HTTP Header Checker

Check any URL's HTTP response headers, redirects and security headers, with plain-English explanations.

Why use this tool?

See the real HTTP response headers a URL returns, follow its redirects, and check whether key security headers like HSTS and CSP are set.

How to use it

1. Enter a URL (or paste raw headers).
2. Click Check.
3. Review the security checklist and header explanations.