---

Again, these are very technical details that would probably be useful if you came searching for them.

!!! note "Technical Details"
    `threading.local` is used to have a "magic" variable that has a different value for each thread.

    This was useful in older frameworks designed to have one single thread per request, no more, no less.

    Using this, each request would have its own database connection/session, which is the actual final goal.

* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.
    * If it is not, the client will see a useful, clear error.
* Check if there is an optional query parameter named `q` (as in `http://127.0.0.1:8000/items/foo?q=somequery`) for `GET` requests.
    * As the `q` parameter is declared with `= None`, it is optional.

There is an official Docker image that includes Gunicorn running with Uvicorn workers, as detailed in a previous chapter: [Server Workers - Gunicorn with Uvicorn](server-workers.md){.internal-link target=_blank}.

This image would be useful mainly in the situations described above in: [Containers with Multiple Processes and Special Cases](#containers-with-multiple-processes-and-special-cases).

* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.
    * If it is not, the client will see a useful, clear error.
* Check if there is an optional query parameter named `q` (as in `http://127.0.0.1:8000/items/foo?q=somequery`) for `GET` requests.
    * As the `q` parameter is declared with `= None`, it is optional.

```
docs/en/docs/features.md
```

* Collez-le exactement au même endroit mais pour la langue que vous voulez traduire, par exemple :

```
docs/es/docs/features.md
```

!!! tip
    Notez que le seul changement dans le chemin et le nom du fichier est le code de langue, qui passe de `en` à `es`.

* Ouvrez maintenant le fichier de configuration de MkDocs pour l'anglais à

```
docs/en/docs/mkdocs.yml
```

Ce qu'il faut retenir c'est qu'en utilisant les types standard de Python, à un seul endroit (plutôt que d'ajouter plus de classes, de décorateurs, etc.), **FastAPI** fera une grande partie du travail pour vous.

!!! info

Les routes sont déclarées à un seul endroit, en utilisant des fonctions déclarées à d'autres endroits (au lieu
d'utiliser des décorateurs qui peuvent être placés juste au-dessus de la fonction qui gère l'endpoint). Cette