Tool guide
HTTP Header Checker Tool
A good HTTP header checker tool should show the response your users actually receive, not only what your app code says it sends.
What To Check First
Start with the final public URL. Redirects, CDN rules, and hosting defaults can all change headers before the browser receives the page.
Look for the browser security baseline: Content-Security-Policy, Strict-Transport-Security, X-Frame-Options or frame-ancestors, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy.
How To Use The Results
Treat missing headers as a fix list, not a panic list. Some headers are quick wins, while CSP and Permissions-Policy need more careful testing.
Use raw headers when you need to compare production with staging or show a hosting provider exactly what the live response returned.
When A Header Looks Wrong
If a header is configured but missing, check the final URL, then review CDN, reverse proxy, and framework middleware rules.
A header can also differ by route. The homepage, dashboard, API route, and static asset responses may not share the same policy.
Common questions
What is an HTTP header checker tool?
It is a tool that requests a public URL and shows the HTTP response headers returned by the server, CDN, or hosting layer.
Can it check security headers?
Yes. HeaderCheckr highlights common browser security headers and explains useful next fixes.
Why should I check the final URL?
Redirects can land on a different host or route with different headers. The final response is what the browser uses.
Is this a full security audit?
No. Header checks are a useful browser-facing baseline, but they do not replace application testing or infrastructure review.