AWS example web server for learning

main.go

package main

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

var hostname string

func setHostName() {
	var err error
	hostname, err = os.Hostname()
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

func hostNameServer(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hello from %s!", hostname)
}

func main() {
	setHostName()
	http.HandleFunc("/", hostNameServer)
	http.ListenAndServe(":80", nil)
}