HTTP Header Checker

View all HTTP response headers from any website.

HTTP headers contain crucial metadata exchanged between browsers and web servers. Our HTTP header checker retrieves and displays all response headers from any URL, including cache policies, content type, server information, CORS settings, and security directives.

Result

Enter a URL to see its HTTP headers.
In Action

HTTP Headers in action

Your site passes a security audit on one URL but fails on another. Fetch both with the headers tool and diff them side by side — the difference is usually one missing header added by a plugin or reverse proxy, and the tool makes that difference obvious in seconds.

Frequently Asked Questions

What are HTTP headers?

HTTP headers contain metadata about requests and responses between a browser and server.

How do I view HTTP response headers online for free?

Type a URL and run the check — all response headers (server, cache-control, content-type, security headers) are displayed in a table. It works for any public website without installing curl or developer tools.

Which HTTP security headers should every site have?

At minimum: Content-Security-Policy, Strict-Transport-Security (HSTS), X-Content-Type-Options, and X-Frame-Options. Our tool highlights which of these are present and which are missing, so you can close the gaps.

What does the cache-control header actually do?

Cache-control tells browsers and CDNs how long to store a response (max-age) and whether it can be shared (public/private). Wrong values cause stale content or excessive re-downloads — the two most common page-speed complaints.