SameHost compares two URLs by host name (case insensitively) and port
(treating the scheme's default port as no port) so redirect policies
can tell a real change of host from a server spelling its own host
differently, e.g. redirecting "https://example.com/" to
"https://EXAMPLE.com:443/".
The HTTPS downgrade check now compares the redirect target against
the original request rather than the previous hop, so a chain which
started on plaintext http, passed through an https server and came
back to http is no longer refused - nothing is being downgraded
relative to what the user asked for. A chain which started on https
and reaches http via any number of hops is still refused.
Nick Craig-Wood
31a8164815