/ is replaced with %2F in an URL string! :O

Hi all

I’m creating some URL’s myself (it is statical and not very beautiful,
but I don’t need more atm).

Sadly all the slashes “/” are replaced with “%2F” and so I get an error
like

Unknown action
No action responded to produkt_typ/10

When in fact it should call the action produkt_typ and submit the
parameter 10!

The same happens with a question mark: some_action?some_var=some_value
becomes

some_action%3Fsome_var%3Dsome_value

What is here going wrong? How can I solve it?

Thanks,
Josh