# File lib/omniauth/strategies/cas3.rb, line 152
      def service_validate_url(service_url, ticket)
        service_url = Addressable::URI.parse(service_url)
        service_url.query_values = service_url.query_values.tap { |qs| qs.delete('ticket') }
        cas_url + append_params(options.service_validate_url, {
          service: service_url.to_s,
          ticket: ticket
        })
      end