Re: [hybi] New Version Notification for draft-mcmanus-httpbis-h2-websockets-00.txt

Andy Green <andy@warmcat.com> Mon, 16 October 2017 03:09 UTC

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To: Martin Thomson <martin.thomson@gmail.com>
Cc: Patrick McManus <pmcmanus@mozilla.com>, hybi <hybi@ietf.org>, Cory Benfield <cory@lukasa.co.uk>, Patrick McManus <mcmanus@ducksong.com>, HTTP Working Group <ietf-http-wg@w3.org>
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From: Andy Green <andy@warmcat.com>
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Date: Mon, 16 Oct 2017 11:08:29 +0800
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Subject: Re: [hybi] New Version Notification for draft-mcmanus-httpbis-h2-websockets-00.txt
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On 10/16/2017 11:01 AM, Martin Thomson wrote:
> On Mon, Oct 16, 2017 at 1:57 PM, Andy Green <andy@warmcat.com>; wrote:

 >>> I think that you are exaggerating the cost here.  The ws handshake and

 >>Eh... why do you say that?  It takes less than 3 RTs?

>> That is 3 RTT, right?
> 
> I'm basing this off how I understand h2 to work, and the example in
> the draft shows an unnecessary extra RTT; that's all.
> 

Patrick himself says "...Again, I agree you could remove an rtt (or 
probably 2)..."

I think you misunderstood something... as it is he has to wait for the 
SETTINGs to tell him it's possible, wait for the CONNECT and response 
and wait for the ws handshake to go through before he can send 
something.  It's 3 x RTT AFAICS and nothing is "exaggerat[ed]".

That's alright if it's the default situation for HTTP/1 ws guys... but 
there should be a way like PUSH_PROMISE to dispense will all that junk 
for what will be increasingly common native-h2 ws client.

-Andy