Toolzie

HTTP Header Viewer

Limitation: Due to browser security, this tool can only fetch response headers for the current page's URL or resources explicitly allowing cross-origin requests (CORS). It cannot fetch headers for arbitrary external websites.

How to Use the HTTP Header Viewer

Enter URL, click Check. See all response headers: status, content type, server, cache, security headers.

Understand HTTP headers instantly. Debug server configs and API responses without developer tools.

Frequently Asked Questions

Headers?

Status code, content type, server info, cache control, security policies, cookies.

Security important?

Yes, CSP, X-Frame-Options, HSTS protect from attacks.

Any website?

Most public URLs; some may block or have CORS limits.

Status code?

200 success; 301/302 redirect; 404 not found; 500+ errors.

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About This Tool

Inspect the HTTP response headers of any URL with the Toolzie HTTP Header Viewer. Analyze security headers, cache settings, content types, and server information — useful for web developers and security audits.

How to Use

  1. Enter the full URL (including https://) of the page you want to inspect.
  2. Click Fetch Headers.
  3. Browse all response headers returned by the server.
  4. Look for security headers, cache policies, and content type information.

Frequently Asked Questions

What are HTTP headers used for?

HTTP headers carry metadata between the browser and server — including content type, caching rules, security policies, and cookies.

What security headers should I look for?

Key security headers include Content-Security-Policy, X-Frame-Options, Strict-Transport-Security, and X-Content-Type-Options.

Why might a URL fail to load?

Some servers block cross-origin requests (CORS). If a URL fails, the server may require direct browser access.

Can I check my own website's headers?

Yes — enter your own domain to audit your server's response headers and identify missing security policies.