Re: [apps-discuss] Last Call: <draft-ietf-appsawg-http-forwarded-06.txt> (Forwarded HTTP Extension) to Proposed Standard

SM <sm@resistor.net> Thu, 12 July 2012 00:08 UTC

Return-Path: <sm@resistor.net>
X-Original-To: ietf@ietfa.amsl.com
Delivered-To: ietf@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6DE3311E8126; Wed, 11 Jul 2012 17:08:37 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -102.565
X-Spam-Level:
X-Spam-Status: No, score=-102.565 tagged_above=-999 required=5 tests=[AWL=0.034, BAYES_00=-2.599, USER_IN_WHITELIST=-100]
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 NMfCPE4hZM6f; Wed, 11 Jul 2012 17:08:33 -0700 (PDT)
Received: from mx.ipv6.elandsys.com (mx.ipv6.elandsys.com [IPv6:2001:470:f329:1::1]) by ietfa.amsl.com (Postfix) with ESMTP id 0574211E80C6; Wed, 11 Jul 2012 17:08:32 -0700 (PDT)
Received: from SUBMAN.resistor.net (IDENT:sm@localhost [127.0.0.1]) (authenticated bits=0) by mx.elandsys.com (8.14.5/8.14.5) with ESMTP id q6C08uE6014693; Wed, 11 Jul 2012 17:09:00 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=opendkim.org; s=mail2010; t=1342051743; bh=8w6mO/YQXx3NYsLSfj//f0S5H46KAMSfu2Mq5v3xCno=; h=Date:To:From:Subject:Cc:In-Reply-To:References; b=pwycZV4ND2GWWVnF8oA0NLrwFb82XuZxk8V8y94fuBwxfyqtsXbOx639mZw7HDWq2 K+TVSL0AUWfW4VkfNQ9+ful+H8UYZrIDKtgzzUfGfXsaJGvimEYksLeHo4E8bqDTf3 HoiOiNZWqyePiXHltTidKgzUWiS3NtmdoHmTV0HI=
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=resistor.net; s=mail; t=1342051743; i=@resistor.net; bh=8w6mO/YQXx3NYsLSfj//f0S5H46KAMSfu2Mq5v3xCno=; h=Date:To:From:Subject:Cc:In-Reply-To:References; b=uZLyimhvx1eGhBHzzjLnPfgnsximRhfXir6pX3K4vQHLfxeLDu7gVsMRJXQvcPUBA qrBYIQtWwC+2ONfq44r66yQ8O63E4tzTzv+cnMl6DN7ec5ZjQg/+s5f3DSxNf1eLnN aLSyedRHmU2zYuSrRkLz5OLiDFYtPOA+DJFsBITE=
Message-Id: <6.2.5.6.2.20120711154825.09f09be8@resistor.net>
X-Mailer: QUALCOMM Windows Eudora Version 6.2.5.6
Date: Wed, 11 Jul 2012 16:48:19 -0700
To: Andreas Petersson <andreas@sbin.se>
From: SM <sm@resistor.net>
Subject: Re: [apps-discuss] Last Call: <draft-ietf-appsawg-http-forwarded-06.txt> (Forwarded HTTP Extension) to Proposed Standard
In-Reply-To: <20120711154158.60f6ecf0@hetzer>
References: <20120709162848.23418.51856.idtracker@ietfa.amsl.com> <22B6DCC8-3BBF-4C64-876E-13ABFBE6CB2F@cdt.org> <6.2.5.6.2.20120709134136.0ad9ae18@resistor.net> <20120710132825.5141babe@hetzer> <6.2.5.6.2.20120710081323.08c9bcf8@resistor.net> <20120711154158.60f6ecf0@hetzer>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format="flowed"
Cc: IETF Discussion Mailing List <ietf@ietf.org>, apps-discuss@ietf.org
X-BeenThere: ietf@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: IETF-Discussion <ietf.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ietf>, <mailto:ietf-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/ietf>
List-Post: <mailto:ietf@ietf.org>
List-Help: <mailto:ietf-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ietf>, <mailto:ietf-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 12 Jul 2012 00:08:37 -0000

Hi Andreas,
At 06:41 11-07-2012, Andreas Petersson wrote:
>How is it "random bits of information" when the specifications says
>that it MUST be underscore?
>
>As far as I can think of, the only thing that it will tell is that the
>implementation is following this specification.
>So, on the contrary; the more "degrees of freedom" that is given to the
>implementation, the easier it would be to do fingerprinting.

I could use a hash.  If the hash has to begin with an underscore, I 
have to reserve storage space for it.  The ease for fingerprinting 
depends on how Section 6.3 is implemented (see reference I posted on 
WG mailing list about browser identification).  I am ok if you want 
to keep the requirement.

Regards,
-sm