It might be useful, for example, to return custom headers or cookies.

## Return a `Response` { #return-a-response }

In fact, you can return any `Response` or any sub-class of it.

/// tip

`JSONResponse` itself is a sub-class of `Response`.

///

And when you return a `Response`, **FastAPI** will pass it directly.

package org.codelibs.fess.app.web.admin.backup;

import org.lastaflute.web.ruts.multipart.MultipartFormFile;
import org.lastaflute.web.validation.Required;

/**
 * Form class for backup file upload.
 * This form handles file uploads for backup and restore operations.
 */
public class UploadForm {

    /**
     * The backup file to be uploaded.
     */
    @Required
    public MultipartFormFile bulkFile;

    /**

import org.codelibs.fess.app.web.admin.elevateword.DownloadForm;

/**
 * Download body for elevate word API operations.
 * This class extends the DownloadForm to provide request body handling
 * for downloading elevate word configurations via REST API.
 *
 */
public class DownloadBody extends DownloadForm {

    /**
     * Default constructor.
     */
    public DownloadBody() {
        super();
    }

import org.codelibs.fess.app.web.admin.badword.DownloadForm;

/**
 * Download body for Bad Word API operations.
 * This class extends the DownloadForm to provide request body handling
 * for downloading bad word dictionaries via REST API.
 *
 */
public class DownloadBody extends DownloadForm {

    /**
     * Default constructor.
     */
    public DownloadBody() {
        super();
    }

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;

/**
 * Simple derived class to verify that we handle generics correctly.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
public class DerivedComparable extends BaseComparable {
  public DerivedComparable(String s) {
    super(s);
  }

        switch (form.crudMode) {
        case CrudMode.CREATE:
            return OptionalEntity.of(new ScheduledJob()).map(entity -> {
                entity.setCreatedBy(username);
                entity.setCreatedTime(currentTime);
                return entity;
            });
        case CrudMode.EDIT:
            if (form instanceof EditForm) {

package org.codelibs.fess.app.web.api.admin.plugin;

import org.codelibs.fess.app.web.admin.plugin.DeleteForm;

/**
 * Request body class for plugin deletion API endpoint.
 * Extends the standard plugin DeleteForm to provide JSON request body functionality
 * for REST API operations.
 */
public class DeleteBody extends DeleteForm {

    /**
     * Creates a new instance of DeleteBody.

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.util;

import org.dbflute.optional.OptionalEntity;

/**
 * Utility class for Optional operations.
 */
public class OptionalUtil {

    /**
     * Default constructor.
     */
    private OptionalUtil() {
        // Default constructor
    }

    /**

					<div class="input-group-append">
						<button class="btn btn-sidebar" type="submit" name="search" id="search-btn">
							<em class="fa fa-search">
						</button>
					</div>
				</div>
			</form>
		</c:if>
		<nav class="mt-2">

		<ul class="nav nav-pills nav-sidebar flex-column" data-widget="treeview" role="menu">
			<li class="nav-header"><la:message key="labels.sidebar.menu" /></li>

   * authenticator. This gives the authenticator the option to customize the CONNECT request. It can
   * decline to do so by returning null, in which case OkHttp will use it as-is.
   */
  @Throws(IOException::class)
  private fun createTunnelRequest(route: Route): Request {
    val proxyConnectRequest =
      Request
        .Builder()
        .url(route.address.url)