Many frameworks allow you to route URLs to actions instead of mapping to a file. I just tested it in one of my Symfony projects, and I was able to route /login and //login to two separate controllers.

Furthermore, it's pretty common to rewrite URLs, doing things like adding/removing trailing slashes, whatever. So it wouldn't be too difficult to have it condense multiple slashes into just one.

For example, this link worksfine: google.com//////////////////////////////////search?q=foobar

Google search tries to cover a lot of typos or be pretty user-friendly for people who don't understand tech. I wouldn't be surprised if there's a grandma out there who thinks http://google.com//search is the correct method.

no one will ever know.