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HTTP Headers Checker

Inspect browser-visible HTTP response headers, the final status, final URL, cache directives, content type, and security-related headers.

Header Results

HTTP response headers will appear here after checking a URL.

Browser Request Note

This checker sends a browser request to the URL you enter. The target site receives that request, and CORS rules decide which headers the browser exposes. A failed or incomplete result does not prove the site is offline or missing those headers. Redirect chains and non-exposed response details require a server-side checker.

Inspecting Browser-Visible HTTP Response Headers

Response headers can describe content type, caching, browser security policies, server behaviour, and the final response status. They are useful while debugging websites, APIs, CDN behaviour, and technical SEO issues.

This tool shows only the headers that the browser is allowed to expose for the final response. It does not display the complete redirect chain, hidden cross-origin headers, request headers, or server-side network details.

How to Use the HTTP Headers Checker

  1. Enter the website URL you want to inspect.
  2. Click Check Headers.
  3. Review the status code, final URL, and returned headers.
  4. Copy the results if you need to save or share them.

Headers Commonly Checked

  • Status codes such as 200, 301, 302, 404, and 500.
  • Cache headers like Cache-Control, Expires, and ETag.
  • Content-Type and charset values.
  • The final URL after browser-followed redirects.
  • Security headers such as CSP, HSTS, X-Frame-Options, and Referrer-Policy.
  • Server and platform-related response details.

Why HTTP Headers Matter

  • SEO debugging: Final status, final URL, content type, and caching can help explain crawl or delivery problems. Canonical tags are HTML signals and are not confirmed by this tool.
  • Security review: Headers such as Content-Security-Policy and Strict-Transport-Security help reduce common browser-side risks.
  • Performance checks: Cache headers affect how browsers and CDNs store assets and page responses.
  • API debugging: Response headers can explain content types, allowed methods, caching rules, and server behavior.

Frequently Asked Questions

What are HTTP headers?

HTTP headers are key-value pairs sent with requests and responses. They describe server behavior, content type, caching, security policies, redirects, and other response details.

Why does some URL checking fail?

This tool runs in the browser, so some websites may block cross-origin requests. A failed browser check does not always mean the site is offline.

Can this check security headers?

It can display security-related headers only when the browser exposes them. Their presence does not prove that the complete application security configuration is correct.

Is this useful for technical SEO?

Yes. HTTP status codes, redirects, caching, and response headers are important parts of technical SEO debugging.