Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/2830
@Trojan295 Thanks for the PR! The code looks good but I ran into an issue
when attempting to log out. Despite being a required field in the openid spec
[1], it appears that at least in practice [2] the `end_session_endpoint` field
is not guaranteed to be present. I think we may need to account for this
possibility in the logout endpoint.
[1] https://openid.net/specs/openid-connect-session-1_0.html#OPMetadata
[2] https://accounts.google.com/.well-known/openid-configuration
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