HTTP Headers Checker — View Response Headers Online

The 101IP HTTP Headers Checker lets you view the full list of HTTP response headers for any website — directly from your browser, without tools or software installation.

What are HTTP response headers?

HTTP headers are metadata that the server sends with each response. They control caching, security, encoding, redirects, and much more. The key headers our tool shows:

• Server / X-Powered-By — web server type and backend technology;
• Content-Type / Content-Encoding — content type and compression method;
• Cache-Control / ETag — caching behavior;
• Strict-Transport-Security (HSTS) — forced HTTPS;
• X-Frame-Options — clickjacking protection;
• Content-Security-Policy (CSP) — script and resource loading policy;
• Access-Control-Allow-Origin (CORS) — cross-origin request policy;
• Set-Cookie — cookie settings;
• CF-Ray / CF-Cache-Status — Cloudflare CDN headers.

When is HTTP Headers Checker useful?

• checking security headers for a website audit;
• diagnosing caching issues and CDN configuration;
• verifying CORS settings for API integration;
• detecting web server and framework in use;
• checking redirect chains and final URLs.

Bookmark 101IP and use our free HTTP headers checker whenever you need to quickly inspect a website's response headers.