Setting a conversation cookie using Flask

app.py

from flask import Flask
from flask import session
from flask import make_response

from twilio import twiml

app = Flask(__name__)

@app.route('/tracking_conversation', methods=['POST'])
def tracking_conversation():
  twiml_response = twiml.Response()
  twiml_response.message("Hello world.")
  
  flask_response = make_response(str(response))
  flask_response.set_cookie('message_count', 1, expires=strftime('%a, %d %b %Y %H:%M:%S GMT')
  
  return flask_response