sejam enviados com o protocolo HTTP.

É uma prática comum ter um programa/servidor HTTP em execução no servidor (máquina, host, etc.) e gerenciar todas as partes HTTPS: enviando as solicitações HTTP descriptografadas para o aplicativo HTTP real em execução no mesmo servidor (a aplicação **FastAPI**, neste caso), pegue a resposta HTTP do aplicativo, criptografe-a usando o certificado apropriado e envie-a de volta ao cliente usando HTTPS. Este servidor é frequentemente chamado de <a href="...

## Separating tests

In a real application, you probably would have your tests in a different file.

And your **FastAPI** application might also be composed of several files/modules, etc.

### **FastAPI** app file

!!! info
    In this example we use invented custom headers `X-Key` and `X-Token`.

    But in real cases, when implementing security, you would get more benefits from using the integrated [Security utilities (the next chapter)](../security/index.md){.internal-link target=_blank}.

## Dependencies errors and return values

    If you integrate your API with an OAuth2 provider, you will be able to authenticate and come back to the API docs with the acquired credentials. And interact with it using the real OAuth2 authentication.

    Swagger UI will handle it behind the scenes for you, but it needs this "redirect" helper.

### Create a *path operation* to test it

    ```Python hl_lines="89-106"
    {!> ../../../docs_src/security/tutorial004.py!}
    ```

## Update the `/token` *path operation*

Create a `timedelta` with the expiration time of the token.

Create a real JWT access token and return it.

=== "Python 3.10+"

    ```Python hl_lines="117-132"
    {!> ../../../docs_src/security/tutorial004_an_py310.py!}
    ```

=== "Python 3.9+"

    {!> ../../../docs_src/bigger_applications/app/dependencies.py!}
    ```

!!! tip
    We are using an invented header to simplify this example.

    But in real cases you will get better results using the integrated [Security utilities](security/index.md){.internal-link target=_blank}.

## Another module with `APIRouter`

Ainda assim, a última experiência não foi a melhor.

---

Essa poderia ser a história paralela equivalente aos hambúrgueres.

Para um exemplo "mais real", imagine um banco.

Até recentemente, a maioria dos bancos tinha muitos caixas e uma grande fila.

Todos os caixas fazendo todo o trabalho, um cliente após o outro.

logo-teal-vector.svg...

    title: Microservice in Python using FastAPI
  - author: Guillermo Cruz
    author_link: https://wuilly.com/
    link: https://wuilly.com/2019/10/real-time-notifications-with-python-and-postgres/
    title: Real-time Notifications with Python and Postgres
  - author: Navule Pavan Kumar Rao
    author_link: https://www.linkedin.com/in/navule/

    hashed_password = hashed_password,
)
```

!!! warning
    The supporting additional functions are just to demo a possible flow of the data, but they of course are not providing any real security.

## Reduce duplication

Reducing code duplication is one of the core ideas in **FastAPI**.