HTTP Header Checker
Free online HTTP header checker. Inspect the response headers of any URL: status code, full redirect chain, server, caching, cookies and a security header audit (HSTS, CSP, X-Frame-Options and more) showing which protections are present or missing.
Check HTTP response headers
Enter a URL to inspect its status code, redirect chain, response headers and security header audit.
The check fetches the URL from our server following up to 5 redirects, reading headers only (no page body). Results reflect the response at check time; CDN-backed sites may vary by region. Security header audit covers the six most common protections.