# Behind a Proxy

In some situations, you might need to use a **proxy** server like Traefik or Nginx with a configuration that adds an extra path prefix that is not seen by your application.

In these cases you can use `root_path` to configure your application.

The `root_path` is a mechanism provided by the ASGI specification (that FastAPI is built on, through Starlette).

The `root_path` is used to handle these specific cases.

```console
$ uvicorn main:app --root-path /api/v1

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

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Falls Sie Hypercorn verwenden, das hat auch die Option `--root-path`.

!!! note "Technische Details"
    Die ASGI-Spezifikation definiert einen `root_path` für diesen Anwendungsfall.

    Und die Kommandozeilenoption `--root-path` stellt diesen `root_path` bereit.