Just functions that look the same as the *path operation functions*.

But still, it is very powerful, and allows you to declare arbitrarily deeply nested dependency "graphs" (trees).

/// tip

All this might not seem as useful with these simple examples.

But you will see how useful it is in the chapters about **security**.

    * FastAPI ofrece más funcionalidades además de las de Starlette. Funcionalidades que casi siempre necesitas al construir APIs, como la validación y serialización de datos. Y al utilizarlo, obtienes documentación automática gratis (la documentación automática ni siquiera añade carga a las aplicaciones en ejecución, se genera al inicio).

behalf of whom a Contribution has been received by Licensor and subsequently 
incorporated within the Work. 

2. Grant of Copyright License. Subject to the terms and conditions of this 
License, each Contributor hereby grants to You a perpetual, worldwide, 
non-exclusive, no-charge, royalty-free, irrevocable copyright license to 
reproduce, prepare Derivative Works of, publicly display, publicly perform, 

 *
 * <h3>Additional documentation</h3>
 *
 * <p>See the Guava User Guide for the {@code common.graph} package (<a
 * href="https://github.com/google/guava/wiki/GraphsExplained">"Graphs Explained"</a>) for
 * additional documentation, including <a
 * href="https://github.com/google/guava/wiki/GraphsExplained#notes-for-implementors">notes for
 * implementors</a>
 *
 * @author Joshua O'Madadhain

{* ../../docs_src/dataclasses_/tutorial001_py310.py hl[1,6:11,18:19] *}

Isso ainda é suportado graças ao **Pydantic**, pois ele tem <a href="https://docs.pydantic.dev/latest/concepts/dataclasses/#use-of-stdlib-dataclasses-with-basemodel" class="external-link" target="_blank">suporte interno para `dataclasses`</a>.

* Técnicas mais avançadas (mas igualmente fáceis) para declaração de **modelos JSON profundamente aninhados** (graças ao Pydantic).
* Integrações **GraphQL** com o <a href="https://strawberry.rocks" class="external-link" target="_blank">Strawberry</a> e outras bibliotecas.
* Muitos recursos extras (graças ao Starlette) como:
    * **WebSockets**
    * testes extrememamente fáceis baseados em HTTPX e `pytest`
    * **CORS**

      subsequently incorporated within the Work.

   2. Grant of Copyright License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      copyright license to reproduce, prepare Derivative Works of,
      publicly display, publicly perform, sublicense, and distribute the

      subsequently incorporated within the Work.

   2. Grant of Copyright License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      copyright license to reproduce, prepare Derivative Works of,
      publicly display, publicly perform, sublicense, and distribute the

      subsequently incorporated within the Work.

   2. Grant of Copyright License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      copyright license to reproduce, prepare Derivative Works of,
      publicly display, publicly perform, sublicense, and distribute the

      subsequently incorporated within the Work.

   2. Grant of Copyright License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      copyright license to reproduce, prepare Derivative Works of,
      publicly display, publicly perform, sublicense, and distribute the