[tkot]

> Host: (always present, not always visible)

Hostname can be skipped in file URI and localhost will be assumed, maybe that's what the author meant.

[deathanatos]

Ho! You're right, that is a corner case. It has the netloc's starting sigil ("//") but there's nothing prior the path.

I was just uncertain enough on that one that I didn't want to say it never happens, and I'm kinda glad I didn't.