mod_http_oauth2: Specify that 'contacts' items are emails in client registration Not enforced, but good for documentation. > Array of strings representing ways to contact people responsible for > this client, typically email addresses. "typically" isn't a great word in a specification, so one could persume this may be e.g. URLs like https://example.com/contact-us or so as well.

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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.