mod_http_oauth2: Return validation output added in trunk rev 72d7830505f0
It's not fun at all to try to register a client and only get back
"failed schema validation", this should help with that.
Introduction
============
This module checks the IP address of newly registered users against a
DNS block list. If a positive match is found, it gets logged.
Configuration
=============
Option Type Default
------------------- -------- ------------
registration\_rbl string *Required*