其实我想问的就是，所谓文件是不是最新的，是基于什么判断的？文件完全一样就是最新？
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看RFC，送HEAD请求，再根据各种和最近修改时间有关的header来判断 http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html
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"When running Wget with -N, with or without -r or -p, the decision as to whether or not to download a newer copy of a file depends on the local and remote timestamp and size of the file. -nc may not be specified at the same time as -N."
man里面的解释是根据timestamp和size. |
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