IIS ARR 如何才能实现透明反代？

[杀棋已至]

                <rule name="RewriteRemoteAddr">
                    <match url="(.*)" />
                    <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
                        <add input="{HTTP_X_FORWARDED_FOR}" pattern="([_0-9a-zA-Z]+)" />
                    </conditions>
                    <serverVariables>
                        <set name="{REMOTE_ADDR}" value="{HTTP_X_FORWARDED_FOR}" replace="true" />
                    </serverVariables>
                    <action type="None" />
                </rule>

我尝试这样好像不行，谢谢。。