mod_http_oauth2: Validate all URIs against client_uri in client registration
Validating against all redirect URIs didn't work for OOB-only clients,
which happens to be what I was testing with.
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summary: Log a message once per minute
...
This module sends `-- MARK --` to the log once per minute. This may be
useful to give a sense of how busy the server is or see that logging and
timers are still working.