* Это также будет использовано инструментами автоматической генерации клиентского кода.
* **Сериализовать** возвращаемые данные в JSON с помощью Pydantic, который написан на **Rust**, поэтому это будет **намного быстрее**.

Но самое главное:

* Выходные данные будут **ограничены и отфильтрованы** в соответствии с тем, что определено в возвращаемом типе.

minio/minio ``` ### Installing certificates from third party CAs MinIO can connect to other servers, including MinIO nodes or other server types such as NATs and Redis. If these servers use certificates that were not registered with a known CA, add trust for these certificates to MinIO Server by bundling these certificates into a Kubernetes secret and providing it to Helm via the `trustedCertsSecret` value. If `.Values.tls.enabled` is `true` and you're installing certificates for third party CAs, remember...

E, por baixo dos panos, o Pydantic usa os mesmos mecanismos em Rust que o `orjson` para serializar para JSON, então você já terá a melhor performance com um modelo de resposta.

## Classe de resposta padrão { #default-response-class }

        # What calls this code passes a value that already called
        # self._type_adapter.validate_python(value)
        # This uses Pydantic's dump_json() which serializes directly to JSON
        # bytes in one pass (via Rust), avoiding the intermediate Python dict
        # step of dump_python(mode="json") + json.dumps().
        return self._type_adapter.dump_json(
            value,
            include=include,
            exclude=exclude,

    * Esto será utilizado por la **documentación automática**.
    * También será utilizado por herramientas de generación automática de código de cliente.
* **Serializar** los datos devueltos a JSON usando Pydantic, que está escrito en **Rust**, por lo que será **mucho más rápido**.

Pero lo más importante:

* **Limitará y filtrará** los datos de salida a lo que se define en el tipo de retorno.

minio/minio ``` ### Installing certificates from third party CAs MinIO can connect to other servers, including MinIO nodes or other server types such as NATs and Redis. If these servers use certificates that were not registered with a known CA, add trust for these certificates to MinIO Server by bundling these certificates into a Kubernetes secret and providing it to Helm via the `trustedCertsSecret` value. If `.Values.tls.enabled` is `true` and you're installing certificates for third party CAs, remember...

minio/minio ``` ### Installing certificates from third party CAs MinIO can connect to other servers, including MinIO nodes or other server types such as NATs and Redis. If these servers use certificates that were not registered with a known CA, add trust for these certificates to MinIO Server by bundling these certificates into a Kubernetes secret and providing it to Helm via the `trustedCertsSecret` value. If `.Values.tls.enabled` is `true` and you're installing certificates for third party CAs, remember...

    * Bu, **otomatik dokümantasyon** tarafından kullanılır.
    * Ayrıca otomatik client code generation araçları tarafından da kullanılır.
* Dönen veriyi Pydantic kullanarak JSON’a **serileştirmek**; Pydantic **Rust** ile yazıldığı için **çok daha hızlıdır**.

Ama en önemlisi:

* Çıktı verisini, dönüş tipinde tanımlı olana göre **sınırlar ve filtreler**.

レスポンスモデルがあると、FastAPI は中間ステップ（他の場合に行われる `jsonable_encoder` による変換など）を介さずに、Pydantic を使ってデータをJSONにシリアライズします。

内部的には、Pydantic はJSONシリアライズに `orjson` と同じRust由来の仕組みを用いているため、レスポンスモデルを使うだけで最良のパフォーマンスが得られます。

## デフォルトレスポンスクラス { #default-response-class }

**FastAPI** クラスのインスタンスや `APIRouter` を作成する際に、デフォルトで使用するレスポンスクラスを指定できます。

これを定義するパラメータは `default_response_class` です。

    * Dieses wird von der **automatischen Dokumentation** verwendet.
    * Es wird auch von automatisch Client-Code-generierenden Tools verwendet.
* Die zurückgegebenen Daten mit Pydantic zu **serialisieren** (zu JSON). Pydantic ist in **Rust** geschrieben und daher **viel schneller**.

Aber am wichtigsten:

* Es wird die Ausgabedaten auf das **limitieren und filtern**, was im Rückgabetyp definiert ist.