python runtime_error ai_generated true

TimeoutError: 处理并发请求时，读取操作超时（30 秒后）。

TimeoutError: The read operation timed out (after 30s) while handling concurrent requests

ID: python/fastapi-async-def-blocking-call

其他格式: JSON · Markdown 中文 · English
80%修复率
87%置信度
0证据数
2024-08-21首次发现

版本兼容性

版本状态引入弃用备注
0.100+ active — — —

根因分析

`async def` 端点中的阻塞调用（如 `requests.get`、`time.sleep`、同步数据库驱动）阻塞了事件循环，导致其他请求饥饿。

English

A blocking call (e.g., `requests.get`, `time.sleep`, synchronous DB driver) inside an `async def` endpoint blocks the event loop, starving other requests.

generic

解决方案

  1. 93% 成功率 
    from fastapi.concurrency import run_in_threadpool
result = await run_in_threadpool(requests.get, url)
  2. 95% 成功率 
    async with httpx.AsyncClient() as c:
    r = await c.get(url)

无效尝试

常见但无效的做法:

  1. 75% 失败

    Delays symptom; event loop still blocked.

  2. 70% 失败

    Each worker still blocks on the same call.