Gevent con frasco
# flask_app/pywsgi.py
from gevent import monkey
monkey.patch_all()
import os
from gevent.pywsgi import WSGIServer
from app import app
http_server = WSGIServer(('0.0.0.0', int(os.environ['PORT_APP'])), app)
http_server.serve_forever()
Prickly Peacock