following code:

             <u style="text-decoration-style:solid">from </u><u style="text-decoration-style:solid"><b>main</b></u><u style="text-decoration-style:solid"> import </u><u style="text-decoration-style:solid"><b>app</b></u>

import org.codelibs.fess.Constants;
import org.codelibs.fess.app.pager.AccessTokenPager;
import org.codelibs.fess.app.web.CrudMode;
import org.codelibs.fess.app.web.admin.accesstoken.AdminAccesstokenAction;
import org.codelibs.fess.app.web.api.ApiResult;
import org.codelibs.fess.app.web.api.ApiResult.ApiConfigResponse;
import org.codelibs.fess.app.web.api.ApiResult.ApiConfigsResponse;
import org.codelibs.fess.app.web.api.ApiResult.ApiResponse;

 */
package org.codelibs.fess.app.web.admin.duplicatehost;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.fess.Constants;
import org.codelibs.fess.annotation.Secured;
import org.codelibs.fess.app.pager.DuplicateHostPager;
import org.codelibs.fess.app.service.DuplicateHostService;
import org.codelibs.fess.app.web.CrudMode;

errors.login.failure = Logowanie nie powiodło się.
errors.app.illegal.transition = Nieprawidłowe przejście. Spróbuj ponownie.
errors.app.db.already.deleted = Mogło zostać już usunięte przez inny proces. Spróbuj ponownie.
errors.app.db.already.updated = Mogło zostać już zaktualizowane przez inny proces. Spróbuj ponownie.
errors.app.db.already.exists = Dane już istnieją. Spróbuj ponownie.

The `lifespan` parameter of the `FastAPI` app takes an **async context manager**, so we can pass our new `lifespan` async context manager to it.

{* ../../docs_src/events/tutorial003.py hl[22] *}

## Alternative Events (deprecated) { #alternative-events-deprecated }

/// warning

import org.codelibs.fess.Constants;
import org.codelibs.fess.app.pager.LabelTypePager;
import org.codelibs.fess.app.service.LabelTypeService;
import org.codelibs.fess.app.web.CrudMode;
import org.codelibs.fess.app.web.api.ApiResult;
import org.codelibs.fess.app.web.api.ApiResult.ApiConfigResponse;
import org.codelibs.fess.app.web.api.ApiResult.ApiResponse;
import org.codelibs.fess.app.web.api.ApiResult.ApiUpdateResponse;

 */
package org.codelibs.fess.app.web.api.admin.backup;

import static org.codelibs.core.stream.StreamUtil.stream;
import static org.codelibs.fess.app.web.admin.backup.AdminBackupAction.NDJSON_EXTENTION;
import static org.codelibs.fess.app.web.admin.backup.AdminBackupAction.getBackupItems;
import static org.codelibs.fess.app.web.admin.backup.AdminBackupAction.getClickLogNdjsonWriteCall;

import org.codelibs.fess.Constants;
import org.codelibs.fess.annotation.Secured;
import org.codelibs.fess.app.pager.DataConfigPager;
import org.codelibs.fess.app.service.DataConfigService;
import org.codelibs.fess.app.service.RoleTypeService;
import org.codelibs.fess.app.web.CrudMode;
import org.codelibs.fess.app.web.base.FessAdminAction;
import org.codelibs.fess.ds.DataStoreFactory;
import org.codelibs.fess.helper.PermissionHelper;

import org.codelibs.fess.Constants;
import org.codelibs.fess.annotation.Secured;
import org.codelibs.fess.app.pager.StopwordsPager;
import org.codelibs.fess.app.service.StopwordsService;
import org.codelibs.fess.app.web.CrudMode;
import org.codelibs.fess.app.web.admin.dict.AdminDictAction;
import org.codelibs.fess.app.web.base.FessAdminAction;
import org.codelibs.fess.dict.stopwords.StopwordsItem;
import org.codelibs.fess.util.ComponentUtil;

<img src="/img/tutorial/generate-clients/image04.png">

The response object will also have autocompletion:

<img src="/img/tutorial/generate-clients/image05.png">

## FastAPI App with Tags { #fastapi-app-with-tags }

In many cases, your FastAPI app will be bigger, and you will probably use tags to separate different groups of *path operations*.