# File cas.rb, line 71
      def validate_service_ticket(st)
        RAILS_DEFAULT_LOGGER.debug 'CAS: Starting to validate service ticket...' unless not defined? RAILS_DEFAULT_LOGGER
        uri = URI.parse(validate_url)
        h = uri.query ? query_to_hash(uri.query) : {}
        h['service'] = st.service
        h['ticket'] = st.ticket
        h['renew'] = 1 if st.renew
        h['pgtUrl'] = proxy_callback_url if proxy_callback_url
          
        # Add our domain parameter
        h['domain'] = Rmobio::Utils.get_domain(st.service)
        uri.query = hash_to_query(h)

        # Override the validation response
        st.response = request_cas_response(uri, Rmobio::Cas::MobioValidationResponse)
        @xml_response = st.response
        return st
      end