Doors (holes-become-walls / walls-become-holes) are for controlling whether things can go through. URLs are for letting things through.

A url is not a door, but an archway, or possibly a door frame.

..and you're not allowed to walk into someone's house if they only have a door frame instead of a locked door. they are for preventing criminals from forcefully breaking in. but you don't have to break in to commit the crime. that's why it's called "breaking and entering" - there are two criminal acts committed.

An arch is not something that merely isn’t locked, but something that isn’t meant to even be closed.