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Fix npm run build Failed with PostCSS Error - Nginx Upstream Connection Refused Error Fix-Cloudflare 521 Error: How to Check Server Logs

Updated 2026-07-28 15:27:27developer-tools
Fix npm run build Failed with PostCSS Error - Nginx Upstream Connection Refused Error Fix-Cloudflare 521 Error: How to Check Server Logs
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Decision checklist

  • Match the tool to the workflow that fails most often, not only the feature list.
  • Keep export format, permissions, and automation limits in the final decision.

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