func Example() {
	response := new(twiml.Response)
	response.Say(twiml.SayOpts{Voice: "alice"}, "My hands are typing words", "Haaaaaaaaaaaaands")
	output, _ := response.Render()
	fmt.Println(string(output))
	// Output:
	// <?xml version="1.0" encoding="UTF-8"?>
	//
	// <Response>
	// 	<Say voice="alice">My hands are typing words</Say>
	// 	<Say voice="alice">Haaaaaaaaaaaaands</Say>
	// </Response>
}
// To do dynamic responses, you can generate a twiml.Response inside a func
// and use it as an http.HandlerFunc.
func ExampleResponse_HandlerFunc() {
	handleCall := func(res http.ResponseWriter, req *http.Request) {
		twimlResp := new(twiml.Response)

		number := req.PostFormValue("From")
		twimlResp.Say(twiml.SayOpts{}, "Hello, you are calling from", number)

		output, err := twimlResp.Render()
		if err != nil {
			http.Error(res, err.Error(), http.StatusInternalServerError)
		}

		res.Write(output)
	}

	http.Handle("/callback/voice/", http.HandlerFunc(handleCall))
	http.ListenAndServe(":8080", nil)
}