Ensure your applications return the proper status code.
确保应用程序返回正确的状态码。
What we may - and should - do is simply return an HTTP 304 status code.
我们可能而且应该做的仅仅是返回一个HTTP 304状态码。
It isn't enough for the root of the directory to return a 404 status code, because it's possible for a directory to return a 404 but still serve out files underneath it.
对于根目录,只返回404状态代码是不够的,因为尽管目录返回404状态代码,但有可能在目录之下还有文件。
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