Re: New draft: HTTP Version Translation of the Capsule Protocol

That solution works for me, thanks Kazuho.
David

On Wed, Nov 6, 2024 at 4:04 PM Kazuho Oku <kazuhooku@gmail.com> wrote:

>
>
> 2024年11月5日(火) 14:33 David Schinazi <dschinazi.ietf@gmail.com>:
>
>> Hi Ben,
>>
>> Thanks for writing this. The mechanism for conversion is pretty
>> straightforward. I'll note however that it relies on the presence of the
>> `Capsule-Protocol: ?1` header field. Unfortunately we defined RFC 9297 to
>> make that optional. I would have preferred it be mandatory, for exactly the
>> reasons explained in your draft, but that was not the consensus at the
>> time. I think this should be mentioned in your draft, since your mechanism
>> doesn't work when the client doesn't send the optional header.
>>
>
> I wonder if we can solve the issue by slightly changing the phrasing from
> "if capsule-protocol header exists" to "if the extended protocol is known
> to use capsule-protocol"?
>
> It is slightly unfortunate that we'd have to have two ways of identifying
> if the tunnel is transferring capsules, but it'd be beneficial to cover
> CONNECT-UDP too.
>
>
>> David
>>
>> On Mon, Nov 4, 2024 at 7:17 PM Ben Schwartz <bemasc@meta.com> wrote:
>>
>>> Hi HTTPBIS
>>>
>>> Last year, Kazuho asked us to consider whether an intermediary can
>>> translate unrecognized HTTP Upgrade Tokens across HTTP versions [1].  The
>>> discussion concluded that this is not possible: an unrecognized Upgrade
>>> Token might have an arbitrary interaction with an HTTP extension, and the
>>> choice of method in HTTP/1.1 is not defined.
>>>
>>> A few days ago, Kazuho and I considered the narrower question of whether
>>> this translation is possible within the context of the Capsule Protocol.
>>> We have written a draft that would enable such translations:
>>>
>>> https://www.ietf.org/archive/id/draft-kb-capsule-conversion-00.html
>>>
>>> This draft would enable forward-compatible implementation of Capsule
>>> Protocol gateways by committing to some invariants about the Capsule
>>> Protocol.
>>>
>>> --Ben Schwartz
>>>
>>> [1]
>>> https://lists.w3.org/Archives/Public/ietf-http-wg/2023OctDec/0005.html
>>>
>>
>
> --
> Kazuho Oku
>