* For example, during development, it could be `http://localhost:8000/docs/oauth2-redirect`.
    * Keep in mind that this callback URL is independent of whichever one is used by your frontend. You might also have another callback at `https://yourdomain.com/login/callback`.

Now use the parameter `callbacks` in *your API's path operation decorator* to pass the attribute `.routes` (that's actually just a `list` of routes/*path operations*) from that callback router:

```Python hl_lines="35"
{!../../../docs_src/openapi_callbacks/tutorial001.py!}
```

!!! tip

    - advanced/testing-events.md
    - advanced/testing-dependencies.md
    - advanced/testing-database.md
    - advanced/async-tests.md
    - advanced/settings.md
    - advanced/openapi-callbacks.md
    - advanced/openapi-webhooks.md
    - advanced/wsgi.md
    - advanced/generate-clients.md
  - fastapi-cli.md
  - Deployment:
    - deployment/index.md
    - deployment/versions.md