python network_error ai_generated partial

requests.exceptions.ConnectionError: HTTPConnectionPool

ID: python/connectionerror-requests

Also available as: JSON · Markdown
80%Fix Rate
85%Confidence
50Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
311 active — — —

Root Cause

HTTP connection failed. Server down, wrong URL, firewall, or DNS resolution failure.

generic

Workarounds

  1. 90% success Verify the URL is correct and the server is actually running 
    curl -v http://localhost:8000/health

    Sources: https://requests.readthedocs.io/en/latest/user/quickstart/

  2. 85% success Add retry logic with exponential backoff for transient failures 
    from urllib3.util.retry import Retry

    Sources: https://urllib3.readthedocs.io/en/stable/reference/urllib3.util.html#urllib3.util.Retry

  3. 80% success Check firewall, proxy settings, and DNS resolution 
    Check firewall, proxy settings, and DNS resolution

    Sources: https://requests.readthedocs.io/en/latest/user/advanced/#proxies

Dead Ends

Common approaches that don't work:

  1. Increase timeout to very large value 70% fail

    If server is down, waiting longer won't help

  2. Disable SSL verification 80% fail

    ConnectionError is not an SSL error — wrong fix

Error Chain

Frequently confused with: