mod_http_oauth2: Only require redirect URIs when using grant types that need it In the Device flow, no redirect URI is used because the client instead receives responses by polling. It is therefore unnecessary to enforce a requirement that these include redirect URI(s).

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summary: Log a message once per minute
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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.