./main.go:22: INDEX_HTML declared and not used

main.go

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
)

var INDEX_HTML []byte

func main() {
	fmt.Println("starting server on http://localhost:8080/")
	http.HandleFunc("/", IndexHandler)
	http.ListenAndServe(":8080", nil)
}

func IndexHandler(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte(INDEX_HTML))
}

func init() {
	INDEX_HTML, _ := ioutil.ReadFile("./tmpl/index.html")
}