[Zope] Please help! can't do a redirect in a access rule

Hi, I'm trying to give access to a folder, only if a user has a value in is session. I configured a Site Access Rule that looks like this: if context.REQUEST['BASE0'].find('zope') > -1: return #does nothing for now elif context.REQUEST.SESSION.has_key('give_access'): return #does nothing for now context.REQUEST.RESPONSE.redirect(context.REQUEST['BASE0']) I search for the word "zope" on the url base, to have always access to the workspace virtual host. If this is not the best way to do this, please feel free to give sugestions. thanks, --Bruno