Post Json in Golang

post_example.go

func createFriend() {
	requestURL := "http://rest.learncode.academy/api/johnbob/friends"
	payload := strings.NewReader("{\"FirstName\": \"Billy\"}")
	req, _ := http.NewRequest("POST", requestURL, payload)
	req.Header.Add("content-type", "application/json")
	res, err := http.DefaultClient.Do(req)

	if err != nil {
		panic(err)
	}

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))
}