Tanto per gustarci un po’ di cose “tricky” sui vari server e servizi XMPP diffusi ultimamente nella rete, qui una lista di risposte disco#info (XEP-0030: Service Discovery) aggiornate al 6 giugno 2012:
messenger.live.com
<iq from="messenger.live.com" id="3" to="xxx@messenger.live.com/{af7ed31f-5f9b-4198-b745-ae613ce63c2a}" type="result"> <query xmlns="http://jabber.org/protocol/disco#info"> <identity category="server" type="im" /> <feature var="http://jabber.org/protocol/disco#info" /> <feature var="vcard-temp" /> <feature var="urn:xmpp:ping" /> <feature var="jabber:iq:roster" /> <feature var="http://messenger.live.com/xmpp/jidlookup" /> <feature var="urn:xmpp:archive:auto" /> </query> </iq>
chat.facebook.com
<iq from="chat.facebook.com" to="xxx@chat.facebook.com/cudumar-xmpp_a389d347_4C1CCC07E13F9" id="3" type="result"> <query xmlns="http://jabber.org/protocol/disco#info"> <identity category="server" type="im" name="Facebook Jabber" /> <feature var="http://jabber.org/protocol/commands" /> </query> </iq>
google.com (gtalk)
<iq to="xxx@gmail.com/cudumar-xmA4CD5484" from="xxx@gmail.com" id="3" type="result"> <query xmlns="http://jabber.org/protocol/disco#info"> <identity category="account" type="registered" name="Google Talk User Account" /> <feature var="http://jabber.org/protocol/disco#info" /> <feature var="http://jabber.org/protocol/disco#items" /> <feature var="msgoffline" /> </query> </iq>
Il server GTalk di google non supporta query disco#info client-to-server (restituisce ), ma solo client-to-client.
Facebook invece viceversa, supporta solo richieste disco#info client-to-server.
Windows Live Messenger invece supporta correttamente richieste client-to-server. Nel caso di richieste client-to-client il server restituisce una risposta standard dal dubbio significato e dalla dubbia utilità:
<iq from="messenger.live.com" id="5" to="xxx@messenger.live.com/{2ddd7d77-0687-49ba-a6c4-efe52ad54b34}" type="result"> <query xmlns="http://jabber.org/protocol/disco#info"> <identity category="account" type="registered" /> <feature var="http://jabber.org/protocol/disco#info" /> <feature var="http://jabber.org/protocol/chatstates" /> </query> </iq>
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