A REST API (also known as RESTful API) is an application programming interface (API or web API) that conforms to the constraints of REST architectural style and allows for interaction with RESTful web services. REST stands for representational state transfer and was created by computer scientist Roy Fielding.
就是用URL定位资源，用HTTP描述操作。
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看Url就知道要什么
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看http method就知道干什么
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看http status code就知道结果如何