# werkzeug.exceptions.RequestEntityTooLarge: 413 请求实体过大

- **ID:** `python/flask-request-entity-too-large-413`
- **领域:** python
- **类别:** config_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

上传的载荷超过了Flask中配置的MAX_CONTENT_LENGTH。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 2.x | active | — | — |
| 3.x | active | — | — |

## 解决方案

1. **** (95% 成功率)
   ```
   app.config['MAX_CONTENT_LENGTH'] = 50 * 1024 * 1024  # 50 MB
   ```
2. **** (90% 成功率)
   ```
   f = request.files['file']\nf.save('/tmp/upload.bin')
   ```

## 无效尝试

- **** — Disables limit globally; DoS risk and reverse proxy may still block. (60% 失败率)
- **** — Body already truncated; client retries and fails again. (80% 失败率)