default boolean validateIssuer(final WebContext webContext, final List<String> endpoints) {
        return validateIssuer(webContext, endpoints, null);
    }
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 endpoint
@return true/false
support/cas-server-support-oidc-core-api/src/main/java/org/apereo/cas/oidc/issuer/OidcIssuerService.java