| `SESSION_STRING` (required) | String obtained by running `$ python3 app/generate_session_string.py`. (Login with the telegram account which is a participant of the given channel (or chat).
| `PORT` (optional) | Port on which app should listen to, defaults to 8080.
| `HOST` (optional) | Host name on which app should listen to, defaults to 0.0.0.0.
[](https://heroku.com/deploy?template=https://github.com/odysseusmax/tg-index/tree/master) [](https://repl.it/github/odysseusmax/tg-index)