# How to force a file download with Nginx?

In short:

```nginx
add_header Content-Disposition 'attachment; filename="foo.txt"';
```
We’re just adding a `Content-Disposition` header in the response.
You can specify the file name, here we’re using `foo.txt`.

From there you can config the file name to be dynamic, using Nginx’s variables.
For instance using `$arg_filename`:

```nginx
add_header Content-Disposition 'attachment; filename="$arg_filename"';
```

You can now send a `GET` request with `?filename=hey.txt`, and the filename will be set to `hey.txt` as the download starts.