Go言語でWebServer

package main
import (
  "fmt"
  "net/http"
  )

func handler(w http.ResponseWriter, r *http.Request){
  fmt.Fprintf(w, "Hi %s!", r.URL.Path[1:])
}

func main(){
   http.HandleFunc("/", handler)
   http.ListenAndServe(":8080", nil)
}