Security Headers

Learn how browser security headers reduce common web risks.

Security headers are small HTTP response directives that help browsers enforce safer behavior.

The most important headers are CSP, HSTS, X-Frame-Options or frame-ancestors, Referrer-Policy and Permissions-Policy.

A good setup does not make an application invulnerable, but it reduces impact when bugs happen.

Practical checklist

Add a CSP

Enable HSTS

Restrict framing

Set Referrer-Policy

Disable unused browser features