Gajim doesn't show url in headline messages (xmlns='jabber:x:oob')
When gajim receives a message of type headline containing an url it doesn't show that url to the user. The headline mode is often used by automated services to deliver a short summary of a news items, not showing the url makes it hard to get to the original article to read the full version.
<message from='jid1' to='jid2' type='headline'> <subject>bla</subject> <body>bla</body> <x xmlns='jabber:x:oob'> <url>http://url.example.com\ <desc>bla</desc> </x> </message>