If "sourceURL" means "the URL which was used to make this request", then the request object has methods to get that. I don't think there's a method which gets you the whole thing all at once, but (I'm not looking at the documentation right now) I recall there is getHost() and getPort(), and there are others to get the other parts of the URL.
Joined: Nov 23, 2010
So, no luck with any of that , but I took a peak at request object at debugger and it contains array naned specialAttributes with 9 elements , of which 5 and 7 contains inf on 'sourceURL' thing.
How to get that out, there is no request,getSpecialAttribute or something like that ?