I have a Flask application that won't run when gevent is installed.
Here is my app.py file:
from app import create_app, socketio
app = create_app()
if __name__ == '__main__':
socketio.run(app)
init.py (with create_app)
from flask_socketio import SocketIO
...
socketio = SocketIO()
def create_app(config_class=Config):
app = Flask(__name__)
app.config.from_object(Config)
socketio.init_app(app, cors_allowed_origins='*')
...
return app
When I run python app.py, this is what shows in terminal:
* Restarting with stat
* Debugger is active!
* Debugger PIN: 189-464-699
With this running, my application (localhost:5000/) will not load any page- it just says Internal Server Error, even if it's not a page that uses websocket. I don't see any requests in terminal as I usually would.
What I expect when I run python app.py
* Serving Flask app "app" (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: on
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
* Restarting with stat
* Debugger is active!
* Debugger PIN: 335-570-116
and of course I expect to be able to load site pages.
If I uninstall gevent, I can get the expected behavior, however, I get this error:
WebSocket transport not available. Install simple-websocket for improved performance.
simple-websocket is already installed. I took this error to mean I should install gevent and gevent-websocket.
With gevent uninstalled, I can load pages, but I receive the above transport not available error in the terminal, and the site pages that use websockets have this error in the debugger: VM78:1 GET http://localhost:5000/socket.io/?EIO=4&transport=polling&t=Ne0kF52 net::ERR_CONNECTION_REFUSED