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Fix Cloudflare 521 Error: DNS Configuration Problem - npm run build Fails: Missing Environment Variables Fix-Resolve Cloudflare Wildcard Redirect Loop Issue

2026-07-28 06:35:51
Fix Cloudflare 521 Error: DNS Configuration Problem - npm run build Fails: Missing Environment Variables Fix-Resolve Cloudflare Wildcard Redirect Loop Issue

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

Next references

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