HTTP headers lookup

HTTP Headers Checker — View Server Response Headers Online

Free HTTP headers lookup tool that fetches and displays all response headers returned by any URL for a standard GET request. Essential for debugging caching issues, verifying security headers, and troubleshooting web server configurations.

Important HTTP Headers to Check

• Cache-Control — caching directives and TTL
• Content-Type — MIME type and charset
• X-Frame-Options — clickjacking protection
• Strict-Transport-Security — HSTS configuration
• Content-Security-Policy — XSS protection policy
• X-Content-Type-Options — MIME sniffing protection
• Server — web server software version

Web developers, security auditors, and DevOps engineers use HTTP header checkers to verify security header implementation, debug caching problems, confirm CDN behavior, and ensure proper server configuration.