It looks like $urlget can return 0 when the connection is refused or something. I'm doing a lot of successive $urlget call via milliseconds timers and at some points i get 0 from $urlget, I'm not sure if this is a bug but I'm assuming the website is refusing my connecting as an antispam protection and that cause $urlget to return 0. My point is that in this case the callback alias won't be triggered, all of this is not documented, it would be nice to know what 0 really means and how it's not going to trigger the callback alias.
