在封装请求库的过程中，我们会有两种请求内容的类型。一种是application/json，另一种是application/x-www-form-urlencoded。
相应的POST请求的body体使用如下
application/x-www-form-urlencoded
POST HTTP/1.1
Host: www.demo.com
Cache-Control: no-cache
Postman-Token: 81d7b315-d4be-8ee8-1237-04f3976de032
Content-Type: application/x-www-form-urlencoded
key=value&testKey=testValue
application/json
POST HTTP/1.1
Host: www.demo.com
Cache-Control: no-cache
Postman-Token: 81d7b315-d4be-8ee8-1237-04f3976de032
Content-Type: application/json
{key1: 'key1', key2: []}
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