HTTP PUT 和 POST 的区别？

[xiaqinglin]

现在在写一个 restful 接口，想问下大神么 HTTP 方法里 PUT 和 POST 的区别，我看了一些文章提到“幂等”的概念，即“ PUT 方法是幂等的。幂等的方法意味着请求成功执行所得到的的结果不依赖于该方法被执行的次数。”，但是还是不太能理解？

还有我写 restful 接口的时候，做更新操作的时候是不是只要实现 put 或者 post 中的一个就可以了？不需要两个一起实现？

[zivsu]

Use PUT when you can update a resource completely through a specific resource. For instance, if you know that an article resides at http://example.org/article/1234, you can PUT a new resource representation of this article directly through a PUT on this URL.

If you do not know the actual resource location, for instance, when you add a new article, but do not have any idea where to store it, you can POST it to an URL, and let the server decide the actual URL.

[mingyun]

@zhujinliang 解释到位

[chengs]

PUT 原意是指定路经 post 文件

[fundebug]

幂等即 idempoten

> 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.

意思就是执行多次结果是一样的。

PUT 是 idempotent 的方法，而 POST 不是。

https://blog.fundebug.com/2018/11/09/http-method-put-vs-post/