Why results differ

A browser loads the full page, runs scripts, follows redirects, requests assets, uses cache rules, and may have extensions. A curl HEAD request often asks only for headers and may not trigger the same behavior.

  • HEAD and GET can differ on misconfigured servers.
  • Browser cache can preserve old redirects or 404s after the server is fixed.

What each tool is good for

curl is good for quick headers and status checks. Browser DevTools is good for real page behavior. Lighthouse is good for user-experience and performance diagnostics. Crystal Ball is good for SEO-specific checks and repeated crawl patterns.

  • Use multiple tools when the symptom is inconsistent.

How to resolve conflicts

When results disagree, test the same URL repeatedly with the same method, then compare methods. Check server logs for the exact request that failed.

  • If Google or Lighthouse reports 404, treat it seriously even if a quick local HEAD request returns 200.

FAQ

Is curl wrong when the browser shows a different result?

Not necessarily. It may be sending a different request. The disagreement is the clue.

Should I clear browser cache after server fixes?

Yes. Clear cache or use a fresh browser profile when verifying fixes to redirects, 404s, and cached assets.

Need a second set of eyes?

Run a scan, compare the finding to the right guide, and ask for support before changing risky SEO or server settings.

Contact Your SEO Wizard