Don't allow URLs that contain non-normalized paths to be verified (#20999)

* Don't allow URLs that contain non-normalized paths to be verified

This stops things like https://example.com/otheruser/../realuser where
"/otheruser" appears to be the verified URL, but the actual URL being
verified is "/realuser" due to the "/../".

Also fix a test to use 'https', so it is testing the right thing, now
that since #20304 https is required.

* missing do