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RE: [EXTERNAL] Re: ALPN negotiation (was Re: Add extension work to Interop matrix)

Andrei Popov <Andrei.Popov@microsoft.com> Tue, 07 January 2020 19:49 UTC

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From: Andrei Popov <Andrei.Popov@microsoft.com>
To: Dmitri Tikhonov <dtikhonov@litespeedtech.com>, Christian Huitema <huitema@huitema.net>
CC: IETF QUIC WG <quic@ietf.org>
Subject: RE: [EXTERNAL] Re: ALPN negotiation (was Re: Add extension work to Interop matrix)
Thread-Topic: [EXTERNAL] Re: ALPN negotiation (was Re: Add extension work to Interop matrix)
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Date: Tue, 07 Jan 2020 19:49:52 +0000
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>     1. Client sends (h3-X, h3-Y), server responds with h3-X; and
>     2. Client sends (h3-Y, h3-X), server responds with h3-Y?

Not necessarily. The server will likely choose an ALPN ID based on the server's application protocol preferences, rather than the client's.

Cheers,

Andrei

-----Original Message-----
From: QUIC <quic-bounces@ietf.org> On Behalf Of Dmitri Tikhonov
Sent: Tuesday, January 7, 2020 11:46 AM
To: Christian Huitema <huitema@huitema.net>
Cc: IETF QUIC WG <quic@ietf.org>
Subject: [EXTERNAL] Re: ALPN negotiation (was Re: Add extension work to Interop matrix)

On Tue, Jan 07, 2020 at 09:06:49AM -1000, Christian Huitema wrote:
> It seems that ALPN negotiation is going to be a practical requirement 
> going forward. Not so much for negotiating H09 versus H3, we can 
> expect
> H09 to fade away at some point. But we will have to negotiate h3-24 vs
> h3-25 and similar transitions for a good bit of time, and then we will 
> probably move to h4-00, h4-01, etc. So maybe we should start testing that.

I would be for it.  Is the testing as simple as

    1. Client sends (h3-X, h3-Y), server responds with h3-X; and
    2. Client sends (h3-Y, h3-X), server responds with h3-Y?

Of course, this assumes that the server support both h3-X and h3-Y.
For example, supporting drafts 23 and 24 at the same time was easy;
24 and 25 might not be as easy.

  - Dmitri.

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