handler.go

func main() {
	listenAddr := ":8080"
	if val, ok := os.LookupEnv("FUNCTIONS_CUSTOMHANDLER_PORT"); ok {
		listenAddr = ":" + val
	}
	http.HandleFunc("/api/hello", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("Hello."))
	})
	log.Printf("About to listen on %s. Go to https://127.0.0.1%s/", listenAddr, listenAddr)
	log.Fatal(http.ListenAndServe(listenAddr, nil))
}