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Free SEO Tool
Analyze server response headers and security configuration for any URL.
HTTP response headers are metadata sent by a web server along with the requested content. They contain information about caching, security policies, content type, server software, and more. Properly configured headers improve security, performance, and SEO.
Security headers like Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options protect your website and users from attacks such as cross-site scripting (XSS), clickjacking, and man-in-the-middle attacks. Missing security headers leave your site vulnerable.
Content-Security-Policy (CSP) is an HTTP header that controls which resources the browser is allowed to load for a given page. It helps prevent XSS attacks by specifying approved content sources. A well-configured CSP is one of the most effective security headers you can implement.
HTTP Strict-Transport-Security (HSTS) tells browsers to only connect to your site over HTTPS, preventing protocol downgrade attacks and cookie hijacking. Once a browser receives the HSTS header, it will automatically use HTTPS for all future requests to your domain.
The grade is based on the presence and configuration of key security headers: Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, X-XSS-Protection, and Cache-Control. Each present header earns points, and the total determines the letter grade from A+ to F.
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