Security Headers & HTTP Status Checker
Audit modern HTTP security headers: HSTS, CSP, X-Frame-Options, Permissions-Policy, CORS, and compression.
Why HTTP Security Headers matter for modern websites
HTTP security headers instruct client browsers how to handle content safely, preventing cross-site scripting (XSS), clickjacking, code injection, MIME-sniffing, and SSL-stripping attacks. Agencies and developers use this tool before client handoffs to verify compliance with OWASP recommendations and ensure optimal transport compression.
Related free web tools
Frequently Asked Questions
HSTS instructs browsers that a site must only ever be accessed using HTTPS, blocking unencrypted HTTP communication and SSL-stripping man-in-the-middle attacks.
CSP restricts which scripts, styles, and external assets the browser is permitted to execute, acting as the primary defense against Cross-Site Scripting (XSS).
X-Frame-Options prevents other websites from embedding your site inside an iframe, stopping clickjacking attacks where hidden UI overlays trick users into clicking buttons.
Exposing exact server versions (e.g., Apache/2.4.41 or PHP/8.1) helps attackers identify known vulnerabilities to exploit.