~/tools / security-headers
Security Headers Checker
Scan HTTP security headers. Grades HSTS, CSP, X-Frame-Options and others, with explanations of what each header protects.
[ WARNING ]
Decent but improvable (57/100) — missing: Referrer-Policy, Permissions-Policy · weak: content-security-policy
── output ─────
57
security_score
HTTP 200 · https://www.lemonde.fr/
Strict-Transport-Security (HSTS)
[ STRONG ]
// Forces HTTPS for all connections. Prevents downgrade attacks.
max-age=31557600
Content-Security-Policy (CSP)
[ WEAK ]
// Defines which sources of scripts/styles/images are allowed. Prevents XSS.
default-src data: 'unsafe-inline' 'unsafe-eval' https:; script-src data: 'unsafe-inline' 'unsafe-eval' https: blob:; style-src data: 'unsafe-inline' https:; img-src data: https: blob:; font-src data: https:; connect-src https: wss:; media-src https: blob: data:; object-src https:; child-src https: data: blob:; form-action https:; block-all-mixed-content; frame-ancestors 'self' https://apps.lemonde.fr;
X-Frame-Options
[ STRONG ]
// Prevents clickjacking by blocking iframe embedding from other origins.
SAMEORIGIN
X-Content-Type-Options
[ STRONG ]
// Prevents MIME sniffing. Should be 'nosniff'.
nosniff
Referrer-Policy
[ MISSING ]
// Controls how much referrer info is leaked when navigating away.
// missing — add this header to improve security
Permissions-Policy
[ MISSING ]
// Restricts which browser features (camera, mic, etc.) the page can use.
// missing — add this header to improve security