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HTTP Header Checker

See the HTTP headers a web page answers with.

The address you enter is sent to UtilSlate’s server, which requests the page (and any redirects) and returns the response headers. Nothing is stored.

What you get

  • Every header
  • Security explained
  • Safe to use

Questions

Which security headers matter most?

Strict-Transport-Security keeps browsers on HTTPS; Content-Security-Policy limits where scripts may come from, the main defence if code is injected; X-Frame-Options or CSP’s frame-ancestors stop other sites framing the page; X-Content-Type-Options: nosniff stops browsers guessing file types. Referrer-Policy and Permissions-Policy fine-tune privacy.

Why do I see different headers than my browser?

The request comes from UtilSlate’s server, not your browser: sites may answer differently depending on the location, the language, cookies or a login, and some block automated requests.

Does it follow redirects?

Yes, up to ten, each checked before it’s requested. The headers shown are the final page’s; each redirect is listed too. The Redirect Checker focuses on the chain itself.

Is it free? Do I need an account?

It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.

Missing something, or not working as it should? Tell us