summary: Optional[str] = None
    description: Optional[str] = None
    externalDocs: Optional[ExternalDocumentation] = None
    operationId: Optional[str] = None
    parameters: Optional[list[Union[Parameter, Reference]]] = None
    requestBody: Optional[Union[RequestBody, Reference]] = None
    # Using Any for Specification Extensions
    responses: Optional[dict[str, Union[Response, Any]]] = None

    return {"p": p.p}


@pytest.mark.parametrize(
    "path",
    ["/optional-str", "/model-optional-str"],
)
def test_optional_str_schema(path: str):
    assert app.openapi()["paths"][path]["get"]["parameters"] == [
        {
            "required": False,
            "schema": {
                "anyOf": [{"type": "string"}, {"type": "null"}],
                "title": "P",
            },
            "name": "p",

# Parâmetros de Cabeçalho { #header-parameters }

Você pode definir parâmetros de Cabeçalho da mesma maneira que define paramêtros com `Query`, `Path` e `Cookie`.

## Importe `Header` { #import-header }

Primeiro importe `Header`:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[3] *}

## Declare parâmetros de `Header` { #declare-header-parameters }

     * Do not instantiate.
     */
    protected ConstructorUtil() {
    }

    /**
     * Creates and initializes a new instance of the class declared by the specified constructor with the given initialization parameters.
     *
     * @param <T> the type of the object
     * @param constructor the constructor (must not be {@literal null})
     * @param args the array of objects to be passed as arguments to the constructor invocation

Эта настройка изменит цветовую тему подсветки синтаксиса:

<img src="/img/tutorial/extending-openapi/image04.png">

## Изменить параметры Swagger UI по умолчанию { #change-default-swagger-ui-parameters }

FastAPI включает некоторые параметры конфигурации по умолчанию, подходящие для большинства случаев.

Это включает следующие настройки по умолчанию:

{* ../../fastapi/openapi/docs.py ln[9:24] hl[18:24] *}

                            },
                        },
                    },
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "parameters": [
                        {
                            "required": False,
                            "schema": {
                                "anyOf": [{"type": "string"}, {"type": "null"}],

* MavenSession

  We may need to enable the context injection here, since this will be
  instantiated per-project. If we always inject the same context parameters,
  and are careful to inject nulls where things are missing, we should be

      algorithmParameters,
      decompose = {
        listOf(
          it.algorithm,
          it.parameters,
        )
      },
      construct = {
        AlgorithmIdentifier(
          algorithm = it[0] as String,
          parameters = it[1],
        )
      },
    )

  /**
   * ```
   * BasicConstraints ::= SEQUENCE {

    @PostConstruct
    public void init() {
        createFilterChain();
    }

    /**
     * Executes query processing through the filter chain.
     *
     * @param context the query context containing search parameters and state
     * @param query the Lucene query to be processed
     * @param boost the boost factor to apply to the query
     * @return the processed OpenSearch QueryBuilder
     */

    return {"p": p.p}


@pytest.mark.parametrize(
    "path",
    ["/required-str", "/model-required-str"],
)
def test_required_str_schema(path: str):
    assert app.openapi()["paths"][path]["get"]["parameters"] == [
        {
            "required": True,
            "schema": {"title": "P", "type": "string"},
            "name": "p",
            "in": "cookie",
        }
    ]


@pytest.mark.parametrize(