backup.

Also, please note:
- using `application/vnd.kubernetes.protobuf` as the media storage type for 1.6 is default but not required
- the ability to rollback to etcd2 can be preserved by setting the storage media type flag on `kube-apiserver`

  ```
  --storage-media-type application/json
  ```

  to continue to use `application/json` as the storage media type which can be changed to

# Migrer de Pydantic v1 à Pydantic v2 { #migrate-from-pydantic-v1-to-pydantic-v2 }

Si vous avez une ancienne application FastAPI, vous utilisez peut-être Pydantic version 1.

FastAPI version 0.100.0 prenait en charge soit Pydantic v1 soit v2. Il utilisait celle que vous aviez installée.

FastAPI version 0.119.0 a introduit une prise en charge partielle de Pydantic v1 depuis l'intérieur de Pydantic v2 (comme `pydantic.v1`), pour faciliter la migration vers v2.

                                "content": {"application/json": {"schema": {}}},
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {
                                    "application/json": {
                                        "schema": {

            "content": {
                "application/json": {
                    "schema": {
                        "$ref": "#/components/schemas/Message"
                    }
                }
            }
        },
        "200": {
            "description": "Successful Response",
            "content": {
                "application/json": {
                    "schema": {

            "content": {
                "application/json": {
                    "schema": {
                        "$ref": "#/components/schemas/Message"
                    }
                }
            }
        },
        "200": {
            "description": "Successful Response",
            "content": {
                "application/json": {
                    "schema": {

                            "404": {
                                "description": "The item was not found",
                                "content": {
                                    "application/json": {
                                        "schema": {
                                            "$ref": "#/components/schemas/Message"
                                        }
                                    }

                                "description": "Return the JSON item or an image.",
                                "content": {
                                    "image/png": {},
                                    "application/json": {
                                        "schema": {"$ref": "#/components/schemas/Item"}
                                    },
                                },
                            },

                            "200": {
                                "content": {"application/json": {"schema": {}}},
                                "description": "Successful Response",
                            },
                            "422": {
                                "content": {
                                    "application/json": {
                                        "schema": {

    <td>GET /swagger.json</td>
    <td>GET /openapi/v2
Accept: application/json</td>
  </tr>
  <tr>
    <td>GET /swagger-2.0.0.pb-v1</td>
    <td>GET /openapi/v2
Accept: application/com.github.proto-openapi.spec.v2@v1.0+protobuf</td>
  </tr>
  <tr>
    <td>GET /swagger-2.0.0.pb-v1.gz</td>
    <td>GET /openapi/v2
Accept: application/com.github.proto-openapi.spec.v2@v1.0+protobuf Accept-Encoding: gzip</td>

## OpenAPI supplémentaire { #openapi-extra }

Lorsque vous déclarez un chemin d’accès dans votre application, **FastAPI** génère automatiquement les métadonnées pertinentes à propos de ce chemin d’accès à inclure dans le schéma OpenAPI.

/// note | Détails techniques