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Fix Docker Container Exits Immediately After Start - How to Fix Cloudflare 521 Error During Setup-Python Requests UnicodeDecodeError Troubleshooting Guide

Updated 2026-07-28 03:36:12office-tools
Fix Docker Container Exits Immediately After Start - How to Fix Cloudflare 521 Error During Setup-Python Requests UnicodeDecodeError Troubleshooting Guide
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.