+1  A: 

See this question http://stackoverflow.com/questions/591694/url-encoded-slash-in-url.

Even UrlEncode will not help here. The behaviour changes in MVC2.

Malcolm Frexner
I've edited .. check again please!
Galilyou
A: 

Modify your route as /myaction/{*inputURL*}. This will catch all after myaction.

Christian13467
I already have a catch-all route set to something else. I can't have more than one catch-all routes.
Galilyou