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Re: ALPN negotiation (was Re: Add extension work to Interop matrix)

Christian Huitema <huitema@huitema.net> Wed, 08 January 2020 07:20 UTC

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To: Lucas Pardue <lucaspardue.24.7@gmail.com>, IETF QUIC WG <quic@ietf.org>
References: <20200107143114.GC14229@ubuntu-dmitri> <d27fc30c-7f51-85f3-4bb1-e7b7b500ac72@huitema.net> <20200107194543.GK14229@ubuntu-dmitri> <CALGR9oboJhewv4tdF9G_WZsxZ4gO2ZQ-H6teFSgr3+-WSrds4A@mail.gmail.com>
From: Christian Huitema <huitema@huitema.net>
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Subject: Re: ALPN negotiation (was Re: Add extension work to Interop matrix)
Message-ID: <0199d52e-22c8-0297-1daf-0e2d58bb7146@huitema.net>
Date: Tue, 07 Jan 2020 21:20:10 -1000
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On 1/7/2020 9:51 AM, Lucas Pardue wrote:
> Probably a good idea. 
>
> IIUC I think you could solve the multi- version problem by creating
> two (or more) aliases for each version of the same protocol. This
> means testing of ALPN ordering but implementations don't need to
> support protocol level changes.
>
> The upshot is that this could also be used for Alt-Svc testing. 
>
> Lucas

The aliasing part is interesting, but it requires some WG conventions,
e.g. stating that "hq-24" and "a24-hq" are equivalent. We would have to
agree on the convention as part of interop testing. Also, if the list
proposed by the client is "a24-hq, hq-24", how do you define success?
Negotiating the first value in the list? Negotiating any of the values
in the list?

Related thought: is there an ALPN range reserved for greasing?

-- Christian Huitema

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