// When
        trans2GetDfsReferral = new Trans2GetDfsReferral(mockConfig, filename);

        // Then
        // These fields are protected in parent class, so we can't access them directly
        // We verify the object was created successfully instead
        assertNotNull(trans2GetDfsReferral);

        // Verify that request buffer was created with correct parameters

* `expose_headers` - 指示可以被浏览器访问的响应头。默认为 `[]`。
* `max_age` - 设定浏览器缓存 CORS 响应的最长时间，单位是秒。默认为 `600`。

中间件响应两种特定类型的 HTTP 请求...

### CORS 预检请求 { #cors-preflight-requests }

这是些带有 `Origin` 和 `Access-Control-Request-Method` 请求头的 `OPTIONS` 请求。

在这种情况下，中间件将拦截传入的请求并进行响应，出于提供信息的目的返回一个使用了适当的 CORS headers 的 `200` 或 `400` 响应。

### 简单请求 { #simple-requests }

任何带有 `Origin` 请求头的请求。在这种情况下，中间件将像平常一样传递请求，但是在响应中包含适当的 CORS headers。

  /**
   * Invoked immediately after sending request headers.
   *
   * This method is always invoked after [requestHeadersStart].
   *
   * @param request the request sent over the network. It is an error to access the body of this
   *     request.
   */
  open fun requestHeadersEnd(
    call: Call,
    request: Request,
  ) {
  }

  /**

import jakarta.annotation.Resource;

/**
 * API action for admin group management.
 * Provides RESTful API endpoints for managing user group settings in the Fess search engine.
 * Groups define user permissions and access controls for search and administrative functions.
 */
public class ApiAdminGroupAction extends FessApiAdminAction {

    private static final Logger logger = LogManager.getLogger(ApiAdminGroupAction.class);

    this.nodeOrder = builder.nodeOrder.cast();
    this.edgeOrder = builder.edgeOrder.cast();
    // Prefer the heavier "MapRetrievalCache" for nodes if lookup is expensive. This optimizes
    // methods that access the same node(s) repeatedly, such as Graphs.removeEdgesConnecting().
    this.nodeConnections =
        (nodeConnections instanceof TreeMap)
            ? new MapRetrievalCache<N, NetworkConnections<N, E>>(nodeConnections)

O middleware responde a dois tipos específicos de solicitação HTTP...

### Requisições CORS pré-voo (preflight) { #cors-preflight-requests }

Estas são quaisquer solicitações `OPTIONS` com cabeçalhos `Origin` e `Access-Control-Request-Method`.

Nesse caso, o middleware interceptará a solicitação recebida e responderá com cabeçalhos CORS apropriados e uma resposta `200` ou `400` para fins informativos.

	echo "group mapping missing on 'minio3', exiting.."
	exit_1
fi

./mc admin user svcacct add minio2 foobar --access-key testsvc --secret-key testsvc123
if [ $? -ne 0 ]; then
	echo "adding svc account failed, exiting.."
	exit_1
fi

./mc admin user svcacct add minio2 minio --access-key testsvc2 --secret-key testsvc123
if [ $? -ne 0 ]; then
	echo "adding root svc account testsvc2 failed, exiting.."
	exit_1
fi

when the popper is created.<br />\n   * By default, it is set to no-op.<br />\n   * Access Popper.js instance with `data.instance`.\n   * @prop {onCreate}\n   */\n  onCreate: () => {},\n\n  /**\n   * Callback called when the popper is updated. This callback is not called\n   * on the initialization/creation of the popper, but only on subsequent\n   * updates.<br />\n   * By default, it is set to no-op.<br />\n   * Access Popper.js instance with `data.instance`.\n   * @prop {onUpdate}\n   */\n  onUpdate:...

        }
    }

    // ===================================================================================
    //                                                                            Accessor
    //                                                                            ========
    @Override
    public Map<String, Object> getAllElements() { // not null after parsing
        return elementsAll;
    }

import java.util.NoSuchElementException;
import java.util.PriorityQueue;
import java.util.Queue;
import org.jspecify.annotations.Nullable;

/**
 * A double-ended priority queue, which provides constant-time access to both its least element and
 * its greatest element, as determined by the queue's specified comparator. If no comparator is
 * given at creation time, the natural order of elements is used. If no maximum size is given at