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curl wget判断一个文件是不是足够新去下载

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场景:

如果源站文件有更新,则重新下载。如果没有更新,则不下载。全部是根据 Last-Modified 来判断。

http://blog.yjl.im/2012/03/downloading-only-when-modified-using.html
http://blog.yjl.im/2012/03/downloading-only-when-modified-using_23.html


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