But you can re-order them, and have the value without a default (the query parameter `q`) first.

It doesn't matter for **FastAPI**. It will detect the parameters by their names, types and default declarations (`Query`, `Path`, etc), it doesn't care about the order.

So, you can declare your function as:

=== "Python 3.8 non-Annotated"

    !!! tip

```console
$ pip install "hypercorn[trio]"
---> 100%
```

</div>

### Exécuter avec Trio

Ensuite, vous pouvez passer l'option de ligne de commande `--worker-class` avec la valeur `trio` :

<div class="termy">

```console
$ hypercorn main:app --worker-class trio
```

</div>

Et cela démarrera Hypercorn avec votre application en utilisant Trio comme backend.

You can have sub-dependencies and "trees" of sub-dependencies of any size and shape, and any or all of them can use `yield`.

**FastAPI** will make sure that the "exit code" in each dependency with `yield` is run in the correct order.

For example, `dependency_c` can have a dependency on `dependency_b`, and `dependency_b` on `dependency_a`:

=== "Python 3.9+"

    ```Python hl_lines="6  14  22"

* Ayrıca bu bir çok dilde kullanılabilecek **client code generator** kullanımına da izin veriyor.

### Otomatik dokümantasyon


OpenAPI standartlarına dayalı olan bir framework olarak, geliştiricilerin birden çok seçeneği var, varsayılan olarak gelen 2 farklı interaktif API dokümantasyonu ve web kullanıcı arayüzü var.

<abbr title="Bağımlılık enjeksiyonu: Dependency Injection">Bağımlılık enjeksiyonu</abbr> sistemi bağımlılıkların önceden kaydedilmesini ve sonrasında belirlenen veri tiplerine göre çözülmesini gerektiriyor. Yani spesifik bir tip, birden fazla bileşen ile belirlenemiyor.

`UploadFile` hat die folgenden `async`hronen Methoden. Sie alle rufen die entsprechenden Methoden des darunterliegenden Datei-Objekts auf (wobei intern `SpooledTemporaryFile` verwendet wird).

* `write(daten)`: Schreibt `daten` (`str` oder `bytes`) in die Datei.

{!../../../docs_src/cors/tutorial001.py!}
```

The default parameters used by the `CORSMiddleware` implementation are restrictive by default, so you'll need to explicitly enable particular origins, methods, or headers, in order for browsers to be permitted to use them in a Cross-Domain context.

The following arguments are supported:

```

`.add_task()` receives as arguments:

* A task function to be run in the background (`write_notification`).
* Any sequence of arguments that should be passed to the task function in order (`email`).
* Any keyword arguments that should be passed to the task function (`message="some notification"`).

## Dependency Injection

Of course, there are **special cases** where you could want to have **a container** with a **Gunicorn process manager** starting several **Uvicorn worker processes** inside.

Normalmente usas:

* `POST`: para crear datos.
* `GET`: para leer datos.
* `PUT`: para actualizar datos.
* `DELETE`: para borrar datos.

Así que en OpenAPI, cada uno de estos métodos de HTTP es referido como una "operación".

Nosotros también los llamaremos "**operación**".

#### Define un *decorador de operaciones de path*