Hello,
Below is an excerpt from draft-ietf-xmpp-im-22.txt Section 7.4.
(Seen from the Client Side:) It states the following described in a scenario:
a) User Adds Item to Roster b) Server Sends Roster via IQ-Set (and provides an id="someid") c) Server send IQ-Result
NOW to the problem: IT states:
d) All receicing Users should send IQ-Result with the ID from the IQ-Set
Problem is: Neither Jabber 1.4.2 NOR Tipiq' Timp 1.1 sends ANY ID in the IQ-Set.
I have tried sending an IQ-Result back, but that only results in error messages from the Server. Not sending ANY response back at all works fine for both servers, and looks like the logical thing to do.
You're absolutly right that this behaviour is incorrect. The problems goes even deeper though, according to the XMPP spec you're not even allowed to send an <IQ> stanza without an ID (see XMPP-Core). So in your implementation you could assume for backwards compatibility reasons, whenever you get an <IQ> stanza with no id you do not have to reply to it (since it's really malformed), but it's best to still parse it.
Note however that the XMPP spec states that changes to roster are already made final, before receiving the IQ result stanzas from the clients or even sending out the IQ set stanzas. Wether or not the server receives the IQ results is only important for knowing what the roster looks like on the client side (or what it theoretically should look like anyway), I don't know of any server that maintains or uses this information for anything yet.
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