The warning under the port example dates from #22007 (May 2023), when
a matchHost with a port but no scheme was parsed into an empty host and
the rule applied to every host. Since #29487 (37.421.0) massageHostUrl
prepends https:// to any matchHost that has no scheme and contains a
port or a path, so that warning no longer describes the behavior and
contradicts the note under hostRules.matchHost, which only mentions
paths.
Replace the warning with a note that states the current behavior for
ports and paths, and mention ports in the hostRules.matchHost note.
José M. Requena Plens
29033c3767