No Action Defined for "#{base}/saml/attributes"

[Mike Vastola]

The configuration in the README.md has this line:

config.attribute_service_location = "#{base}/saml/attributes"

.. but neither SamlIdp::IdpController nor SamlIdp::Controller seem to define an method that is meant to be mapped to this route.

Can the documentation be provided to offer example logic to handle this action?