HTTP security headers are special header fields sent by web servers in HTTP responses to instruct browsers to take security measures. Properly configured security headers can effectively prevent XSS attacks, clickjacking, data leaks, and other common web security threats.
HTTP security headers are special header fields sent by the server in HTTP responses to instruct browsers to take security measures. Common security headers include Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, etc.
Security headers prevent XSS attacks, clickjacking, MIME sniffing, man-in-the-middle attacks, and other common web security threats. Missing headers make websites vulnerable and are part of OWASP Top 10 security misconfiguration.
The most important headers include: 1) Content-Security-Policy (CSP) prevents XSS; 2) Strict-Transport-Security (HSTS) enforces HTTPS; 3) X-Frame-Options prevents clickjacking; 4) X-Content-Type-Options prevents MIME sniffing; 5) Referrer-Policy controls referrer info.
You can add security headers through web server config (Nginx/Apache config files), application middleware (Express helmet module), or CDN settings (Cloudflare rules). This tool provides config code for each platform.
Absolutely safe. This tool analyzes HTTP response headers locally in your browser. No data is sent to third-party servers. The entered URL is only used to fetch public HTTP response header information.