cook.go

package main

import (
  "net/http"
  "strings"
  "time"
)

func handler(w http.ResponseWriter, r *http.Request) {

  token := r.FormValue("token")

  expire := time.Now().AddDate(0, 0, 1)
  cookie := http.Cookie{
    Name:     "user-id",
    Value:    token,
    Path:     "/",
    Domain:   strings.Split(r.Host, ":")[0],
    Expires:  expire,
    MaxAge:   86400,
    Secure:   true,
    HttpOnly: true,
  }
  http.SetCookie(w, &cookie)
  http.Redirect(w, r, "Temporary redirect", http.StatusTemporaryRedirect)
}

func main() {
  http.HandleFunc("/auth", handler)
  http.ListenAndServe(":8085", nil)
}