mod_http_oauth2: Disable CORS for authorization endpoint Per recommendation in draft-ietf-oauth-security-topics-23 Hopefully it is enough to return an error status, since mod_http will add CORS headers from a handler with higher priority, even for OPTIONS.

This module discards typing notifications sent to a bare host JID,
preventing error replies to be sent. These errors are harmless but can
be annoying sometimes if your client shows them prominently.