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This is a very beginner level mistake I would say please check your CORS origin list carefully.

Make sure your frontend and backend domain matches properly, for example http://localhost:9000 and http:127.0.0.1:9000 is not same according to the cors origin list. Also there should be no slash at the end of your domain.

origins = [
    "http://localhost:3000",  # React frontend
    "http://127.0.0.1:3000"
]

For safety reason do something like this ->

origins = [
    "http://localhost",  # React frontend
    "http://127.0.0.1",  # React frontend
    "http://localhost:3000", # React frontend
    "http://127.0.0.1:3000"  # React frontend
]

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