* For `PUT` requests to `/items/{item_id}`, read the body as JSON:
    * Check that it has a required attribute `name` that should be a `str`.
    * Check that it has a required attribute `price` that has to be a `float`.
    * Check that it has an optional attribute `is_offer`, that should be a `bool`, if present.
    * All this would also work for deeply nested JSON objects.
* Convert from and to JSON automatically.

It can't handle nested models very well. So, if the JSON body in the request is a JSON object that has inner fields that in turn are nested JSON objects, it cannot be properly documented and validated.

/// check | Inspired **FastAPI** to

Use Python types to have great editor support.

    response = client.get("/docs/oauth2-redirect")
    assert response.status_code == 404, response.text


def test_response():
    response = client.get("/items/")

* <a href="http://json-schema.org/" class="external-link" target="_blank"><strong>JSONスキーマ</strong></a>を使用したデータモデルのドキュメント自動生成（OpenAPIはJSONスキーマに基づいている）。
* 綿密な調査の結果、上層に後付けするのではなく、これらの基準に基づいて設計されました。
* これにより、多くの言語で自動 **クライアントコード生成** が可能です。

### 自動ドキュメント生成

    return mod.app


def test_settings(app):
    client = TestClient(app)
    response = client.get("/info")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "app_name": "Awesome API",
        "admin_email": "******@****.***",
        "items_per_user": 50,

type Metrics struct {
	ReqOK   uint64                   `json:"kms_req_success"` // Number of requests that succeeded
	ReqErr  uint64                   `json:"kms_req_error"`   // Number of requests that failed with a defined error
	ReqFail uint64                   `json:"kms_req_failure"` // Number of requests that failed with an undefined error
	Latency map[time.Duration]uint64 `json:"kms_resp_time"`   // Latency histogram of all requests
}

 - [Git](https://github.com/codelibs/fess-ds-git)
 - [Gitbucket](https://github.com/codelibs/fess-ds-gitbucket)
 - [G Suite](https://github.com/codelibs/fess-ds-gsuite)
 - [JSON](https://github.com/codelibs/fess-ds-json)
 - [Office 365](https://github.com/codelibs/fess-ds-office365)
 - [S3](https://github.com/codelibs/fess-ds-s3)
 - [Salesforce](https://github.com/codelibs/fess-ds-salesforce)

        result.setMimeType("text/html");
        assertEquals("text/html", result.getMimeType());

        result.setMimeType("application/json");
        assertEquals("application/json", result.getMimeType());
    }

    public void test_createTimeGetterSetter() {
        // Test create time getter/setter
        AccessResultImpl<Long> result = new AccessResultImpl<>();

const etcdPathSeparator = "/"

// create a new coredns service record for the bucket.
func newCoreDNSMsg(ip string, port string, ttl uint32, t time.Time) ([]byte, error) {
	return json.Marshal(&SrvRecord{
		Host:         ip,
		Port:         json.Number(port),
		TTL:          ttl,
		CreationDate: t,
	})
}

// Close closes the internal etcd client and cannot be used further
func (c *CoreDNS) Close() error {

Приложение `FastAPI` (экземпляр) имеет метод `.openapi()`, который должен возвращать схему OpenAPI.

В процессе создания объекта приложения регистрируется *операция пути* (обработчик пути) для `/openapi.json` (или для того, что указано в вашем `openapi_url`).

Она просто возвращает JSON-ответ с результатом вызова метода приложения `.openapi()`.

По умолчанию метод `.openapi()` проверяет свойство `.openapi_schema`: если в нём уже есть данные, возвращает их.