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Headers Checker

Review HTTP response headers for caching, content type, security, and debugging information.

Guide

Interactive workspace

No account required
Inspect HTTP headers

Review the response code, redirect chain, and headers for a public URL.

Enter a public URL above to see its HTTP response.
Repeat timing sample & raw headers

Run three back-to-back checks to see response-time variance, and review the complete raw header set.

How to use it

  1. Enter a public HTTP or HTTPS URL.
  2. Run the check and review the security, caching, and content sections.
  3. Open a missing or unexpected header to read its purpose and recommended fix.
  4. Re-check after changing the origin or CDN configuration.
What is Headers Checker?

Review HTTP response headers for caching, content type, security, and debugging information.

How it works

SiteIndex groups the returned response headers into Security, Caching, and Content sections with plain labels. The Advanced panel shows the complete raw header set for deeper debugging.

Common uses
  • Check whether key security headers (HSTS, CSP, X-Frame-Options) are present.
  • Review caching headers to understand how a page is cached.
  • Confirm content-type and server headers during debugging.
Limitations
  • Results depend on the browser, network, input, and external service involved.
  • This tool is informational and does not replace specialist diagnostics or professional advice.
Frequently asked questions
Why are some headers missing?
Only headers the server actually returns are shown; many optional security headers must be explicitly configured by the site owner.

Learn more

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