[jdev] last presence confusion
justin-keyword-jabber.093179 at affinix.com
Sat Dec 22 14:23:38 CST 2007
On Thursday 20 December 2007 2:52 pm, Peter Saint-Andre wrote:
> 2. Else, if the contact has no available resources, the server MUST
> either (1) reply to the presence probe by sending to the user the
> full XML of the last presence stanza of type "unavailable"
> received by the server from the contact, or (2) not reply at all.
> So a nice server will return the last unavailable presence information
> (with a Delayed Delivery flag), thus obviating the need for a flood of
> jabber:iq:last requests.
The problem is that the server might choose the second option, which is to not
reply at all, and a client cannot know the difference between a slow server
or a no-reply server. Thus, the client still has to make a decision to send
iq:last to everyone or to no one.
How about emphasizing the first option as a SHOULD? This would hopefully
encourage new servers to always reply, while not causing existing servers to
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