HTTP Header Analyzer

HTTP Header Analyzer fetches a URL and displays the full set of HTTP response headers a server returns, letting you inspect how a site communicates metadata about its content, caching, and security. Response headers govern things the browser never shows in the page itself: the status code, content type and encoding, caching directives, cookies, redirects, and the security policies that protect users. Reviewing them is the fastest way to understand how a server is actually behaving versus how you assume it is configured.

The tool issues a request and reports each header the server sends back, including general headers like Server and Date, content headers like Content-Type and Content-Length, caching headers like Cache-Control, ETag, and Expires, and security headers such as Strict-Transport-Security, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, and Referrer-Policy. Seeing them together makes it easy to spot a missing or misconfigured directive that weakens caching efficiency or leaves the site open to clickjacking or MIME-sniffing attacks.

Common use cases include security audits to confirm hardening headers are present, performance reviews to verify caching is set up so browsers and CDNs reuse assets, debugging redirect chains and unexpected status codes, and confirming that a CDN or reverse proxy is adding or stripping the headers you expect. Developers also use it to verify CORS headers, compression negotiation, and cookie attributes like Secure, HttpOnly, and SameSite.

A practical tip is to focus first on the security headers, since their absence is invisible to ordinary users but meaningful to attackers; enabling HSTS, a solid Content-Security-Policy, and X-Content-Type-Options closes common gaps. For caching, confirm that static assets carry long max-age values while dynamic responses use no-cache or short lifetimes. When the response involves HTTPS, complement this analysis with an SSL Certificate Checker to ensure the transport layer is as healthy as the headers suggest.