# 后台任务中的异常被忽略：RuntimeError('task failed')

- **ID:** `python/starlette-background-task-exception-swallowed`
- **领域:** python
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

BackgroundTask 在响应发送后抛出异常；Starlette 记录了它，但客户端已经收到 200。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 0.30+ | active | — | — |

## 解决方案

1. **** (85% 成功率)
   ```
   import logging
logger = logging.getLogger(__name__)
def task():
    try:
        do_work()
    except Exception:
        logger.exception('background failed')
        raise
   ```
2. **** (90% 成功率)
   ```
   from celery import Celery
celery = Celery('app')
celery.send_task('do_work')
   ```

## 无效尝试

- **** — Hides failures from monitoring; no retries or alerts. (80% 失败率)
- **** — Background tasks run after the response; the route already returned. (85% 失败率)