HTTP headers checker

What response headers are

Before a browser renders a page, the server sends a block of metadata ahead of the actual content - what type of content it is, how long it may be cached, what security policies apply, which server software answered, and more. This tool fetches a URL and shows exactly that block.

Headers worth knowing

• Content-Type - what kind of content follows, and its character encoding.
• Cache-Control - how long, and under what conditions, a browser or CDN may reuse a cached copy.
• Server / X-Powered-By - what software answered, when the server chooses to disclose it.
• Set-Cookie - a cookie the server is asking the browser to store.

For the headers specifically concerned with security, the dedicated security headers checker gives a clearer pass/fail view than reading the raw list.

Redirects are followed

If the URL redirects, this shows the headers from the final page reached, and reports the final URL and status - use the HTTP status checker to see the redirect chain itself.