[Bug 43035] A method to avoid downloading the roster at every connection

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=43035

--- Comment #3 from Alban Crequy <alban.crequy at collabora.co.uk> 2011-11-21 05:46:50 PST ---
(In reply to comment #2)
> Be aware of this bit from RFC 3921 §7.3: "If an available resource does not
> request the roster during a session, the server MUST NOT send it presence
> subscriptions and associated roster updates."
> 
> If we get presence in its role as contact-list change notification, or a roster
> push, then we should probably download the contact list automatically at that
> point, as an attempt to resync. (The above means that only buggy servers can
> cause that situation, I think - but it wouldn't surprise me at all if semi-XMPP
> bridge-based servers like Facebook and Windows Live don't obey §7.3.)

Ok...

Both GTalk and Facebook don't obey §7.3. and send the presence notifications
anyway: I see the presence changing in the Empathy chat window even when roster
requests are disabled in Gabble.

> Would XEP-0237 Roster Versioning remove the need to avoid downloading the
> roster? (I don't know which servers support 0237, though, and I suspect that
> it's the big, popular ones - like GTalk and Facebook - that are least likely to
> do so.)

Yes, XEP-0237 would be good but GTalk and Facebook don't support it.

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