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Docker Compose Environment Variable Override Not Working: Fixes & Checks - How to Fix Cloudflare Error 521: Origin Server Unreachable-Resolve Node Sass Compilation Failure with Build Tools

Updated 2026-07-28 12:58:53browser-issues
Docker Compose Environment Variable Override Not Working: Fixes & Checks - How to Fix Cloudflare Error 521: Origin Server Unreachable-Resolve Node Sass Compilation Failure with Build Tools
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.

More repair notes

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