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

Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Wed, 17 April 2013 11:41 UTC

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Date: Wed, 17 Apr 2013 14:39:26 +0300
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
To: Gabriel Montenegro <Gabriel.Montenegro@microsoft.com>
Cc: "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
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Subject: Re: HTTP/2.0 section 2.4 "Starting HTTP/2.0 with Prior Knowledge"
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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.

-Ilari

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