CORS issue calling to railway from other domain

Question

Project ID : b1d6fa08-43ff-4114-82f0-f836e0ee2651

Hi, I'm getting this error when trying to call from my frontend to Flask backend server hosted on Railway: 
`
Access to fetch at 'http://c...pp/1980' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.
`

Here is my flask server looks like:

` ------------------ SETUP ------------------
load_dotenv()
app = Flask(__name__)
# this will need to be reconfigured before taking the app to production
cors = CORS(app, resources={r"/*": {"origins": ["http://localhost", "http://localhost:3000", "http://c...pp"]}})
...
# ------------------ START SERVER ------------------

if __name__ == '__main__':
    app.run(debug=True, port=os.getenv("PORT", default=5000))
`

Do you have any suggestion?
Anyway, thank you for building amazing railway!