Common Mistakes to Avoid

Setting X-Frame-Options on API endpoints (unnecessary)
Forgetting to set headers on error pages
Inconsistent policies across subdomains
Relying solely on client-side frame-busting scripts
Not testing with actual iframe scenarios

X-Frame-Options remains a simple yet effective defense against clickjacking attacks. While newer standards like CSP frame-ancestors offer more flexibility, X-Frame-Options continues to provide crucial protection, especially for legacy browsers. Implementing it correctly requires understanding your application's framing requirements and applying appropriate policies consistently across all pages that need protection.## Strict-Transport-Security (HSTS) Implementation Guide

HTTP Strict Transport Security (HSTS) serves as a critical security mechanism that protects websites against protocol downgrade attacks and cookie hijacking. By instructing browsers to interact with your site exclusively over HTTPS, HSTS eliminates the window of vulnerability that exists when users access your site via unencrypted HTTP connections. This header transforms HTTPS from a suggestion into a strict requirement, ensuring all communications remain encrypted and authenticated.