`request_uri` isn't quite the same as Apache's `DOCUMENT_NAME`, and it'll bite you eventually:

- `DOCUMENT_NAME` (Apache) = just the filename, no path, no query string. e.g. `index.shtml`
- `$request_uri` (nginx) = the full original URI *including* query string, e.g. `/blog/post.html?utm_source=feed`

So it'll work fine until something hits a URL with a `?...` on it, or you reuse the include somewhere nested and want just the filename, not the whole path.

If you want a true filename-only equivalent, nginx doesn't expose one natively, but you can derive it with a `map`:

```nginx
map $document_uri $document_name {
    ~^.*/(?<name>[^/]+)$  $name;
    default               $document_uri;
}
```

Then in your SSI file:

```html
<!--#echo var="document_name" -->
```

That strips both the path and any query string, since it's built off `$document_uri` (path-only) rather than `$request_uri`.

If you only ever need the path without query args and don't care about stripping the directory, `$document_uri` alone (no map needed) is the closer one-to-one swap for `DOCUMENT_NAME`'s spirit then `$uri` works too, they're aliases in this context.