* `filename` - If set, this will be included in the response `Content-Disposition`.

File responses will include appropriate `Content-Length`, `Last-Modified` and `ETag` headers.

```Python hl_lines="2  10"
{!../../../docs_src/custom_response/tutorial009.py!}
```

You can also use the `response_class` parameter:

```Python hl_lines="2  8  10"