👆 🔜 ⚫️ ⏮️ ❎ 🌐 👆 *➡ 🛠️*.

```Python hl_lines="2  12-21  24"
{!../../docs_src/path_operation_advanced_configuration/tutorial002.py!}
```

/// tip

🚥 👆 ❎ 🤙 `app.openapi()`, 👆 🔜 ℹ `operationId`Ⓜ ⏭ 👈.

///

/// warning

🚥 👆 👉, 👆 ✔️ ⚒ 💭 🔠 1️⃣ 👆 *➡ 🛠️ 🔢* ✔️ 😍 📛.

🚥 👫 🎏 🕹 (🐍 📁).

///

## 🚫 ⚪️➡️ 🗄

To see an example, check the [Project Generators](../project-generation.md){.internal-link target=_blank}, they all include Celery already configured.

But if you need to access variables and objects from the same **FastAPI** app, or you need to perform small background tasks (like sending an email notification), you can simply just use `BackgroundTasks`.

## Recap

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.storage;

import static org.codelibs.core.stream.StreamUtil.split;

import java.io.InputStream;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Base64;

      System.setSecurityManager(oldSecurityManager);
      Policy.setPolicy(oldPolicy);
    }
  }

  // If you have a FinalizableReferenceQueue that is a static field of one of the classes of your
  // app (like the FrqUser class above), then the app's ClassLoader will never be gc'd. The reason
  // is that we attempt to run a thread in a separate ClassLoader that will detect when the FRQ

* The frontend stores that token temporarily somewhere.
* The user clicks in the frontend to go to another section of the frontend web app.
* The frontend needs to fetch some more data from the API.
    * But it needs authentication for that specific endpoint.

首先，要关注的是依赖项。

依赖项就是一个函数，且可以使用与*路径操作函数*相同的参数：

```Python hl_lines="8-11"
{!../../docs_src/dependencies/tutorial001.py!}
```

大功告成。

只用了**2 行**代码。

依赖项函数的形式和结构与*路径操作函数*一样。

因此，可以把依赖项当作没有「装饰器」（即，没有 `@app.get("/some-path")` ）的路径操作函数。

依赖项可以返回各种内容。

本例中的依赖项预期接收如下参数：

* 类型为 `str` 的可选查询参数 `q`
* 类型为 `int` 的可选查询参数 `skip`，默认值是 `0`
* 类型为 `int` 的可选查询参数 `limit`，默认值是 `100`

然后，依赖项函数返回包含这些值的 `dict`。

    return User()


@app.get("/items/")
def read_items(user: User = Depends(get_current_user)):
    ...


@app.post("/items/")
def create_item(*, user: User = Depends(get_current_user), item: Item):
    ...


@app.get("/items/{item_id}")
def read_item(*, user: User = Depends(get_current_user), item_id: int):
    ...


@app.delete("/items/{item_id}")

import org.codelibs.core.stream.StreamUtil;
import org.codelibs.curl.CurlResponse;
import org.codelibs.fess.Constants;
import org.codelibs.fess.annotation.Secured;
import org.codelibs.fess.app.service.ScheduledJobService;
import org.codelibs.fess.app.web.base.FessAdminAction;
import org.codelibs.fess.es.client.SearchEngineClient;
import org.codelibs.fess.es.config.exbhv.DataConfigBhv;
import org.codelibs.fess.es.config.exbhv.ElevateWordBhv;

                    <mxGeometry x="890" y="650" width="300" height="100" as="geometry"/>...

        }

        TimeoutTask systemMonitorTask = null;
        int exitCode;
        try {
            SingletonLaContainerFactory.setConfigPath("app.xml");
            SingletonLaContainerFactory.setExternalContext(new GenericExternalContext());
            SingletonLaContainerFactory.setExternalContextComponentDefRegister(new GenericExternalContextComponentDefRegister());