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HTTP Header Checker

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SEO & Web

HTTP Header Checker

Check HTTP headers of any URL.

Workspace

Run the tool here

Browser utility

Output

Run the workspace to see the response here.

How to use

Enter the full URL, including https://.
Run the check and read the status line first.
Review security and caching headers, then fix them on the server.

About this tool

Inspect the HTTP response headers a URL sends back, including security headers, caching rules and redirects.

HTTP Header Checker is part of the TmpMailer SEO & Web set — free browser utilities that open instantly, need no account, and pair well with a temporary-email workflow when you just need a quick result.

Common use cases

Confirming that HSTS, CSP and X-Frame-Options are present.
Checking whether a CDN is overriding cache headers.
Auditing a redirect chain after a domain migration.

Common questions

Why do headers differ from my browser?

Browsers send their own User-Agent and cookies, and CDNs may vary responses by region or device. This check shows a clean request.

Which security headers matter most?

Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options and a sensible Referrer-Policy cover the common cases.

Can I check a site that blocks bots?

Some sites return 403 to automated requests. A 403 tells you the server is reachable but refusing the request, not that the headers are missing.

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