* **Modify some DNS records**.
    * For this, the renewal program needs to support the APIs of the DNS provider, so, depending on the DNS provider you are using, this might or might not be an option.
* **Run as a server** (at least during the certificate acquisition process) on the public IP address associated with the domain.
    * As we said above, only one process can be listening on a specific IP and port.

Allgemeine Validierungen und Metadaten:

* `alias`
* `title`
* `description`
* `deprecated`

Validierungen spezifisch für Strings:

* `min_length`
* `max_length`
* `pattern`

In diesen Beispielen haben Sie gesehen, wie Sie Validierungen für Strings hinzufügen.

![Swagger UI Interaktion](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* Alternative API-Dokumentation mit <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank"><strong>ReDoc</strong></a>.

# Yol Parametreleri

Yol "parametrelerini" veya "değişkenlerini" Python <abbr title="String Biçimleme: Format String">string biçimlemede</abbr> kullanılan sözdizimi ile tanımlayabilirsiniz.

```Python hl_lines="6-7"
{!../../../docs_src/path_params/tutorial001.py!}
```

Yol parametresi olan `item_id`'nin değeri, fonksiyonunuza `item_id` argümanı olarak aktarılacaktır.

```JSON
{"item_id":3}
```

!!! check "Revisa"
    Observa que el valor que recibió (y devolvió) tu función es `3`, como un Python `int`, y no un string `"3"`.

    Entonces, con esa declaración de tipos **FastAPI** te da <abbr title="convertir el string que viene de un HTTP request a datos de Python">"parsing"</abbr> automático del request.

## Validación de datos

```JSON
{"item_id":3}
```

!!! check "Verifique"
	Observe que o valor recebido pela função (e também retornado por ela) é `3`, como um Python `int`, não como uma string `"3"`.

	Então, com essa declaração de tipo, o **FastAPI** dá pra você um <abbr title="convertendo a string que veio do request HTTP em um dado Python">"parsing"</abbr> automático no request .

## Validação de dados

Der Name des Formularfelds lautet `scope` (im Singular), tatsächlich handelt es sich jedoch um einen langen String mit durch Leerzeichen getrennten „Scopes“.

Jeder „Scope“ ist nur ein String (ohne Leerzeichen).

Diese werden normalerweise verwendet, um bestimmte Sicherheitsberechtigungen zu deklarieren, zum Beispiel:

* `users:read` oder `users:write` sind gängige Beispiele.

### `scope`

The spec also says that the client can send another form field "`scope`".

The form field name is `scope` (in singular), but it is actually a long string with "scopes" separated by spaces.

Each "scope" is just a string (without spaces).

They are normally used to declare specific security permissions, for example:

* `users:read` or `users:write` are common examples.

It doesn't return a large `str` containing the data in JSON format (as a string). It returns a Python standard data structure (e.g. a `dict`) with values and sub-values that are all compatible with JSON.

!!! note

Wir erstellen eine `HTTPException`, die wir später an mehreren Stellen wiederverwenden (`raise`n) können.