Serve the app with Gevent

def serve(config):
    "Serve the app with Gevent"
    from gevent.pywsgi import WSGIServer

    app = make_app(config=config)

    host = app.config.get("HOST", '127.0.0.1')
    port = app.config.get("PORT", 5000)
    http_server = WSGIServer((host, port), app)
    http_server.serve_forever()