使用web.config Gzip IIS 7.5不起作用

Question

我在IIS 7.5服务器上的web.config中使用以下代码来启用gzip，但它不起作用。主持人说我的代码中有错误。有人能帮帮我吗？

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <directoryBrowse enabled="false" />
        <defaultDocument>
            <files>
                <clear />
                <add value="Default.htm" />
                <add value="Default.asp" />
                <add value="index.htm" />
                <add value="index.html" />
                <add value="iisstart.htm" />
                <add value="default.aspx" />
                <add value="index.php" />
            </files>
        </defaultDocument>

      <httpCompression directory="%SystemDrive%\inetpub\
    temp\IIS Temporary Compressed Files">
        <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll"/>
        <dynamicTypes>
          <add mimeType="text/*" enabled="true"/>
          <add mimeType="message/*" enabled="true"/>
          <add mimeType="application/javascript" enabled="true"/>
          <add mimeType="*/*" enabled="false"/>
        </dynamicTypes>
        <staticTypes>
          <add mimeType="text/*" enabled="true"/>
          <add mimeType="message/*" enabled="true"/>
          <add mimeType="application/javascript" enabled="true"/>
          <add mimeType="*/*" enabled="false"/>
        </staticTypes>
      </httpCompression>
      <urlCompression doStaticCompression="true" doDynamicCompression="true"/>
    </system.webServer>
</configuration>