def sign_out_url(return_to = nil)
      return_to = app_url(return_to) if return_to && URI.parse(return_to).relative?
      return_to ||= app_url(@action.path) if @action.http_method == :get
      sign_out_url = @controller.destroy_user_session_url(return_to: return_to)
      alg = algorithm(:sign_out_url, false)