python network_error ai_generated true

asyncio.exceptions.TimeoutError: Connection timeout to host

ID: python/aiohttp-client-connector-timeout

Also available as: JSON · Markdown · 中文
80%Fix Rate
82%Confidence
0Evidence
2024-09-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.10 active — — —
3.11 active — — —

Root Cause

The TCP connection to the remote host takes longer than the specified timeout, often due to network issues or server overload.

generic

中文

与远程主机的 TCP 连接耗时超过指定的超时时间，通常是由于网络问题或服务器过载。

Workarounds

  1. 85% success Implement exponential backoff retry logic 
    import asyncio
async def fetch_with_retry(url, max_retries=3):
    for i in range(max_retries):
        try:
            async with session.get(url, timeout=aiohttp.ClientTimeout(total=10)) as resp:
                return await resp.text()
        except asyncio.TimeoutError:
            await asyncio.sleep(2**i)
    raise
  2. 80% success Use a custom connector with adjusted timeouts 
    connector = aiohttp.TCPConnector(limit=10, force_close=True)
timeout = aiohttp.ClientTimeout(total=30, connect=10)
async with aiohttp.ClientSession(connector=connector, timeout=timeout) as session:

Dead Ends

Common approaches that don't work:

  1. Increasing timeout to a very high value 30% fail

    This masks the underlying issue and may cause the application to hang indefinitely.

  2. Retrying immediately without backoff 60% fail

    If the server is overloaded, immediate retries may worsen the situation and still timeout.