HSTS header missing
The site does not tell browsers to always use HTTPS.
- Strict-Transport-Security
- (not set)
Strict-Transport-Security: max-age=31536000; includeSubDomains once every subdomain supports HTTPS.Why it matters ↓Why it matters ↑
HSTS tells browsers to never load the site over HTTP again, closing the downgrade window that the redirect alone leaves open.
How we check: Reads the Strict-Transport-Security header on the HTTPS response and checks max-age is at least 180 days.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security