1994年，程序员开始重写操作系统的源代码，并以美国著名作曲家Copland的名字命名。

In 1994, programmers began a ground-up rewrite of the operating system, code-named Copland, after the famous American composer.

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也就是说，如果url需要重写，该操作将在任何一个内置HTTP模块运行后执行。

That means that if the URL needs to be rewritten, it will have done so by the time any of the built-in HTTP modules run.

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图5、6和7显示了操作中的url重写。

Figures 5, 6, and 7 show the URL rewriting in action.

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