DNS Gurus
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20 Headers

HTTP Security Headers

Status
Strict-Transport-Security
Present
max-age=31536000
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
  • • Increase HSTS max-age to at least 1 year and add includeSubDomains
  • • 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=7yK.9iUpvr5tAqONVMjyHbu.I8UiHPj0t3O1N0KyZO4-1767109408-1.0.1.1-CpewAmGy0AYxUhy.Vr52owJXjKD.qYylf1fYiJdfh5NaZ3cL8K7rskL16.OB11QbXDM2xsWRrjCfXg4u66LLZ.m9ztaOKYUNJJ4vWL9yq54; path=/; expires=Tue, 30-Dec-25 16:13:28 GMT; domain=.substack.com; HttpOnly; Secure; SameSite=None

Other Headers

10 headers
Alt-Svc
Other
h3=":443"; ma=86400
Cf-Cache-Status
Other
EXPIRED
Cf-Ray
Other
9b62a7270cd5c95f-IAD
Date
Other
Tue, 30 Dec 2025 15:43:28 GMT
Link
Other
<https://substackcdn.com>; rel=preconnect
X-Cluster
Other
substack
X-Deploy
Other
66ab330854
X-Served-By
Other
Substack
X-Service
Other
web
X-Sub
Other
chrissush

Recommendations

Enable compression (gzip/brotli) to improve performance

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