请问 go 获取 post 请求返回体的 字符类型为[]uint8, 但是是 xml 的格式，怎么转换成 json

body, err := ioutil.ReadAll(res.Body)<br> fmt.Println("post send success")<br> fmt.Printf("type is %T\n", body)<br> fmt.Printf("body is %#v\n", body)<br> 结果：<br> post send success<br> type is []uint8<br> <?xml version="1.0" encoding="utf-8" ?><returnsms><br> <errorstatus><br> <error>2</error><br> <remark>sign 参数错误</remark><br> </errorstatus><br> </returnsms><br> body is []byte{0x3c, 0x3f, 0x78, 0x6d, 0x6c, 0x20, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x3d, 0x22, 0x31, 0x2e, 0x30, 0x22, 0x20, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x3d, 0x22, 0x75, 0x74, 0x66, 0x2d, 0x38, 0x22, 0x20, 0x3f, 0x 3e, 0x3c, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x73, 0x6d, 0x73, 0x3e, 0xa, 0x20, 0x3c, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x73, 0x74, 0x61, 0x74, 0x75, 0x73, 0x3e, 0xa, 0x20, 0x3c, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x3e, 0x32, 0x3c, 0x2f, 0x65, 0x72, 0x7 2, 0x6f, 0x72, 0x3e, 0xa, 0x20, 0x3c, 0x72, 0x65, 0x6d, 0x61, 0x72, 0x6b, 0x3e, 0x73, 0x69, 0x67, 0x6e, 0xe5, 0x8f, 0x82, 0xe6, 0x95, 0xb0, 0xe9, 0x94, 0x99, 0xe8, 0xaf, 0xaf, 0x3c, 0x2f, 0x72, 0x65, 0x6d, 0x61, 0x72, 0x6b, 0x3e, 0xa, 0x20, 0x3c , 0x2f, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x73, 0x74, 0x61, 0x74, 0x75, 0x73, 0x3e, 0xa, 0x20, 0x3c, 0x2f, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x73, 0x6d, 0x73, 0x3e, 0xa, 0x20}