default boolean validateIssuer(final WebContext webContext, final List<String> endpoints,
                                   final OidcRegisteredService registeredService) {
        return true;
    }
Is valid issuer for endpoint.
This operation should calculate the expected issuer from the request
and compare that with the system-defined issuer, while considering
the endpoint that is requesting access.

@param webContext        the web context
@param endpoints         the endpoints
@param registeredService the registered service
@return the boolean
support/cas-server-support-oidc-core-api/src/main/java/org/apereo/cas/oidc/issuer/OidcIssuerService.java