为啥初始化没有设置默认属性这些功能呢？ about req HOT 1 CLOSED

package main

import (
	"github.com/imroc/req"
	"net/http"
)

type Client struct{
	*req.Req
	defaultHeaders http.Header
}

func NewClient(headers http.Header) *Client {
	return &Client{
		Req: req.New(),
		defaultHeaders: headers,
	}
}

func main() {
	defaultHeader := make(http.Header)
	defaultHeader .Set("APPID", "xxxx")
	c := NewClient(defaultHeader)
	res, _ := c.Get("http://xxx.com/users")
        ...
}