Returning from Handler


i have HandlFunc: http.HandleFunc("/welcome", ValidateToken(Welcome))

func ValidateToken(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {

> func Welcome(w http.ResponseWriter, r *http.Request) {
> fmt.Println("welcoma page")
> w.Write([]byte("sads"))
> }

How can I return something from ValidateToken, so that will be able to use it in Welcome func?
I am validation something in ValidateToken and then I need this info also in Welcome function.

thank you.

You could use a global var or maybe a receiver…
Anothe roption is use the context package.

Take a look at 5 Useful Ways to Use Closures in Go. Specifically #3.

package main

import (

type Database struct {
  Url string

func NewDatabase(url string) Database {
  return Database{url}

func main() {
  db := NewDatabase("localhost:5432")

  http.HandleFunc("/hello", hello(db))
  http.ListenAndServe(":3000", nil)

func hello(db Database) func(http.ResponseWriter, *http.Request) {
  return func(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, db.Url)

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