// ===================================================================================
    // Constant
    //

    // ===================================================================================
    // Attribute
    //
    @Resource
    private UserService userService;

    // ===================================================================================
    // Hook
    // ======

```Python hl_lines="35"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

/// tip

Notice that you are not passing the router itself (`invoices_callback_router`) to `callback=`, but the attribute `.routes`, as in `invoices_callback_router.routes`.

///

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    protected BsCrawlingInfoParamCQ _conditionQuery;
    protected BsCrawlingInfoParamCA _conditionAggregation;

      "h" -> host = value
      "port" -> port = value
      "p" -> path = value
      "q" -> query = value
      "f" -> fragment = value
      else -> throw IllegalArgumentException("unexpected attribute: $value")
    }
  }

  override fun toString(): String = format("Parsing: <%s> against <%s>", input!!, base!!)

  companion object {
    fun load(source: BufferedSource): List<WebPlatformUrlTestData> {

public class BsFavoriteLogCB extends EsAbstractConditionBean {

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    protected BsFavoriteLogCQ _conditionQuery;
    protected BsFavoriteLogCA _conditionAggregation;

public class BsUserInfoCB extends EsAbstractConditionBean {

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    protected BsUserInfoCQ _conditionQuery;
    protected BsUserInfoCA _conditionAggregation;

Type)throw new Error('Invalid "target" value, use a valid Element');if("copy"===this.action&&t.hasAttribute("disabled"))throw new Error('Invalid "target" attribute. Please use "readonly" instead of "disabled" attribute');if("cut"===this.action&&(t.hasAttribute("readonly")||t.hasAttribute("disabled")))throw new Error('Invalid "target" attribute. You can\'t cut text from elements with "readonly" or "disabled" attributes');this._target=t}},get:function(){return this._target}}]),e}();t.exports=u},fu...

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    @Resource
    private DuplicateHostService duplicateHostService;
    @Resource
    private DuplicateHostPager duplicateHostPager;

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    @Resource
    private KeyMatchHelper keyMatchHelper;
    @Resource
    private KeyMatchService keyMatchService;
    @Resource

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    /** createdTime */
    protected Long createdTime;

    /** expiredTime */
    protected Long expiredTime;