go http server

main.go

import (
  "os"
  "encoding/json"
  "log"
  "html/template"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
)
var (
	rtr         *mux.Router
	tmpl        *template.Template
)

func main() {
	
  tmpl, err = template.ParseGlob("html/templates/*")
	if err != nil {
		log.Fatal(err)
	}
  rtr = mux.NewRouter()
  rtr.PathPrefix("/js/").Handler(http.StripPrefix("/js/", http.FileServer(http.Dir("html/js"))))
  rtr.PathPrefix("/css/").Handler(http.StripPrefix("/css/", http.FileServer(http.Dir("html/css"))))
  rtr.PathPrefix("/images/").Handler(http.StripPrefix("/images/", http.FileServer(http.Dir("data/images"))))
  rtr.HandleFunc("/health", health)
  rtr.HandleFunc("/", index).Methods("GET")
	//****************** MUST BE END OF MAIN ******************\\
	s := &http.Server{
		Addr:           ":8080",
		Handler:        handlers.LoggingHandler(io.MultiWriter(os.Stdout), rtr),
		MaxHeaderBytes: 1 << 62,
	}
	err := s.ListenAndServe()
	if err != nil {
		log.Fatal("server failed", err)
	}
	//****************** MUST BE END OF MAIN ******************\\
}

func health(w http.ResponseWriter, r *http.Request) {
	status := struct {
		Status string
	}{
		"OK",
	}
	w.Header().Set("Content-Type", "application/json")
	j, _ := json.Marshal(status)
	w.Write(j)
}

func index(w http.ResponseWriter, r *http.Request) {
	tmpl.ExecuteTemplate(w, "index.html", nil)
}