What are HTTP response headers?

HTTP response headers are metadata a web server returns alongside the page content – e.g. server type, cache control, content type and security headers. They control how browsers and caches handle the response.

Which security headers matter?

Key security headers include Strict-Transport-Security (HSTS), Content-Security-Policy (CSP), X-Frame-Options, X-Content-Type-Options and Referrer-Policy. They protect against attacks like clickjacking, XSS and protocol downgrades.

Are redirects followed?

Yes. The tool follows redirects (up to 5) and shows the headers of the final destination. Internal/private addresses are not queried for security reasons.

HTTP Header Viewer – Analyze HTTP Response Headers

Enter a URL or domain to analyze its HTTP response headers. Works with and without https://.

My IP HTTP Headers SSL Check DNS Lookup Port Check

What are HTTP headers?

HTTP headers are metadata sent between browser and server with every request and response. They control caching, content types, security policies and much more. Security headers like HSTS, CSP and X-Frame-Options protect against common attacks such as XSS and clickjacking. This tool shows all response headers and checks whether important security headers are present.