浏览器向服务器发送请求一个资源，例如test.js，使用浏览器端缓存，会将test.js保存在浏览器端
第二次在发送同样的请求到服务器上，服务器会返回304状态，文件没有被修改，可否设置什么http头的信息或其他方式
在浏览器第二次发送请求时，如果缓存中有，就直接从缓存中获得，都不需要再向服务器发送请求检查文件
是否改变？
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set-expire


>From: "Super Wu" <superwunc在gmail.com>
>Reply-To: python-chinese在lists.python.cn
>To: python-chinese在lists.python.cn
>Subject: [python-chinese] 关于http状态码的问题
>Date: Tue, 17 Jul 2007 21:52:45 +0800
>
>浏览器向服务器发送请求一个资源，例如test.js，使用浏览器端缓存，会将test.js
保存在浏览器端
>第二次在发送同样的请求到服务器上，服务器会返回304状态，文件没有被修改，可否
设置什么http头的信息或其他方式
>在浏览器第二次发送请求时，如果缓存中有，就直接从缓存中获得，都不需要再向服
务器发送请求检查文件
>是否改变？


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用头信息If-Modified-Since，头信息的值就填服务器上次返回给你的Last-Modified
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URL: http://python.cn/pipermail/python-chinese/attachments/20070717/8fcc0a3a/attachment.htm 

apache 的 expire 模块

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>
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> >From: "Super Wu" <superwunc at gmail.com>
> >Reply-To: python-chinese at lists.python.cn
> >To: python-chinese at lists.python.cn
> >Subject: [python-chinese] ¹ØÓÚhttp״̬ÂëµÄÎÊÌâ
> >Date: Tue, 17 Jul 2007 21:52:45 +0800
> >
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>
> >_______________________________________________
> >python-chinese
> >Post: send python-chinese at lists.python.cn
> >Subscribe: send subscribe to python-chinese-request at lists.python.cn
> >Unsubscribe: send unsubscribe to  python-chinese-request at lists.python.cn
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> Post: send python-chinese at lists.python.cn
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