Go net/http获取body中json格式数据

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
)

type AutotaskRequest struct {
	RequestID string     `json:"requestid"`
	Clone     CloneModel `json:"clone"`
	Push      PushModel  `json:"push"`
}

type CloneModel struct {
	//TODO
	//"Method": string `json:"ceph"`
	RequestID   string `json:"requestid"`
	CallbackURL string `json:"callbackurl"`
}

type PushModel struct {
	RequestID   string `json:"requestiD"`
	CallbackURL string `json:"callbackuRL"`
	IP          string `json:"remoteip"`
	Port        int    `json:"remoteport"`
	User        string `json:"user"`
}

func test(w http.ResponseWriter, r *http.Request) {
	// r.ParseForm()
	defer fmt.Fprintf(w, "ok\n")

	fmt.Println("method:", r.Method)
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		fmt.Printf("read body err, %v\n", err)
		return
	}
	println("json:", string(body))

	var a AutotaskRequest
	if err = json.Unmarshal(body, &a); err != nil {
		fmt.Printf("Unmarshal err, %v\n", err)
		return
	}
	fmt.Printf("%+v", a)

}

func main() {
	http.HandleFunc("/test", test)
	http.ListenAndServe(":8888", nil)
}

　　客户端所传递参数如下：

{
    "requestid": "xxxxx",
    "clone": {
        "method": "ceph",
        "callbackurl": "xxx",
        "remoteip": "192.168.2.1",
        "remoteport": 8080,
        "user": "xxx",
        "pass": "xxx",
        "path": "xxx",
        "filename": "xxx"
    },
    "optimize": {
        "callbackurl": "xxx",
        "filter": {
            "k1": true,
            "k2": false
        },
        "trim": true,
        "progressive": true,
        "quality": 100,
        "colorNum": 256,
        "gifOptLevel": 2,
        "svgo": true,
        "guetzli": false,
        "css_rewrite": false,
        "js_rewrite": false
    },
    "push": {
        "method": "ceph",
        "callbackurl": "xxx",
        "remoteip": "192.168.2.1",
        "remoteport": 8080,
        "user": "xxx",
        "pass": "xxx",
        "path": "xxx",
        "filename": "xxx"
    }
}

json传递的参数中，服务端有的没有对应字段