgoblin.ariadne.com (8.14.7/8.14.7) with ESMTP id u8QEmAAl000383; Mon, 26 Sep 2016 10:48:10 -0400
Received: (from worley@localhost) by hobgoblin.ariadne.com (8.14.7/8.14.7/Submit) id u8QEm91k000380; Mon, 26 Sep 2016 10:48:09 -0400
X-Authentication-Warning: hobgoblin.ariadne.com: worley set sender to worley@alum.mit.edu using -f
From: worley@ariadne.com (Dale R. Worley)
To: Julien =?utf-8?Q?=C3=89LIE?= <julien@trigofacile.com>
In-Reply-To: <ffda4318-9916-23f7-3371-2cdc7e1f4584@trigofacile.com> (julien@trigofacile.com)
Sender: worley@ariadne.com (Dale R. Worley)
Date: Mon, 26 Sep 2016 10:48:09 -0400
Message-ID: <871t0690pi.fsf@hobgoblin.ariadne.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
X-CMAE-Envelope: MS4wfK+cG9F7UYTwIecgfS4QQVLct77r4NdQpgTZVryEq/Se2V8SvkHogEhCRdvSa9ov/CryNgTh7A0CjcrjNzxt0IY7epwLmpMs+so0sV8P9yrZH/FtYYYi vNduefAuCzJyThld9V2Etq7oX1aw16viia4CPF1fIealwTAUs5dYTD+LgTbmwPcyCtgP9TE74UcAVYLiaiqytNvpAtz4lYAjoMTSB99o84N/x9S7XKAgT4ha 0ZqWtceSZzxeOXT6iz+brA==
Archived-At: <https://mailarchive.ietf.org/arch/msg/ietf-message-headers/hL5eZOMprTosVZGcX1c0-KOIC9w>
Cc: art@ietf.org, ietf-message-headers@ietf.org
Subject: Re: [Ietf-message-headers] [art] X-Face, Face and X-Image-URL header fields
X-BeenThere: ietf-message-headers@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: "Discussion list for header fields used in Internet messaging applications." <ietf-message-headers.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ietf-message-headers>, <mailto:ietf-message-headers-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ietf-message-headers/>
List-Post: <mailto:ietf-message-headers@ietf.org>
List-Help: <mailto:ietf-message-headers-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ietf-message-headers>, <mailto:ietf-message-headers-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 26 Sep 2016 14:48:17 -0000

Julien ÉLIE <julien@trigofacile.com> writes:
> Couldn't the Message Headers IANA registry at 
> <http://www.iana.org/assignments/message-headers/message-headers.xhtml> 
> reference the following three header fields used in mail and news messages?
>
> * X-Face for a black & white image
> * Face for a coloured image
> * X-Image-URL for a link to an image

I doubt there has been any attempt to specify them.  Certainly the ones
starting with "X-" were considered experimental by whoever invented
them.

If I read the IANA page correctly, the registration procedures for
headers are specified in RFC 3864, section 4.

Dale