First install <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>.

    E.g. `pip install python-multipart`.

    This is because **OAuth2** uses "form data" for sending the `username` and `password`.

Run the example with:

<div class="termy">

```console
$ uvicorn main:app --reload