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 12:11 UTC

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Date: Sun, 24 Jul 2011 14:11:47 +0200
From: Willy Tarreau <w@1wt.eu>
To: =?iso-8859-1?Q?I=F1aki?= Baz Castillo <ibc@aliax.net>
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References: <CAP992=FrX5VxP2o0JLNoJs8nXXba7wbZ6RN9wBUYC0ZSN_wbAg@mail.gmail.com> <9031.1311270000.588511@puncture> <CALiegf=pYzybvc7WB2QfPg6FKrhLxgzHuP-DpuuMfZYJV6Z7FQ@mail.gmail.com> <CAP992=FJymFPKcPVWrF-LkcEtNUz=Kt9L_ex+kLtjiGjL1T46w@mail.gmail.com> <4E28A51F.4020704@callenish.com> <CALiegf=4K2oWfmZjGMD7J_jyaDtS3i+Mu7R0Wh75Rr+MrQCjtw@mail.gmail.com> <20110722054345.GE18126@1wt.eu> <9031.1311500145.687172@puncture> <20110724105223.GL22405@1wt.eu> <CALiegfkTVg2=k4d8rxmpqXmaRUihRmhtgfF4QRUTAKic7gBk5w@mail.gmail.com>
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Cc: 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 01:47:36PM +0200, Iñaki Baz Castillo wrote:
> 2011/7/24 Willy Tarreau <w@1wt.eu>eu>:
> > No I'm not saying that because I don't understand what you mean here.
> > What I'm saying is that browsers try to reuse existing connections to
> > host:port. So if you want to connect to ws://example.com/foo/bar and
> > the browser already has a connection to example.com:80 because of a
> > previous HTTP request to that host, it's much advantageous for it to
> > reuse that existing connection.
> >
> > Making an additional DNS request and a connection come with a cost.
> 
> http://tools.ietf.org/html/draft-ibc-websocket-dns-srv-02#section-5.2

You still need the DNS request : the client does an A/AAAA request for
the HTTP host, then if you ask it to use an SRV record for the WS connection,
it must perform that request too, even if it's to conclude that it can reuse
the idle connection.

Regards,
Willy