Re: [hybi] Clarify the role of closing handshake

On Tue, Feb 15, 2011 at 13:45, <Yutaka_Takeda@playstation.sony.com> wrote:

>
> Okay, I admit my example was bad.
>
> Just to be clear, even with this code:
>
>       websocket.send("a-message-needs-to-reach-server")
>       websocket.close()
>
> From your opinions, programmers should not expect that the message always
> reach the server. (granted)
>
>
Yes, this point should be noted in the spec, or developers may
misunderstand.


> Now, here's another question for you.
>
> If onclose() callback is made on the websocket, would it be helpful if that
> callback (with wasClean=true) guarantees
> that the message has been delivered to the server?
>
>
Just to be sure, again I'd like to note that ... the complex algorithm in
-05 realizes this (wasClean=true iff received Close frame with "C"), but any
of the proposal A-1, A-2, B I wrote don't. What A-2 and B can do is just
avoiding RST hazard case.


> # trying to figure out whether graceful shutdown at least during 'closing'
> state would ever be helpful.
>
>
I personally think since an application can have its own ack to take care of
this, we don't have to have this feature as mandatory in WebSocket.


> Thanks,
> - Yutaka
>
>
> hybi-bounces@ietf.org wrote on 02/15/2011 12:33:28 PM:
>
>
> > On 2/15/11 1:30 PM, Brian wrote:
> >
> > > If you need, with websocket, to detect that the user's gone
> > > away (such as for an IM system to show that they're offline), you can
> > > do that on the server when you detect the connection is closed.  If
> > > you're using xhr-polling or similar, a reasonably short timeout on the
> > > server during which the user doesn't reconnect for more data should
> > > suffice as a suitable "user has gone away" event.
> >
> > Agreed. And this is what we do in IM systems like XMPP (whether using
> > the TCP binding or BOSH).
> >
> > Peter
> >
> > --
> > Peter Saint-Andre
> > https://stpeter.im/
> >
> >
> >
> > [attachment "smime.p7s" deleted by Yutaka Takeda/R&D/SCEA]
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