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Re: Expect: + Upgrade: = ...

From: Martin Thomson <martin.thomson@gmail.com>
Date: Wed, 4 Sep 2013 09:30:43 -0700
Message-ID: <CABkgnnVMqGYyNOBo6d=tmFpUPadQ6c3Cv+s39PNpnr5TNbvYaA@mail.gmail.com>
To: Daniel Stenberg <daniel@haxx.se>
Cc: HTTP Working Group <ietf-http-wg@w3.org>
On 4 September 2013 01:39, Daniel Stenberg <daniel@haxx.se> wrote:
> The effect seems to risk a little more data waste in the HTTP+upgrade case.

Yeah, I'm thinking that for https: URLs it's easy.  ALPN means that
there is no probing.  And you get the option to use flow control.  In
fact, that's actually much nicer.

For http: URLs, it's a little trickier.  You might do a HEAD request
for the upgrade request, followed by a POST after the upgrade
completes.  That's round trips still, and if the upgrade fails, it's
even worse.  Though, I'll note that it's still the same speed in the
success case as the https: URL case ...
Received on Wednesday, 4 September 2013 16:31:11 UTC

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