package main import ( "fmt" "github.com/gorilla/mux" "log" "net/http" ) func main() { r := mux.NewRouter() r.HandleFunc("/", Hello) http.Handle("/", r) log.Fatal(http.ListenAndServe(":8081", nil)) } func Hello(w http.ResponseWriter, req *http.Request) { fmt.Fprintln(w, "Hello world!") }