HTTP headers are metadata your server sends with every page — caching, content type, and security directives. This tool fetches any URL live and lists its real response headers plus a security-header checklist.
What is HTTP Header Checker?
An HTTP header checker shows the response headers a server sends back for a URL — status codes, redirects, caching rules, security headers, and server details. It's a fast diagnostic for SEO, performance, and security issues.
How it works
Every time a browser requests a page, the server replies with HTTP headers before the content. These include the status code (200, 301, 404), caching directives, content type, and security headers. The checker fetches and displays them for any URL.
How to use this tool
Enter a URL. The tool returns its full HTTP response headers so you can verify redirects resolve correctly, caching is set, and security headers are present.
Why it matters
Headers quietly control how search engines and browsers treat your site. A wrong status code can deindex a page; missing cache headers slow it down; absent security headers leave it exposed. Checking them catches problems invisible in the browser.
Frequently asked questions
What does a 301 vs 302 status mean?
301 is a permanent redirect that passes SEO equity; 302 is temporary and passes less. Using 302 where you mean 301 is a common, ranking-costing mistake.
Which security headers should I have?
At minimum consider Strict-Transport-Security, X-Content-Type-Options, and a Content-Security-Policy. They harden your site against common attacks.
Why does my page return a 200 but look broken?
A 200 means the server delivered something — but that could be an error page or partial content. Check the actual response body alongside the header.