JKZ NETWORK
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Free HTTP Headers Lookup Tool

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Examine the exact HTTP response headers returned by a web server for any URL. Troubleshoot redirects, cookie settings, caching, and server response codes.

What are HTTP Response Headers?

Every time a browser requests a web page, the web server replies with the requested content and a set of HTTP response headers. These headers contain metadata that instruct the browser on how to handle, display, cache, and secure the web page. Checking your server's response headers is an essential step in verifying security policies, diagnosing redirect loops, and optimizing caching configurations.

The Importance of HTTP Security Headers

Modern security headers protect your website and visitors from attacks like Cross-Site Scripting (XSS), clickjacking, and packet sniffing. When auditing your HTTP headers, ensure the following keys are present and configured correctly:

  • Strict-Transport-Security (HSTS): Forces the browser to connect exclusively using HTTPS, preventing downgrades to HTTP.
  • Content-Security-Policy (CSP): Prevents unauthorized scripts from executing by restricting allowed source domains.
  • X-Frame-Options (XFO): Prevents your site from being loaded inside an iframe on other websites, mitigating clickjacking attacks.
  • Cache-Control: Dictates how long browser and proxy caches store your page assets, impacting performance.

For more optimization options, use our URL Redirect Checker to trace multi-hop paths, or test performance with the HTTP/2 Checker.

Details - FAQ

HTTP status codes indicate the status of a request: 200 OK means success, 301/302 represent redirects, 404 means page not found, and 500/503 indicate server-side errors.

The Server header identifies the software powering the web host (e.g., nginx, Apache). For security, administrators often hide or mock this header to prevent attackers from targeting known software vulnerabilities.

Cache-Control dictates how browsers cache resources. Proper caching configurations prevent browsers from re-downloading static files (CSS/JS/images) on every visit, speeding up loading times.

Cross-Origin Resource Sharing (CORS) headers (like Access-Control-Allow-Origin) define which external domains are permitted to request assets from your server.

If you utilize a reverse proxy, CDN (like Cloudflare), or firewall, these middle layers frequently modify, filter, or inject custom HTTP headers before the response reaches the client.

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