# aiohttp多部分错误：在多部分正文中找不到边界

- **ID:** `python/aiohttp-multipart-parse-error`
- **领域:** python
- **类别:** data_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

多部分请求体格式错误或缺少边界参数。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 3.7 | active | — | — |
| 3.8 | active | — | — |

## 解决方案

1. **** (95% 成功率)
   ```
   writer = aiohttp.MultipartWriter(); part = payload; writer.append(part); await session.post(url, data=writer)
   ```
2. **** (85% 成功率)
   ```
   headers = {'Content-Type': 'multipart/form-data; boundary=myboundary'}; data = '--myboundary...'
   ```

## 无效尝试

- **** — If the server expects a specific boundary, it won't match. (70% 失败率)
- **** — The data cannot be parsed, leading to incomplete processing. (90% 失败率)