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RE: HTTP/2.0 section 2.4 "Starting HTTP/2.0 with Prior Knowledge"

Gabriel Montenegro <Gabriel.Montenegro@microsoft.com> Wed, 17 April 2013 21:33 UTC

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From: Gabriel Montenegro <Gabriel.Montenegro@microsoft.com>
To: Martin Thomson <martin.thomson@gmail.com>, Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
CC: "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
Thread-Topic: HTTP/2.0 section 2.4 "Starting HTTP/2.0 with Prior Knowledge"
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Date: Wed, 17 Apr 2013 21:29:51 +0000
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Subject: RE: HTTP/2.0 section 2.4 "Starting HTTP/2.0 with Prior Knowledge"
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> On 17 April 2013 04:39, Ilari Liusvaara <ilari.liusvaara@elisanet.fi> wrote:
> > On Wed, Apr 17, 2013 at 01:15:34AM +0000, Gabriel Montenegro wrote:
> >> http://http2.github.io/http2-spec/#known-http says:
> >>
> >> A client can learn that a particular server supports HTTP/2.0 by
> >> other means. A client MAY immediately send HTTP/2.0 frames to a
> >> server that is known to support HTTP/2.0. This only affects the resolution
> of "http:"
> >> URIs, servers supporting HTTP/2.0 are required to support protocol
> >> negotiation in TLS<http://http2.github.io/http2-spec/#TLSNPN> [TLSNPN].
> >>
> >> The above fails to include "https:" URIs. It only mentions "http:" URIs.
> >
> > HTTPS is over TLS, so NPN (ALPN) is a requirement and will reveal if
> > server supports HTTP2 without additional RTTs.
> 
> That was certainly the intent of the text.  However, I know that Gabriel is a
> pretty smart guy and he has been paying attention.  If this isn't obvious, we
> should definitely make it more so.
> 
>    This only affects the resolution of "http:" URIs, servers supporting HTTP/2.0
> are required to
>    support <xref target="TLSNPN">protocol negotiation in TLS</xref> for
> "https:" URIs.
> 
> https://github.com/http2/http2-
> spec/commit/329d29e58a88628435ebd4678d3a3bd250155d47
> 
> (Note, the ALPN edit isn't in yet, the reference will need to change.)

I was just wondering about the twitter apps scenario. Jeff Pinner indicated in Tokyo that for some scenarios (non-browser based apps using their specific servers), they forgo any TLS negotiation as the client simply knows that those particular servers talk HTTP/2.  This allows them to deploy with no dependency on anything but the usual TLS on their target platforms. 

It seems like a valid scenarios for "prior knowledge", but I'll let Jeff argue for that. I'm ok with requiring ALPN as the text currently implies (might help to make it explicit, yes).

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