HTTP Headers Test: Analyze Response Headers for Security & SEO
📸 Live preview — Security and SEO headers.
Why HTTP Headers Matter for SEO & Security
HTTP response headers provide crucial metadata about your server's response. Security headers (like Content-Security-Policy, X-Frame-Options, HSTS) protect against XSS, clickjacking, and man-in-the-middle attacks. SEO-related headers (Canonical, Cache-Control, Last-Modified) influence crawling and indexing. Our tool fetches headers via a fetch request (CORS permitting) and displays them in a human‑readable format, highlighting important security indicators.
Common headers to check: Strict-Transport-Security (forces HTTPS), X-Content-Type-Options (prevents MIME sniffing), Referrer-Policy, Content-Security-Policy (CSP), and X-Frame-Options (clickjacking protection). Missing security headers expose your site to risks; we flag them for improvement.
📌 How to Use
- Enter any URL (with http:// or https://).
- Click "Test Headers".
- Review the list of response headers and security recommendations.
✨ Features
🔍 Most Searched Keywords
⚙️ How It Works
The tool uses the Fetch API to request the URL, then extracts the response headers from the Headers interface. Because of CORS restrictions, the tool may only see a subset of headers on some sites. For complete analysis, use it on your own domains where CORS is less restrictive. The output is displayed as key‑value pairs, with security flags highlighted.
🎯 Benefits
✅ Identify missing security headers.
✅ Improve browser security posture.
✅ Optimize caching for better performance.
✅ Free and private.
🔗 Related Tools
❓ FAQ
CORS restricts access to certain headers from cross‑origin requests. Use a server‑side tool for full visibility.
At minimum, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and HSTS (if HTTPS).
Yes, forever.