Die Statuscodes im Bereich 400 bedeuten hingegen, dass es einen Fehler seitens des Clients gab.

Erinnern Sie sich an all diese **„404 Not Found“** Fehler (und Witze)?

## `HTTPException` verwenden { #use-httpexception }

# Зависимости с yield { #dependencies-with-yield }

FastAPI поддерживает зависимости, которые выполняют некоторые <abbr title='иногда также называемые "exit code", "cleanup code", "teardown code", "closing code", "context manager exit code" и т.п.'>дополнительные шаги после завершения</abbr>.

Для этого используйте `yield` вместо `return`, а дополнительные шаги (код) напишите после него.

/// tip | Подсказка

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 }

Versionen von Starlette enthielten eine `GraphQLApp`-Klasse zur Integration mit <a href="https://graphene-python.org/" class="external-link" target="_blank">Graphene</a>.

Das wurde von Starlette <abbr title="veraltet, obsolet: Es soll nicht mehr verwendet werden">deprecatet</abbr>, aber wenn Sie Code haben, der das verwendet, können Sie einfach zu <a href="https://github.com/ciscorn/starlette-graphene3" class="external-link" target="_blank">starlette-graphene3</a> **migrieren**, das denselben...

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.

All the same process that applied for path parameters also applies for query parameters:

* Editor support (obviously)
* Data <abbr title="converting the string that comes from an HTTP request into Python data">"parsing"</abbr>
* Data validation
* Automatic documentation

## Defaults { #defaults }

As query parameters are not a fixed part of a path, they can be optional and can have default values.

Para saber mais sobre cada código de status e qual código serve para quê, verifique a <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status" class="external-link" target="_blank">documentação do <abbr title="Mozilla Developer Network – Rede de Desenvolvedores da Mozilla">MDN</abbr> sobre códigos de status HTTP</a>.

///

## Atalho para lembrar os nomes { #shortcut-to-remember-the-names }

Vamos ver o exemplo anterior novamente:

    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`.