Client-side web security is frequently overlooked by developers who assume backend firewalls are sufficient. However, modern web apps execute massive amounts of JavaScript in visitor browsers, making Frontend Security Hardening your first line of defense against account takeovers and data breaches.
Essential Security Headers Checklist
- Content-Security-Policy (CSP): Strict whitelist of executable script sources.
- Strict-Transport-Security (HSTS): Enforces 100% encrypted HTTPS traffic.
- X-Frame-Options: `DENY` to prevent iframe clickjacking.
- X-Content-Type-Options: `nosniff` to prevent MIME-type confusion attacks.
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