Are security headers missing - see status codes and HSTS before scanners flag your site.
200, 301, 404 - is the server responding as expected?
HSTS, CSP, X-Frame-Options - are protections present?
Redirect chain, Cache-Control, and server type at a glance
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Response headers and security flags explained
Missing HTTP security headers such as HSTS and CSP leave your site open to clickjacking, XSS, and HTTPS downgrade attacks - security scanners flag these gaps before many teams notice.
An HTTP headers checker sends a request to your URL and shows the status code, full response headers, redirect chain, and security flags the server actually returns. A free HTTP headers check helps you verify protections after deploys, CDN changes, or SSL rollouts.
Run a one-time check on the exact URL visitors use - including www and API paths. Add URLs to TotalSiteControl monitoring for alerts when status codes or critical headers change.
Free TotalSiteControl monitoring - email alerts, no credit card required.
Get notified when HSTS, CSP, X-Frame-Options, or status codes change.
Track response headers from our servers - catch CDN or config drift early.
See past results for debugging, compliance audits, and post-mortems.
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It sends a request to a URL and shows the response status code, headers, redirects, and security-related flags like HSTS and CSP.
Yes. Check any public URL and get instant results - no signup, no credit card, and no limit on one-off checks.
Start with HSTS, Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options. Missing headers leave browsers with weaker default protection.
Strict-Transport-Security tells browsers to use HTTPS only for your domain, reducing downgrade attacks after SSL is enabled.
Common causes include HTTP to HTTPS upgrades, www canonicalization, and trailing-slash rules. See the redirect chain in results or use our URL Redirect Checker.
Yes - any public HTTP or HTTPS URL, including paths on api.yoursite.com or other subdomains.
This tool shows all response headers and security flags. The redirect checker focuses only on hop-by-hop status codes and Location headers.
After deploys, CDN changes, or security hardening. Monitoring catches header drift before it affects users or SEO.