Re: [hybi] Last Call: <draft-ietf-hybi-thewebsocketprotocol-10.txt> (The WebSocket protocol) to Proposed Standard

Willy Tarreau <w@1wt.eu> Sun, 24 July 2011 12:16 UTC

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Date: Sun, 24 Jul 2011 14:16:22 +0200
From: Willy Tarreau <w@1wt.eu>
To: =?iso-8859-1?Q?I=F1aki?= Baz Castillo <ibc@aliax.net>
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Cc: "Roy T. Fielding" <fielding@gbiv.com>, Server-Initiated HTTP <hybi@ietf.org>, IETF-Discussion <ietf@ietf.org>
Subject: Re: [hybi] Last Call: <draft-ietf-hybi-thewebsocketprotocol-10.txt> (The WebSocket protocol) to Proposed Standard
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On Sun, Jul 24, 2011 at 01:42:26PM +0200, Iñaki Baz Castillo wrote:
> 2011/7/23 Roy T. Fielding <fielding@gbiv.com>om>:
> >> Right. If WS borns with no SRV (as a MUST for WS clients) then just
> >> forget it and let inherit all the ugly limitations from HTTP protocol.
> >
> > I am tired of this.  SRV is not used for HTTP because SRV adds latency
> > to the initial request for no useful purpose whatsoever.
> 
> And I'm really tired of hearing the argument of the "latency" which
> nobody demostrates (but just talks about it without replying me how
> the same is not a problem in realtime protocols like SIP and XMPP).

Because you have never worked in a mobile phone environment. You'd be
amazed to see what end users are paying for ! Count 300-500 ms on average
for a DNS request.

> > In contrast, HTTP is deployed in an anarchic
> > manner in which there are often several HTTP servers per machine
> > (e.g., tests, staging, production, CUPS, etc,).
> 
> Could you explain me why DNS A is good but DNS SRV is bad in such
> "anarchic" deployments?

DNS is not mandatory for HTTP. It's not "DNS A" which makes it good, but
"no mandatory DNS". This is a huge difference.

Regards,
Willy