How do I get the current Url from within a FilterAttribute?

Question

I am writing an Authorize filter attribute adn I\'m having trouble figuring out how to get the current url as a string so I can pass it as a parameter to the LogOn action. The g

Answer 1

In my specific case I was after the UrlReferrer URL.

filterContext.HttpContext.Request.UrlReferrer

This one let me redirect the user back to the page he was before trying to access an action he doesn't have permission to access.