participant handler as Exceptionhandler
participant dep as Abhängigkeit mit yield
participant operation as Pfadoperation
participant tasks as Hintergrundtasks

    Note over client,operation: Kann Exceptions auslösen, inklusive HTTPException
    client ->> dep: Startet den Request
    Note over dep: Führt den Code bis zum yield aus
    opt Löst Exception aus
        dep -->> handler: Löst Exception aus
        handler -->> client: HTTP-Error-Response

    }

    /**
     * Serialize the inbound Model instance to a StringWriter, perform the regex replacement to resolve
     * POM expressions, then re-parse into the resolved Model instance.
     * <p>
     * <b>NOTE:</b> This will result in a different instance of Model being returned!!!
     *
     * @param model The inbound Model instance, to serialize and reference for expression resolution

예를 들어, `title` 메타데이터 값을 경로 매개변수 `item_id`에 선언하려면 다음과 같이 입력할 수 있습니다:

{* ../../docs_src/path_params_numeric_validations/tutorial001.py hl[10] *}

/// note | 참고

경로 매개변수는 경로의 일부여야 하므로 언제나 필수적입니다.

즉, `...`로 선언해서 필수임을 나타내는게 좋습니다.

그럼에도 `None`으로 선언하거나 기본값을 지정할지라도 아무 영향을 끼치지 않으며 언제나 필수입니다.

///

## 필요한 경우 매개변수 정렬하기

`str` 형인 쿼리 매개변수 `q`를 필수로 선언하고 싶다고 해봅시다.

        // Protocol ID validation not applicable for transform header - method does not exist
        // No validation needed as transform header handles protocol ID internally
    }

    @Test
    @DisplayName("Should handle null protocol ID")
    void testNullProtocolId() {
        // Protocol ID is a constant in transform header, not settable

Це дозволить Вам **повторно використовувати модель** у **різних місцях**, а також оголошувати перевірки та метадані для всіх параметрів одночасно. 😎

/// note | Примітка

Ця можливість підтримується, починаючи з версії FastAPI `0.115.0`. 🤓

///

## Query параметри з Pydantic-моделлю

Он не будет сериализован при помощи модели и т.д.

Убедитесь, что в нём содержатся именно те данные, которые вы хотите, и что значения являются валидным JSON (если вы используете `JSONResponse`).

///

/// note | Технические детали

Вы также можете использовать `from starlette.responses import JSONResponse`.

<span style="color: green;">INFO</span>:     Waiting for application startup.
<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

/// note | 참고

`uvicorn main:app` 명령은 다음을 의미합니다:

* `main`: 파일 `main.py` (파이썬 "모듈").
* `app`: `main.py` 내부의 `app = FastAPI()` 줄에서 생성한 오브젝트.
* `--reload`: 코드 변경 시 자동으로 서버 재시작. 개발 시에만 사용.

///

     * @see org.apache.maven.api.services.DependencyResolver#flatten(Session, Node, PathScope)
     */
    @Nonnull
    List<Node> flattenDependencies(@Nonnull Node node, @Nonnull PathScope scope);

    /**
     * Shortcut for {@code getService(DependencyResolver.class).resolve(...).getPaths()}.
     *
     * @param dependencyCoordinates coordinates of the dependency for which to get the paths

   * throws a {@link NullPointerException}.
   *
   * <p>To find the first non-null element in an iterable, use {@code Iterables.find(iterable,
   * Predicates.notNull())}. For varargs, use {@code Iterables.find(Arrays.asList(a, b, c, ...),
   * Predicates.notNull())}, static importing as necessary.
   *

  }

  /**
   * Returns a supplier that always supplies {@code instance}.
   *
   * <p><b>Discouraged:</b> Prefer using {@code () -> instance}, but note that lambdas do not have
   * human-readable {@link #toString()} representations and are not serializable. If you need a
   * supplier that is serializable, use {@code (Supplier<T> & Serializable) () -> instance}.
   */