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Re: issue 381: Discovery of the support of the HTTP2 protocol: DNS-based Upgrade

From: Eliot Lear <lear@cisco.com>
Date: Thu, 20 Feb 2014 18:48:02 +0100
Message-ID: <53063FD2.4040002@cisco.com>
To: Martin Thomson <martin.thomson@gmail.com>
CC: Mark Nottingham <mnot@mnot.net>, IETF HTTP WG <ietf-http-wg@w3.org>

On 2/20/14, 6:21 PM, Martin Thomson wrote:
> On 20 February 2014 08:26, Eliot Lear <lear@cisco.com> wrote:

> I don't know what you mean by "fast restart" here, but looking at some
> of the proposed TLS 1.3 cases for fast handshakes, and session
> resumption, you end up in a state where the choice from the last
> session is maintained by default.  A client can of course opt to use
> the longer handshake form in an attempt to move to another selection;
> similarly the server can reject the resumption/fast handshake and fall
> back to a complete negotiation.
>
> There's a risk there that any choice becomes excessively "sticky" over
> time, by which I mean that a choice to use "h2" could persist longer
> than would otherwise be ideal.  I'm inclined to rely on operational
> guidance (deploy "h3", reject resumptions or shortened handshakes from
> prior to when the deployment occurred) rather than build additional
> protocol machinery.  After all, that same guidance is going to be
> necessary for cipher suite selection and other things as well.

Thanks, Martin.  This captured and addressed my concern.

Eliot
>
Received on Thursday, 20 February 2014 17:48:31 UTC

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