如何在ASP.NET中实现GZip压缩？

  <urlCompression doStaticCompression="true" doDynamicCompression="true" />
  <httpCompression>
   <dynamicTypes>
      <add mimeType="text/*" enabled="true" />
      <add mimeType="message/*" enabled="true" />
      <add mimeType="application/x-javascript" 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="application/x-javascript" enabled="true" />
      <add mimeType="*/*" enabled="false" />
    </staticTypes>
    <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
  </httpCompression>
</system.webServer>

protected void Application_BeginRequest(object sender, EventArgs e)
{
    HttpApplication app = sender as HttpApplication;
    string acceptEncoding = app.Request.Headers["Accept-Encoding"];
    if (!string.IsNullOrEmpty(acceptEncoding) && acceptEncoding.Contains("gzip"))
    {
        app.Response.Filter = new GZipStream(app.Response.Filter, CompressionMode.Compress);
        app.Response.AppendHeader("Content-Encoding", "gzip");
    }
}