You could do that with `openapi_extra`:

```Python hl_lines="20-37  39-40"
{!../../../docs_src/path_operation_advanced_configuration/tutorial006.py!}
```

Da die Ausführungszeit hier hauptsächlich durch das Warten auf <abbr title="Input and Output – Eingabe und Ausgabe">I/O</abbr>-Operationen verbraucht wird, nennt man dies auch „I/O-lastige“ („I/O bound“) Operationen.

    would be valid to use as a **FastAPI** dependency.

    In fact, FastAPI uses those two decorators internally.

## A database dependency with `yield`

For example, you could use this to create a database session and close it after finishing.

        default_value = value if value is not inspect.Signature.empty else Required
        if is_path_param:
            # We might check here that `default_value is Required`, but the fact is that the same
            # parameter might sometimes be a path parameter and sometimes not. See
            # `tests/test_infer_param_optionality.py` for an example.

=== "Python 3.8+"

    ```Python
    {!> ../../../docs_src/sql_databases/sql_app/main.py!}
    ```

## Check it

You can copy this code and use it as is.

!!! info

    In fact, the code shown here is part of the tests. As most of the code in these docs.

Then you can run it with Uvicorn:


<div class="termy">

```console
$ uvicorn sql_app.main:app --reload

```

#### Hinter einem TLS-Terminierungsproxy

Wenn Sie Ihren Container hinter einem TLS-Terminierungsproxy (Load Balancer) wie Nginx oder Traefik ausführen, fügen Sie die Option `--proxy-headers` hinzu. Das sagt Uvicorn, den von diesem Proxy gesendeten Headern zu vertrauen und dass die Anwendung hinter HTTPS ausgeführt wird, usw.

```Dockerfile
CMD ["uvicorn", "app.main:app", "--proxy-headers", "--host", "0.0.0.0", "--port", "80"]
```

And the **container** itself (in contrast to the **container image**) is the actual running instance of the image, comparable to a **process**. In fact, a container is running only when it has a **process running** (and normally it's only a single process). The container stops when there's no process running in it.

## Container Images