Support OpenID Connect Discovery
https://server.com/.well-known/openid-configuration
should serve a OpenID Connect Discovery JSON listing of the OpenID/OAuth endpoints, supported scopes and claims, public keys used to sign the tokens, and other details.
The spec can be found here: https://openid.net/specs/openid-connect-discovery-1_0.html and here: https://swagger.io/docs/specification/authentication/openid-connect-discovery/