DNS Gurus
Cached · just now
18 Headers

HTTP Security Headers

Status
Strict-Transport-Security
Excellent
max-age=63072000; includeSubDomains; preload
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • 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,Cookie

Caching Headers

1 headers
Cache-Control
Caching
max-age=600, must-revalidate

Content Headers

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

Server Headers

2 headers
Server
Server
cloudflare
X-Powered-By
Server
WP Engine

CORS Headers

0 headers
No CORS headers found

Cookies Headers

1 headers
Set-Cookie
Cookies
__cf_bm=_2YxZPeTlfyg9Ch_kj0ERi8T0YxBBAMukKu.N2bgojg-1770281000-1.0.1.1-d49W3B1l3fBCJXK.RVV1e8Mmufikgn75wWNuRmHTW9CrPqxsIQyAPvdGMXSI3M.GjJEJ.IN.YKL7M4YsSZtfdXW0bN24uDyZyCl4FOTg00k; path=/; expires=Thu, 05-Feb-26 09:13:20 GMT; domain=.www.zybooks.com; HttpOnly; Secure; SameSite=None

Other Headers

8 headers
Alt-Svc
Other
h3=":443"; ma=86400
Cf-Cache-Status
Other
DYNAMIC
Cf-Ray
Other
9c911e9d09052076-IAD
Date
Other
Thu, 05 Feb 2026 08:43:20 GMT
Link
Other
<https://www.zybooks.com/>; rel=shortlink
X-Cache
Other
HIT: 2
X-Cache-Group
Other
normal
X-Cacheable
Other
SHORT

Recommendations

Enable compression (gzip/brotli) to improve performance

Consider removing X-Powered-By header to hide server technology