app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: Union[bool, None] = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}


@app.put("/items/{item_id}")
def update_item(item_id: int, item: Item):

        final ByteArrayInputStream is = new ByteArrayInputStream(html.getBytes("UTF-8"));
        parser.parse(new InputSource(is));
        Node node = parser.getDocument().getFirstChild().getLastChild().getFirstChild();
        return tag.matches(node);
    }

    public void test_normalizeQueryLanguages() {
        FessProp.propMap.clear();
        FessConfig fessConfig = new FessConfig.SimpleImpl() {

	// participating pool's leader node
	globalNotificationSys.LoadRebalanceMeta(ctx, true)
}

func (a adminAPIHandlers) RebalanceStatus(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	objectAPI, _ := validateAdminReq(ctx, w, r, policy.RebalanceAdminAction)
	if objectAPI == nil {
		return
	}

	// Proxy rebalance-status to first pool first node, so that users see a

	// Small - objects smaller than 128MiB
	Small RMetricName = "Small"
	// Total - metric pertaining to totals
	Total RMetricName = "Total"
)

// ReplQNodeStats holds queue stats for replication per node
type ReplQNodeStats struct {
	NodeName      string                               `json:"nodeName"`
	Uptime        int64                                `json:"uptime"`

    assert response.status_code == 200
    assert response.json() == {
        "host": "testserver",
        "save_data": True,
        "if_modified_since": None,
        "traceparent": None,
        "x_tag": [],
    }


def test_header_param_model_invalid(client: TestClient):
    response = client.get("/items/")
    assert response.status_code == 422

  }

  @Benchmark
  int traversal(int reps) {
    int tmp = 0;

    for (int i = 0; i < reps; i++) {
      for (BinaryNode node : view) {
        tmp += node.x;
      }
    }
    return tmp;
  }

{!../../docs_src/metadata/tutorial002.py!}
```

OpenAPIスキーマを完全に無効にする場合は、`openapi_url=None` を設定できます。これにより、それを使用するドキュメントUIも無効になります。

## ドキュメントのURL

以下の2つのドキュメントUIを構築できます:

* **Swagger UI**: `/docs` で提供されます。
     * URL はパラメータ `docs_url` で設定できます。
     * `docs_url=None` を設定することで無効にできます。
* ReDoc: `/redoc` で提供されます。
     * URL はパラメータ `redoc_url` で設定できます。
     * `redoc_url=None` を設定することで無効にできます。

labels.pathmap_pt_both	=	Explorer/afficher
labels.pathmap_pt_stored	=	URL stockées
labels.regular_name	=	Nom régulier
labels.duplicate_name	=	Nom en double
labels.duplicate_host_configuration	=	Hôte en double
labels.duplicate_host_title_details	=	Hôte en double
labels.dashboard_title_configuration	=	Configuration du système
labels.suggest_search_log_enabled	=	Suggérer à partir de mots de recherche

                DependencyScope.TEST.isTransitive(),
                byProjectPath(CommonBuilds.PROJECT_PATH_TEST)));
        result.add(internalScopeManager.createDependencyScope(
                DependencyScope.NONE.id(), DependencyScope.NONE.isTransitive(), Collections.emptySet()));
        result.add(internalScopeManager.createDependencyScope(
                DependencyScope.COMPILE_ONLY.id(),
                DependencyScope.COMPILE_ONLY.isTransitive(),

When you declare a default value for non-path parameters (for now, we have only seen query parameters), then it is not required.

If you don't want to add a specific value but just make it optional, set the default as `None`.

But when you want to make a query parameter required, you can just not declare any default value:

```Python hl_lines="6-7"
{!../../docs_src/query_params/tutorial005.py!}
```