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Fix 'nginx: configuration test failed unexpected end of file' - How to Fix Cloudflare Error 521: Origin Server Unreachable-Docker Build Canceled: How to Handle Large Contexts

2026-07-28 14:30:34
Fix 'nginx: configuration test failed unexpected end of file' - How to Fix Cloudflare Error 521: Origin Server Unreachable-Docker Build Canceled: How to Handle Large Contexts

Result check

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

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