AF.request(url,
               method:.post,
               parameters:dicts,
               encoder:JSONParameterEncoder.default,
               headers: ["Accept":"application/json"])
    AF.request(url,
               method: .put,
               parameters: dicts,
               encoding:JSONEncoding.default,
               headers: ["Accept":"application/json","Authorization":"xxx"])

encoder 代表parameters 参数需要传入[String:Any] 或者继承Encodable 的struct
用于系统的json协议
encoding表示parameters 转为json字符串