Post和Put的区别

1.在Http中，post被定义为idempotent。而put不是。
idempotent：Methods can also have the property of “idempotence” in that (aside from error or expiration issues) the side-effects of N > 0 identical requests is the same as for a single request.”

意思为：一个方法重复执行多次，其效果一样。post多次访问服务器同一个url，其服务器返回的结果是一样的，而put则不一样。