class CustomFailure < Devise::FailureApp
    def redirect_url
      new_user_session_url(:subdomain => 'secure')
    end
 
    def respond
        if http_auth?
           http_auth
        else
           store_location!
           flash[:alert] = i18n_message unless flash[:notice]
           redirect_to redirect_url,:status => 401
        end
    end
end

编辑

或者,我想显示Flash消息并保留在同一页面上,但添加以下代码行：

render :text => "unauthorized",:status => 401

造成红宝石抱怨：

undefined method `render' for #<CustomFailure:0x00000103367f28>

这里发生了什么