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mind3x 2014 年 8 月 28 日 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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WKPlus 2014 年 8 月 28 日 "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. |