See the exact HTTP response headers a URL returns — status code, caching, security headers (HSTS, CSP), server and content type. Great for debugging caching, redirects and security configuration. Runs server-side; nothing is stored.
HTTP Header Checker performs a fast, secure server-side lookup and presents the results in a clear, readable format.
Browsers block reading another origin's headers (CORS), so the request runs on our server.
It reads the response headers and status, not the full page body.
No — they're processed live and not saved.
This tool runs a lookup on our server, because a browser can't query DNS/WHOIS/TLS or read other sites' headers directly. Queries aren't stored.