HTTP Headers Checker
See every HTTP response header a URL returns: server, content-type, caching, compression, security headers, and more. Free and instant.
Frequently asked
Why do the headers differ from my browser's dev tools?
We request the page as a bot from a server, with no cookies or cache. CDNs and apps sometimes vary headers by request, so minor differences are normal.
Which headers matter most for SEO?
content-type, cache-control, x-robots-tag, and any redirect/canonical-related headers. For security, check our Security Headers Grader.