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Cloudflare Wildcard Subdomain Cache Not Working: Fixes - How to Fix npm run build Syntax Error-How to Use ARG and .env in Docker Compose Build

Updated 2026-07-28 08:15:09update-problems
Cloudflare Wildcard Subdomain Cache Not Working: Fixes - How to Fix npm run build Syntax Error-How to Use ARG and .env in Docker Compose Build
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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