Primero, tienes que importarlo:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}

/// warning | Advertencia

Fíjate que `Field` se importa directamente desde `pydantic`, no desde `fastapi` como el resto (`Query`, `Path`, `Body`, etc).

///

## Declarar atributos del modelo

Después puedes utilizar `Field` con los atributos del modelo:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[11:14] *}

/**
 */
// Just hide the one method we want behind the RepositorySystem interface.
@Deprecated
public interface ArtifactResolver {

    ArtifactResolutionResult resolve(ArtifactResolutionRequest request);

    // The rest is deprecated
    // USED BY MAVEN ASSEMBLY PLUGIN 2.2-beta-2
    @Deprecated
    String ROLE = ArtifactResolver.class.getName();

    // USED BY SUREFIRE, DEPENDENCY PLUGIN
    @Deprecated

import jakarta.validation.constraints.Size;

/**
 * Request body for plugin installation API.
 * This class represents the data structure for installing a plugin
 * through the admin REST API.
 */
public class InstallBody {
    /** Name of the plugin to install (required, max 100 characters) */
    @Required
    @Size(max = 100)
    public String name;

    /**
     * Default constructor.

---

The `APIRouter`s are not "mounted", they are not isolated from the rest of the application.

This is because we want to include their *path operations* in the OpenAPI schema and the user interfaces.

As we cannot just isolate them and "mount" them independently of the rest, the *path operations* are "cloned" (re-created), not included directly.

///

En utilisant seulement `BackgroundTasks` (et non `BackgroundTask`), il est possible de l'utiliser en tant que paramètre de *fonction de chemin* et de laisser **FastAPI** gérer le reste pour vous, comme en utilisant l'objet `Request` directement.

* Toma cada **request** que llega a tu aplicación.
* Puede entonces hacer algo a esa **request** o ejecutar cualquier código necesario.
* Luego pasa la **request** para que sea procesada por el resto de la aplicación (por alguna *path operation*).
* Después toma la **response** generada por la aplicación (por alguna *path operation*).
* Puede hacer algo a esa **response** o ejecutar cualquier código necesario.

* Sie nimmt jeden **Request** entgegen, der an Ihre Anwendung gesendet wird.
* Sie kann dann etwas mit diesem **Request** tun oder beliebigen Code ausführen.
* Dann gibt sie den **Request** zur Verarbeitung durch den Rest der Anwendung weiter (durch eine bestimmte *Pfadoperation*).
* Sie nimmt dann die **Response** entgegen, die von der Anwendung generiert wurde (durch eine bestimmte *Pfadoperation*).

            requirements**.txt
            pyproject.toml
      - name: Install docs extras
        run: uv pip install -r requirements-docs.txt
      # Install MkDocs Material Insiders here just to put it in the cache for the rest of the steps
      - name: Install Material for MkDocs Insiders
        if: ( github.event_name != 'pull_request' || github.secret_source == 'Actions' )
        run: uv pip install -r requirements-docs-insiders.txt
        env:

You can create production applications with **FastAPI** right now (and you have probably been doing it for some time), you just have to make sure that you use a version that works correctly with the rest of your code.

## Pin your `fastapi` version { #pin-your-fastapi-version }

* Ele pega cada **requisição** que chega ao seu aplicativo.
* Ele pode então fazer algo com essa **requisição** ou executar qualquer código necessário.
* Então ele passa a **requisição** para ser processada pelo resto do aplicativo (por alguma *operação de rota*).
* Ele então pega a **resposta** gerada pelo aplicativo (por alguma *operação de rota*).
* Ele pode fazer algo com essa **resposta** ou executar qualquer código necessário.