http_redirect_with_headers.go

package main

import (
	"io"
	"log"
	"net/http"
)

func main() {
	rootHandler := func(w http.ResponseWriter, req *http.Request) {
		w.Header().Set("Location", "http://localhost:8080/hello")
		cookie := http.Cookie{
			Name:     "auth-token",
			Value:    "I love you",
			MaxAge:   0,
			Secure:   false,
			HttpOnly: false,
			SameSite: http.SameSiteDefaultMode,
		}
		http.SetCookie(w, &cookie)
		w.WriteHeader(http.StatusTemporaryRedirect)
	}
	http.HandleFunc("/", rootHandler)

	helloHandler := func(w http.ResponseWriter, req *http.Request) {
		io.WriteString(w, "Hello, world!\n")
	}
	http.HandleFunc("/hello", helloHandler)

	log.Fatal(http.ListenAndServe(":8080", nil))
}