python3 flask-restful issue

main.py

from flask import Flask
from flask_restful import Resource, Api
from flask_cors import CORS

app = Flask(__name__)
api = Api(app)
CORS(app)
    def get(self):
        args = request.args
        try:
            channel_name = args['channel_name']
            socket_id = args['socket_id']
            username = args['username']
            custom = {
                'user_id': '%d' % random.randint(100, 999),
                'user_info': { 'username': username}
            }

            auth = self.pusher.authenticate(
                channel=channel_name,
                socket_id=socket_id,
                custom_data=custom
            )
            return json.dumps(auth)
        except ValueError as error:
            print(error)


# add auth
api.add_resource(Auth, '/pusher/auth')

pusherService.ts

import Pusher from 'pusher-js';

export default class pusherService { 

    public static connect(username: string) { 
        Pusher.logToConsole = true;
        const key: string = '4de2f58b95c9bda94f4f';
        const cluster: string = 'ap1';
        const forceTLS: boolean = true;
        
        let _pusher = new Pusher(key, {
            authTransport: 'jsonp',
            authEndpoint: 'https://2ec71c69.ngrok.io/pusher/auth',
            cluster: cluster,
            encrypted: false,
            auth: {
                params: { username: username }
            },
            forceTLS: forceTLS
        });

        _pusher.connection.bind('state_change', (states: any) => console.log('pusher is :', states.current))

        let channel = _pusher.subscribe('private-10-lobby');

        channel.bind('pusher:subscription_success', () => {
            console.log('subscription succeeded');
        })
        channel.bind('pusher:subscription_error', (status: any) => {
            console.log('some error happened', status);
        })

        // listen to event on debug when subscription succeeded
        channel.bind('my-event', (msg: any) => {
            console.log(msg, 'wahehe');
        })
        return _pusher;
    }
}