The proxy provider matches external_host exactly, so Host=www matched zero
providers and Authentik answered its error page while the naked domain
served the homepage. Flip the topology: www.franksdank.cloud is the one
guarded vhost carrying the homepage through Anubis -> Authentik -> :8017;
franksdank.cloud (plus legacy names and the bare-IP catch-all) 308-redirects
onto www before any challenge. Tests flipped to assert the new contract.
Frank
8898740ca4