the issue with that is that there can only be one page per url. even when the page is hidden, the post actually still exists; you don't have the permission to see it, but i can. to make the request you're thinking of possible, it would be that hidden-post redirects to a page that just says the post is hidden. however, i don't see much point in that, as the post would still exist and be visible to those with permissions, and that would just complicate things. i hope this makes sense.