flask cookckies

from flask import Flask, render_template, make_response, request
id_list = [0]

@app.route('/')
def setcookie():
  resp = make_response(render_template('index.html'))
  resp.set_cookie('id', id_list[len(id_list) - 1] + 1)
  id_list.append(id_list[len(id_list) - 1] + 1)
  return resp

@app.route('/show_id')
def show_id():
  return f'<h1>welcome {request.cookies.get("id")} </h1>'

@app.route('/setcookie', methods = ['POST', 'GET'])def setcookie():   if request.method == 'POST':   user = request.form['nm']      resp = make_response(render_template('readcookie.html'))   resp.set_cookie('userID', user)      return resp