However, we will discuss the tradeoffs between implementing URL rewriting as an ISAPI filter versus using techniques available in ASP.NET.

不过，我们将对使用ISAPI筛选器与使用ASP.NET中的技术实现url重写进行权衡。

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Compression is handled through an ISAPI filter, which is installed at the WWW Service level and is configured for the entire Web server rather than for specific Web sites.

通过一个ISAPI过滤器来处理压缩。这个过滤器安装在WWW service级，它是针对整个Web服务器(而不是特定Web站点)配置的。

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