Actually, not encoded slashes in the paths are not that unheard of as one might think. As an example, this is actual Wikipedia article about... the meaning of "

Actually, not encoded slashes in the paths are not that unheard of as one might think. As an example, this is actual Wikipedia article about... the meaning of "two slashes": https://en.wikipedia.org/wiki/// https://en.wikipedia.org/wiki/// . Also, encountering buggy concatenations like example.com//some-path or example.com/base//some-path is quite common. Don't ask how I know.