return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected BadWordCB xprepareCBAsPK(String id) {
        assertObjectNotNull("id", id);
        return newConditionBean().acceptPK(id);
    }

    protected <ENTITY extends BadWord> OptionalEntity<ENTITY> doSelectOptionalByPK(String id, Class<? extends ENTITY> tp) {
        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected BoostDocumentRuleCB xprepareCBAsPK(String id) {
        assertObjectNotNull("id", id);
        return newConditionBean().acceptPK(id);
    }

    protected <ENTITY extends BoostDocumentRule> OptionalEntity<ENTITY> doSelectOptionalByPK(String id, Class<? extends ENTITY> tp) {
        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected DuplicateHostCB xprepareCBAsPK(String id) {
        assertObjectNotNull("id", id);
        return newConditionBean().acceptPK(id);
    }

    protected <ENTITY extends DuplicateHost> OptionalEntity<ENTITY> doSelectOptionalByPK(String id, Class<? extends ENTITY> tp) {
        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected JobLogCB xprepareCBAsPK(String id) {
        assertObjectNotNull("id", id);
        return newConditionBean().acceptPK(id);
    }

    protected <ENTITY extends JobLog> OptionalEntity<ENTITY> doSelectOptionalByPK(String id, Class<? extends ENTITY> tp) {
        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected CrawlingInfoCB xprepareCBAsPK(String id) {
        assertObjectNotNull("id", id);
        return newConditionBean().acceptPK(id);
    }

    protected <ENTITY extends CrawlingInfo> OptionalEntity<ENTITY> doSelectOptionalByPK(String id, Class<? extends ENTITY> tp) {
        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected ElevateWordCB xprepareCBAsPK(String id) {
        assertObjectNotNull("id", id);
        return newConditionBean().acceptPK(id);
    }

    protected <ENTITY extends ElevateWord> OptionalEntity<ENTITY> doSelectOptionalByPK(String id, Class<? extends ENTITY> tp) {
        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected PathMappingCB xprepareCBAsPK(String id) {
        assertObjectNotNull("id", id);
        return newConditionBean().acceptPK(id);
    }

    protected <ENTITY extends PathMapping> OptionalEntity<ENTITY> doSelectOptionalByPK(String id, Class<? extends ENTITY> tp) {
        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

你可以定義背景任務，讓它們在傳回回應之後執行。

這對於那些需要在請求之後發生、但用戶端其實不必在收到回應前等它完成的操作很有用。

例如：

* 在執行某個動作後發送電子郵件通知：
    * 由於連線到郵件伺服器並寄送郵件通常較「慢」（數秒），你可以先立即回應，並在背景中發送郵件通知。
* 處理資料：
    * 例如，收到一個需要經過較慢處理流程的檔案時，你可以先回應「Accepted」（HTTP 202），再在背景處理該檔案。

## 使用 `BackgroundTasks` { #using-backgroundtasks }

首先，匯入 `BackgroundTasks`，並在你的路徑操作函式中定義一個型別為 `BackgroundTasks` 的參數：

{* ../../docs_src/background_tasks/tutorial001_py310.py hl[1,13] *}

        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected UserCB xprepareCBAsPK(String id) {
        assertObjectNotNull("id", id);
        return newConditionBean().acceptPK(id);
    }

    protected <ENTITY extends User> OptionalEntity<ENTITY> doSelectOptionalByPK(String id, Class<? extends ENTITY> tp) {
        return createOptionalEntity(doSelectByPK(id, tp), id);
    }

  * As part of preparation in 1.2 for adding support for protocol buffers (and the
direct YAML support in the API available today), the Content-Type and Accept
headers are now properly handled as per the HTTP spec.  As a consequence, if
you had a client that was sending an invalid Content-Type or Accept header to
the API, in 1.2 you will either receive a 415 or 406 error.
The only client