Webhook Flask + Dispatcher

from flask import Flask, request
import logging
import Scraper
from credentials import bot_token, bot_user_name,URL
import telegram
from telegram.ext import Dispatcher, CommandHandler, MessageHandler, Filters


app = Flask(__name__)
application = app # hosting requires application in passenger_wsgi

TOKEN = bot_token
bot = telegram.Bot(token=TOKEN)

def start(bot, update): #Example of callback function for dispatcher when using flask to handle update
    update.message.reply_text('Hi!')

def chatid(bot, update): #Example of callback function for dispatcher when using flask to handle update
    update.message.reply_text('Chat id is {}'.format(update.message.chat_id))


#def start(update, context):
#    context.bot.send_message(chat_id=update.effective_chat.id, text="I'm a bot, please talk to me!")
#context cannot be used maybe because need to create updater with use_context=True. Flask is already handling update.
#have to use the above 2 callback functions if you are using flask to handle update
#The above callback function is shown in most example of the website.


def setup(token): #need to add this function if you are using flask to handle update
    # Create bot, update queue and dispatcher instances
    bot = telegram.Bot(token)
    dispatcher = Dispatcher(bot, None, workers=0)
    ##### Register handlers here #####
    start_handler = CommandHandler('start', start)
    dispatcher.add_handler(start_handler)
    dispatcher.add_handler(CommandHandler('chatid', chatid))
    return dispatcher

@app.route("/{}".format(TOKEN), methods=["POST","GET"])
def respond():
    if request.method == "GET":
        return "Working Webhook"
    else:
        try:
            dispatcher=setup(TOKEN) #need to add this line if you are using flask to handle update
            update = telegram.Update.de_json(request.get_json(force=True), bot)
            chat_id = update.message.chat.id
            msg_id = update.message.message_id
            text = update.message.text.encode("utf-8").decode()
            dispatcher.process_update(update) #need to add this line if you are using flask to handle update
            return Response('ok', status=200)
        finally:
            pass
            return "ok. Wrong Request or Error"

if __name__ == "__main__":
    app.run()