1) Sometimes, when you click at a proxied link, you get a splash screen called "External Redirect" where you have to click at "Continue…" to load the external page.
2) And some other proxied links (the code in the html source looks exactly the same like the other ones) doesn't show such splash screens and rather directly load the external url.
I've also found that only situations like 2) are shown in the link proxy log. If you get a splash screen the use of the link is not recorded in the log (maybe a bug?)
Can someone please explain why external links are handled differently by the proxy system (see 1) and 2) above) and what exactly triggers how they are handled (if they show a splash screen or not)?