
HTTP Security Headers in 2026: The Complete Checklist (CSP, HSTS & More)
HTTP security headers kill whole classes of attacks with zero app logic changes, yet under 25% of the web runs a meaningful CSP and 48.8% of those weaken it with unsafe-inline. Here is the complete 2026 checklist: strict nonce CSP, HSTS preload, report-to, and the headers to delete.