Note over client,operation: Response is already sent, can't change it anymore
    opt Tasks
        operation -->> tasks: Send background tasks
    end
    opt Raise other exception
        tasks -->> tasks: Handle exceptions in the background task code
    end
```

/// info

Only **one response** will be sent to the client. It might be one of the error responses or it will be the response from the *path operation*.

  private fun assert200Http2Response(
    response: Response,
    expectedHost: String,
  ) {
    assertThat(response.code).isEqualTo(200)
    assertThat(response.request.url.host).isEqualTo(expectedHost)
    assertThat(response.protocol).isEqualTo(Protocol.HTTP_2)
    response.body.close()
  }

        .url(server.url("/"))
        .header("Connection", "upgrade")
        .build()
    client.newCall(requestWithUpgrade).execute().use { response ->
      assertThat(response.code).isEqualTo(200)
      assertThat(response.socket).isNull()
      assertThat(response.body.string()).isEqualTo("normal request")
    }
    // Confirm there's no RequestBodyStart/RequestBodyEnd on failed upgrades.

import org.codelibs.fess.opensearch.config.exentity.ElevateWord;
import org.codelibs.fess.util.ComponentUtil;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.JsonResponse;
import org.lastaflute.web.response.StreamResponse;

import jakarta.annotation.Resource;

/**
 * API action for admin elevate word management.

class JavaNetAuthenticator : Authenticator {
  @Throws(IOException::class)
  override fun authenticate(
    route: Route?,
    response: Response,
  ): Request? = JAVA_NET_AUTHENTICATOR.authenticate(route, response)

import org.codelibs.fess.opensearch.user.exentity.Group;
import org.codelibs.fess.opensearch.user.exentity.User;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.JsonResponse;

import jakarta.annotation.Resource;

/**
 * API action for admin group management.
 * Provides RESTful API endpoints for managing user group settings in the Fess search engine.

import org.codelibs.fess.app.web.api.admin.FessApiAdminAction;
import org.codelibs.fess.opensearch.config.exentity.BoostDocumentRule;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.JsonResponse;

import jakarta.annotation.Resource;

/**
 * API action for admin boost doc.
 *
 */
public class ApiAdminBoostdocAction extends FessApiAdminAction {

    /**
     * Default constructor.

    factory.newEventSource(request, new EventSourceListener() {
      @Override
      public void onOpen(@NotNull EventSource eventSource, @NotNull Response response) {
        try {
          assertEquals("text/event-stream", response.request().header("Accept"));
        } catch (Exception e) {
          future.completeExceptionally(e);
        }
      }

      @Override

        when(request.getHeader("Authorization")).thenReturn(null);

        networkExplorer.doGet(request, response);

        verify(response).setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        verify(response).setHeader("WWW-Authenticate", "NTLM");
        verify(response).flushBuffer();
    }

    /**
     * Test doGet with NTLM authentication for directory listing

        });
    }

    /**
     * Returns HTML response for the edit page.
     *
     * @return HTML response for the edit page
     */
    private HtmlResponse asEditHtml() {
        return asHtml(path_AdminGroup_AdminGroupEditJsp);
    }

    /**
     * Returns HTML response for the details page.
     *
     * @return HTML response for the details page
     */