DNS Gurus
Cached · just now
19 Headers

HTTP Security Headers

Status
Strict-Transport-Security
Excellent
max-age=31536000; includeSubDomains; preload
Content-Security-Policy
Weak
frame-ancestors
X-Frame-Options
Missing
Not configured
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Significantly strengthen CSP directives
  • • Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
  • • 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

1 headers
Cache-Control
Caching
no-cache

Content Headers

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

Server Headers

2 headers
Server
Server
cloudflare
X-Powered-By
Server
Express

CORS Headers

0 headers
No CORS headers found

Cookies Headers

1 headers
Set-Cookie
Cookies
__cf_bm=abgsXiDvp1vR3RQiqQ8PQjfxhMnlaK09xScCFRWpS.A-1769877153-1.0.1.1-aeoNZogEpwmCyihfPzbgvIsDXoRP3yaMEqmrgI4wgWz8k1x00TasHIRM_85cKEUaXWMHng644oiR9xpkAgWAVdhnI3Em5cW.KD5ltEq.UNw; path=/; expires=Sat, 31-Jan-26 17:02:33 GMT; domain=.substack.com; HttpOnly; Secure; SameSite=None

Other Headers

9 headers
Alt-Svc
Other
h3=":443"; ma=86400
Cf-Cache-Status
Other
EXPIRED
Cf-Ray
Other
9c6a9b1199d40853-IAD
Date
Other
Sat, 31 Jan 2026 16:32:33 GMT
Link
Other
<https://substackcdn.com>; rel=preconnect
X-Cluster
Other
substack
X-Deploy
Other
a5cdc745fb
X-Served-By
Other
Substack
X-Service
Other
web

Recommendations

Enable compression (gzip/brotli) to improve performance

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