Prove you control a site

The normal scan reads the same things a browser does. The deep scan asks for files such as /.git/HEAD and /.env. That is only polite to do on a site you run, so Wsec asks for a small proof first.

Host

Why this exists

Without it, anyone could point a scanner at a site they do not run and have it probe for backups and secrets. Both proofs need control of the site's files or its DNS, so they do the job. The file must be on the same host you entered, so a redirect to another host does not count.