# File lib/omniauth/strategies/cas3.rb, line 90
      def request_phase
        service_url = append_params(callback_url, return_url)

        [
          302,
          {
            'Location' => login_url(service_url),
            'Content-Type' => 'text/plain'
          },
          ["You are being redirected to CAS for sign-in."]
        ]
      end