http ResponseWriter重复答案golang

Question

func main() {

  http.HandleFunc("/", foo)

  http.ListenAndServe(":3000", nil)
}

func foo(w http.ResponseWriter, r *http.Request) {

  s:= "name"

  fp := path.Join("templates", "index.html")

  tmpl, err := template.ParseFiles(fp)
  if err != nil {
    panic(err)
  }

  if  err := tmpl.Execute(w, s); err != nil {
    panic(err)
  }

  fmt.Println("successfull Operation!!")

}

This code displays 2 "successfull Operation!!" but when I add /home (http.HandleFunc("/home", foo)), it doesn't. I want to know why it displays "successfull Operation!!" twice. Thank you in advance.

Answer 1

Because modern browsers send an extra request for /favicon.ico which is also handled in your / request handler.

If you ping your server with curl for example, you'll see only one request being sent:

 curl localhost:3000