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在写网络爬虫的时候，需要根据链接来获取文件类型，将内容正确存储。之前我都是根据链接的后缀来判断的，比如：http://img12.360buyimg.com/da/20120330/88_31_ZySDre.jpg这个链接指向的文件就是个jpg文件。但是后来发现有诸如

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