文档地址:https://docs.microsoft.com/zh-cn/iis/extensions/configuring-application-request-routing-arr/http-load-balancing-using-application-request-routing
下载Web Platform installer V5.0地址:https://www.microsoft.com/web/downloads/platform.aspx
安装程序:应用程序请求路由3.0 Beta(英文)
如图: