Free security headers checker · Instant · No signup
Security Headers Checker
Grade your site’s HTTP security headers. Domain Doctor checks HSTS, CSP, X-Content-Type-Options, X-Frame-Options and more, with fixes for each gap.
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- Every failing check fixed and verified
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What this checks
HTTP security headers are the browser-side defences that stop clickjacking, MIME sniffing, protocol downgrade and cross-site scripting. They cost nothing to add and dramatically raise the bar for attackers.
Domain Doctor inspects your live response headers for HSTS (with includeSubDomains/preload), Content-Security-Policy, X-Content-Type-Options, X-Frame-Options / frame-ancestors, Referrer-Policy and Permissions-Policy, then grades your configuration and shows the exact header to add for each gap.
Common Security Headers Checker errors
- Missing Strict-Transport-Security (HSTS)
- No Content-Security-Policy, leaving XSS unmitigated
- Missing X-Content-Type-Options: nosniff
- No clickjacking protection (X-Frame-Options / frame-ancestors)
- Missing Referrer-Policy or Permissions-Policy
VASTROX MANAGED HOSTING
A-grade security headers, configured for you
VASTROX managed hosting ships HSTS, CSP and the full header set tuned to your site — no misconfiguration risk.
- HSTS, CSP and clickjacking protection
- Headers tuned to your assets (no breakage)
- Continuously monitored
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Frequently asked questions
Which security headers matter most?
HSTS, Content-Security-Policy, X-Content-Type-Options and a clickjacking protection (X-Frame-Options or CSP frame-ancestors) are the highest-impact. Referrer-Policy and Permissions-Policy round it out.
Will adding headers break my site?
HSTS and nosniff are safe. Content-Security-Policy needs care — start in report-only mode, then enforce once you have tuned it to your assets.