# aiohttp客户端操作系统错误：连接被对端重置

- **ID:** `python/aiohttp-unexpected-close-connection`
- **领域:** python
- **类别:** network_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

远程服务器意外关闭了 TCP 连接，通常是由于超时、服务器过载或网络问题。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |

## 解决方案

1. **Implement retry logic with exponential backoff** (85% 成功率)
   ```
   for attempt in range(3): try: async with session.get(url) as resp: return await resp.text(); except ClientOSError: await asyncio.sleep(2**attempt)
   ```
2. **Increase the TCP keepalive or use a longer timeout** (75% 成功率)
   ```
   timeout = aiohttp.ClientTimeout(total=60); async with session.get(url, timeout=timeout) as resp: ...
   ```

## 无效尝试

- **Increasing the connector limit to allow more connections** — Connection reset is not related to pool size; it's a network-level issue. (40% 失败率)
- **Disabling SSL verification** — SSL is not the cause; this does not address TCP resets. (30% 失败率)