However, we will discuss the tradeoffs between implementing URL rewriting as an ISAPIfilter 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 ISAPIfilter, which is installed at the WWW Service level and is configured for the entire Web server rather than for specific Web sites.