DNS Gurus

SSL Verification Bypassed

The server's SSL certificate could not be verified. The analysis was completed using insecure mode. Data may be less reliable.

Reason:

Hostname Mismatch - certificate is issued for *.netlify.app, netlify.app, not for extensionschool.ch

Cached · just now
14 Headers

HTTP Security Headers

Status
Strict-Transport-Security
Present
max-age=31536000
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Excellent
DENY
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Increase HSTS max-age to at least 1 year and add includeSubDomains
  • • Add Content-Security-Policy header to prevent XSS attacks
  • • Add X-Content-Type-Options: nosniff
  • • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
  • • Consider adding Permissions-Policy to control browser features

Performance Headers

3 headers
Connection
Performance
close
Transfer-Encoding
Performance
chunked
Vary
Performance
accept-encoding

Caching Headers

2 headers
Cache-Control
Caching
max-age=300
Last-Modified
Caching
Sat, 31 Jan 2026 16:31:36 GMT

Content Headers

1 headers
Content-Type
Content
text/html; charset=UTF-8

Server Headers

1 headers
Server
Server
cloudflare

CORS Headers

0 headers
No CORS headers found

Cookies Headers

0 headers
No cookies headers found

Other Headers

5 headers
Cf-Cache-Status
Other
EXPIRED
Cf-Ray
Other
9c6a99a8ba349c64-IAD
Content-Security-Policy-Report-Only
Other
default-src 'self' 'unsafe-inline' *.epfl.ch; script-src 'self' 'unsafe-inline' 'unsafe-eval' *.epfl.ch https://*.cast.switch.ch https://ajax.googleapis.com https://cdnjs.cloudflare.com https://connect.facebook.net https://platform.twitter.com https://player.vimeo.com https://www.google-analytics.com https://www.googletagmanager.com https://www.instagram.com https://www.youtube.com; object-src 'none'; connect-src 'self' *.epfl.ch https://*.cast.switch.ch https://*.cloudfront.net https://*.google-analytics.com https://api.cdnjs.com https://stats.g.doubleclick.net https://www.google-analytics.com; frame-src 'self' *.epfl.ch https://api.cast.switch.ch https://datawrapper.dwcdn.net https://platform.twitter.com https://player.vimeo.com https://www.instagram.com https://www.youtube.com; style-src-elem 'self' 'unsafe-inline' *.epfl.ch https://fonts.googleapis.com; font-src 'self' data: *.epfl.ch https://fonts.gstatic.com; media-src 'self' data: *.epfl.ch https://*.cloudfront.net; img-src * data: https://s.w.org https://syndication.twitter.com https://www.google-analytics.com; worker-src 'none' blob:; report-uri https://report-uri.epfl.ch/csp-report;
Date
Other
Sat, 31 Jan 2026 16:31:36 GMT
Link
Other
<https://www.epfl.ch/education/continuing-education/>; rel=shortlink

Recommendations

Enable compression (gzip/brotli) to improve performance