## Self-hosting JavaScript and CSS for docs { #self-hosting-javascript-and-css-for-docs }

Self-hosting the JavaScript and CSS could be useful if, for example, you need your app to keep working even while offline, without open Internet access, or in a local network.

<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">CORS o "Cross-Origin Resource Sharing"</a> se refiere a situaciones en las que un frontend que se ejecuta en un navegador tiene código JavaScript que se comunica con un backend, y el backend está en un "origen" diferente al frontend.

## Origen

Die API-Dokumentation verwendet **Swagger UI** und **ReDoc**, und jede dieser Dokumentationen benötigt einige JavaScript- und CSS-Dateien.

        value = "http://www.seasar.org/hoge.html";
        assertTrue(htmlTransformer.isValidPath(value));

        value = "a javascript:...";
        assertTrue(htmlTransformer.isValidPath(value));

    }

    public void test_isValidPath_invalid() {
        String value;

        value = "javascript:...";
        assertFalse(htmlTransformer.isValidPath(value));

        value = "mailto:...";

	<script type="text/javascript" src="${fe:url('/js/jquery-3.7.1.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/clipboard.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/popper.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/bootstrap.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/suggestor.js')}"></script>

	<script type="text/javascript" src="${fe:url('/js/jquery-3.7.1.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/clipboard.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/popper.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/bootstrap.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/suggestor.js')}"></script>

Затем браузер отправит бэкенду HTTP-запрос `OPTIONS`, и если бэкенд вернёт соответствующие заголовки для авторизации взаимодействия с другим источником (`http://localhost:8080`), то браузер разрешит JavaScript-коду на фронтенде отправить запрос на этот бэкенд.

# Static Files - `StaticFiles`

You can use the `StaticFiles` class to serve static files, like JavaScript, CSS, images, etc.

Read more about it in the [FastAPI docs for Static Files](https://fastapi.tiangolo.com/tutorial/static-files/).

You can import it directly from `fastapi.staticfiles`:

```python
from fastapi.staticfiles import StaticFiles
```

	<script type="text/javascript" src="${fe:url('/js/jquery-3.7.1.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/popper.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/bootstrap.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/suggestor.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/advance.js')}"></script>
</body>

	</div>
	<input type="hidden" id="contextPath" value="${contextPath}" />
	<script type="text/javascript" src="${fe:url('/js/admin/jquery-3.7.1.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/admin/popper.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/admin/bootstrap.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/profile.js')}"></script>
</body>