在有代理服务器的情况下，让IIS7的日志中显示用户真实的IP，而不是代理服务器的IP地址。就是用HTTP_X_FORWARDED_FOR代替REMOTE_HOST地址-In the case of a proxy server, so that the the IIS7 logs show users real IP instead of the IP address of the proxy server. HTTP_X_FORWARDED_FOR instead REMOTE_HOST ad