docker-compose -f docker-compose.yml up
# pip3 freeze > requirements.txt # Python3
venv\scripts\activate
pip install -r requirements.txt
$env:FLASK_APP = "main"
flask run
cd web/client
npm install
npm run serve
https://github.com/miguelgrinberg/Flask-SocketIO/issues/457
https://github.com/miguelgrinberg/Flask-SocketIO/issues/279
https://github.com/miguelgrinberg/flack/blob/master/manage.py
docker build --tag flask_gunicorn_app .
docker run --detach -p 5000:5000 flask_gunicorn_app