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Fix Docker Nginx 502 Bad Gateway Upstream Error - How to Debug Docker Compose Environment Variables-Resolving index.lock Exists Error in VS Code

Updated 2026-07-28 16:57:52browser-issues

Fix Docker Nginx 502 Bad Gateway Upstream Error - How to Debug Docker Compose Environment Variables-Resolving index.lock Exists Error in VS Code

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.