http的幂等性及幂等性【转】

https://blog.csdn.net/xiaoxiaoxuanao/article/details/52593921html 参考： https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html http://www.cnblogs.com/weidagang2046/archive/2011/06/04/2063696.htmlweb

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