python network_error ai_generated true

aiohttp.client_exceptions.ClientProxyConnectionError: Cannot connect to proxy

ID: python/aiohttp-client-connector-proxy-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
82%Confidence
0Evidence
2025-05-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.10 active — — —
3.11 active — — —

Root Cause

The HTTP/HTTPS proxy server is unreachable or refusing connections.

generic

中文

HTTP/HTTPS 代理服务器不可达或拒绝连接。

Workarounds

  1. 85% success Verify proxy settings and use proxy authentication if needed 
    proxy_auth = aiohttp.BasicAuth('user', 'pass')
async with aiohttp.ClientSession() as session:
    async with session.get(url, proxy='http://proxy.example.com:8080', proxy_auth=proxy_auth) as resp:
  2. 80% success Use environment variables for proxy configuration 
    import os
os.environ['HTTP_PROXY'] = 'http://proxy.example.com:8080'
os.environ['HTTPS_PROXY'] = 'http://proxy.example.com:8080'

Dead Ends

Common approaches that don't work:

  1. Disabling proxy usage entirely 40% fail

    This may bypass corporate network policies or cause direct access failures.

  2. Using a different proxy without authentication 50% fail

    The new proxy may also be unreachable or require authentication.