And it will save the returned value in a <abbr title="A utility/system to store computed/generated values, to reuse them instead of computing them again.">"cache"</abbr> and pass it to all the "dependants" that need it in that specific request, instead of calling the dependency multiple times for the same request.

Standardmäßig werden diese Dateien von einem <abbr title="Content Delivery Network – Inhalte auslieferndes Netzwerk: Ein Dienst, der normalerweise aus mehreren Servern besteht und statische Dateien wie JavaScript und CSS bereitstellt. Er wird häufig verwendet, um diese Dateien vom Server bereitzustellen, der näher am Client liegt, wodurch die Leistung verbessert wird.">CDN</abbr> bereitgestellt.

By default, those files are served from a <abbr title="Content Delivery Network: A service, normally composed of several servers, that provides static files, like JavaScript and CSS. It's commonly used to serve those files from the server closer to the client, improving performance.">CDN</abbr>.

But it's possible to customize it, you can set a specific CDN, or serve the files yourself.

It was created to generate the HTML in the backend, not to create APIs used by a modern frontend (like React, Vue.js and Angular) or by other systems (like <abbr title="Internet of Things">IoT</abbr> devices) communicating with it.

### <a href="https://www.django-rest-framework.org/" class="external-link" target="_blank">Django REST Framework</a> { #django-rest-framework }

     * by Source Code Management (<abbr>SCM</abbr>) software or by the operating system.
     * Examples: <code>"**&sol;.gitignore"</code>, <code>"**&sol;.DS_Store"</code>.</p>
     *
     * @param defaultIncludes the default includes if unspecified by the user
     * @param useDefaultExcludes whether to add the default set of patterns to exclude,
     *        mostly Source Code Management (<abbr>SCM</abbr>) files
     */

    Neste caso, é uma lista de dataclasses `Item`.

6. Aqui estamos retornando um dicionário que contém `items`, que é uma lista de dataclasses.

    O FastAPI ainda é capaz de <abbr title="converter os dados para um formato que pode ser transmitido">serializar</abbr> os dados para JSON.

7. Aqui o `response_model` está usando uma anotação de tipo de uma lista de dataclasses `Author`.

/// tip

To know more about each status code and which code is for what, check the <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status" class="external-link" target="_blank"><abbr title="Mozilla Developer Network">MDN</abbr> documentation about HTTP status codes</a>.

///

## Shortcut to remember the names { #shortcut-to-remember-the-names }

Let's see the previous example again:

    En este caso, es una lista de dataclasses `Item`.

6. Aquí estamos regresando un diccionario que contiene `items`, que es una lista de dataclasses.

    FastAPI todavía es capaz de <abbr title="convertir los datos a un formato que pueda transmitirse">serializar</abbr> los datos a JSON.

7. Aquí el `response_model` está usando una anotación de tipo de una lista de dataclasses `Author`.

## Agregando middlewares ASGI { #adding-asgi-middlewares }

Como **FastAPI** está basado en Starlette e implementa la especificación <abbr title="Asynchronous Server Gateway Interface – Interfaz de puerta de enlace de servidor asíncrona">ASGI</abbr>, puedes usar cualquier middleware ASGI.

Un middleware no tiene que estar hecho para FastAPI o Starlette para funcionar, siempre que siga la especificación ASGI.

По умолчанию эти файлы отдаются с <abbr title="Content Delivery Network – Сеть доставки контента: Сервис, обычно состоящий из нескольких серверов, который предоставляет статические файлы, такие как JavaScript и CSS. Обычно используется, чтобы отдавать эти файлы с сервера, расположенного ближе к клиенту, что улучшает производительность.">CDN</abbr>.