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HTTP Header Checker

Inspect HTTP response headers for any URL. Check security headers, caching, and server configuration.

HTTP response headers reveal important information about server configuration, security policies, caching behavior, and content settings. This tool fetches headers from any URL and displays them in a readable format, with notes about important security headers.

Note: Due to browser CORS restrictions, this tool uses a CORS proxy or may have limited results for some URLs. For full header inspection, use browser DevTools or command-line tools like curl.

Checker

Results

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How to Use

  1. Enter the URL to inspect
  2. Click Calculate to fetch headers
  3. Review the response headers and security notes
  4. Note: CORS may limit results for some URLs

FAQ

Why are some headers missing?

Browser CORS policies may filter certain headers. The fetch API only exposes CORS-safe headers by default. For full headers, use browser DevTools (Network tab).

What security headers should I look for?

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

Is my data safe when I use HTTP Header Checker?

Yes. All calculations run entirely in your browser. Your data is never sent to a server, stored in a database, or shared with anyone. You can use this tool with complete confidence that your information remains private.

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