Sometimes you need not just webhooks from telegram, but from other services too. It would be nice if we could integrate this nicely into the library, without forcing users to not use Updater (which means handling threading, jobqueue starting, and of cause webhooks themselves).

As this is still very much an advanced feature, I think a good way of doing this could be to allow passing a custom WebhookAppClass to Updater._start_webhook somehow.

For example to also receive webhooks from github one could write a custom GithubWebhookHandler (instance of tornado.web.RequestHandler that perhaps turns incomming data into a GithubUpdate type that a TypeHandler can then handle) and then a WebhookAppClass like:

class WebhookAppClass(tornado.web.Application):
    def __init__(self, webhook_path, bot, update_queue):
        handlers = [
            (
                r'/github/?',
                GithubWebhookHandler,
                {'update_queue': update_queue}
            ),
            (
                r"{0}/?".format(webhook_path),
                telegram.utils.webhookhandler.WebhookHandler,
                {'bot': bot, 'update_queue': update_queue}
            )
        ]
        super().__init__(handlers)

The only way this is currently possible to do is something like

telegram.utils.webhookhandler.WebhookAppClass = WebhookAppClass

But as that line needs to come before any telegram imports, it makes it quite messy.