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Re: Rechartering HTTPbis

Willy Tarreau <w@1wt.eu> Thu, 26 January 2012 09:39 UTC

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Date: Thu, 26 Jan 2012 10:37:48 +0100
From: Willy Tarreau <w@1wt.eu>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
Cc: "William A. Rowe Jr." <wrowe@rowe-clan.net>, Amos Jeffries <squid3@treenet.co.nz>, ietf-http-wg@w3.org
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Subject: Re: Rechartering HTTPbis
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On Thu, Jan 26, 2012 at 09:32:57AM +0000, Poul-Henning Kamp wrote:
> >Or OPTIONS * HTTP/2.0\nHost: thathost.com - or its transparent equivalent.
> 
> The problem with that is that if it is a HTTP/1.1 only server, you loose
> a round-trip or worst case a connection.
> 
> All clients will have to cope with HTTP/1.1-only servers for ages,
> so making the first request on a connection always be HTTP/1.1, and
> then if/when the reply indicates HTTP/2.0 capability, upgrade to 2.0
> avoids wasting a round-trip.

Indeed, and you also benefit from the existing TCP congestion window.

Willy

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