package main

import (
	"fmt"
	"log"
	"net/http"
)

func helloHandler(w http.ResponseWriter, r *http.Request) {
	_, err := fmt.Fprintf(w, "Hello, world!")
	if err != nil {
		log.Printf("write response error: %v", err)
		return
	}
}

func main() {
	http.HandleFunc("/", helloHandler)

	err := http.ListenAndServe(":8081", nil)

	if err != nil {
		log.Fatalf("server start failed: %v", err)
	}
}