callbackRemove()\n      }\n    } else if (callback) {\n      callback()\n    }\n  }\n\n  // ----------------------------------------------------------------------\n  // the following methods are used to handle overflowing modals\n  // todo (fat): these should probably be refactored out of modal.js\n  // ----------------------------------------------------------------------\n\n  _adjustDialog() {\n    const isModalOverflowing = this._element.scrollHeight > document.documentElement.clientHeight\n\n    if (!this._isBodyOverflowing...

* [Breaking change, client-go]: The WaitFor function returns, probably an ErrWaitTimeout, when the done channel is closed, even if the `WaitFunc` doesn't handle the done channel. ([#72364](https://github.com/kubernetes/kubernetes/pull/72364), [@kdada](https://github.com/kdada))

            the first batch we "peek" from the generator. This used to happen
            implicitly in `Model._standardize_user_data`. Long-term, a solution
            where the `DataAdapter` doesn't need to call the Model is probably
            preferable.
    *   The SavedModel format now supports all Keras built-in layers (including
        metrics, preprocessing layers, and stateful RNN layers)

- A small regression in Service updates was fixed. The circumstances are so unlikely that probably nobody would ever hit it. ([#104601](https://github.com/kubernetes/kubernetes/pull/104601), [@thockin](https://github.com/thockin))

- Recording timing traces had a race condition. Impact in practice was probably low. ([#117139](https://github.com/kubernetes/kubernetes/pull/117139), [@pohly](https://github.com/pohly)) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node and Storage]

        .Builder()
        .trustMockServer()
        .dispatcher(Dispatcher(newVirtualThreadPerTaskExecutor()))
        .build()

    executor = newVirtualThreadPerTaskExecutor()

    // Capture non-deterministic but probable sysout warnings of pinned threads
    // https://docs.oracle.com/en/java/javase/21/core/virtual-threads.html
    System.setOut(PrintStream(capturedOut))
  }

  @AfterEach
  fun checkForPinning() {

You can also return Pydantic models (you'll see more about that later).

There are many other objects and models that will be automatically converted to JSON (including ORMs, etc). Try using your favorite ones, it's highly probable that they are already supported.

## Recap { #recap }

* Import `FastAPI`.
* Create an `app` instance.
* Write a **path operation decorator** using decorators like `@app.get("/")`.

{* ../../docs_src/websockets/tutorial003_py39.py hl[79:81] *}

Para probarlo:

* Abre la aplicación con varias pestañas del navegador.
* Escribe mensajes desde ellas.
* Luego cierra una de las pestañas.

Swagger UI lo manejará detrás de escena para ti, pero necesita este auxiliar de "redirección".

///

### Crea una *path operation* para probarlo

Ahora, para poder probar que todo funciona, crea una *path operation*:

{* ../../docs_src/custom_docs_ui/tutorial001.py hl[36:38] *}

### Pruébalo

Vous pouvez aussi retourner des models **Pydantic** (qui seront détaillés plus tard).

Il y a de nombreux autres objets et modèles qui seront automatiquement convertis en JSON. Essayez d'utiliser vos favoris, il est fort probable qu'ils soient déjà supportés.

## Récapitulatif

* Importez `FastAPI`.
* Créez une instance d'`app`.
* Ajoutez une **décorateur d'opération de chemin** (tel que `@app.get("/")`).