go语言 w http.ResponseWriter怎么获取返回的状态码?

// query
func Query(w http.ResponseWriter, r *http.Request) {
    //模拟业务查询耗时0~1s
    fmt.Println(w.WriteHeader)
    time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
    _, _ = io.WriteString(w, "some results")
    
    //如果想要获取状态吗,怎么写?
}

求救