Minimal telegram bot that works on Heroku

minimal_bot.py

import os
import json
import telebot
from flask import Flask

ih = open("config.json", "r")
config = json.load(ih)
ih.close()

TOKEN = config["bot_token"]
URL = config["bot_url"]
bot = telebot.TeleBot(TOKEN)
server = Flask(__name__)

@server.route('/'+TOKEN, methods=['POST'])
def getMessage():
    bot.process_new_updates([telebot.types.Update.de_json(request.stream.read().decode("utf-8"))])
    return("!", 200)

@server.route("/")
def webhook():
    bot.remove_webhook()
    bot.set_webhook(url=URL+TOKEN)
    return("!", 200)
            
server.run(host='0.0.0.0', port=int(os.environ.get('PORT', 5000)))