DNS Gurus
Cached · just now
22 Headers

HTTP Security Headers

Status
Strict-Transport-Security
Missing
Not configured
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Missing
Not configured
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Add Strict-Transport-Security header with max-age of at least 1 year
  • • Add Content-Security-Policy header to prevent XSS attacks
  • • 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
Accept-Ranges
Performance
bytes
Connection
Performance
close
Vary
Performance
Accept-Encoding

Caching Headers

4 headers
Cache-Control
Caching
max-age=600
Etag
Caching
"655cb221-1a88"
Expires
Caching
Wed, 21 Jan 2026 13:41:30 GMT
Last-Modified
Caching
Tue, 21 Nov 2023 13:35:29 GMT

Content Headers

2 headers
Content-Length
Content
6792
Content-Type
Content
text/html; charset=utf-8

Server Headers

1 headers
Server
Server
GitHub.com

CORS Headers

1 headers
Access-Control-Allow-Origin
Cors
*

Cookies Headers

0 headers
No cookies headers found

Other Headers

11 headers
Date
Other
Wed, 21 Jan 2026 13:31:30 GMT
Via
Other
1.1 varnish, 1.1 3e36dd267cb267a1625f6ecf58fe0bd2.cloudfront.net (CloudFront)
X-Amz-Cf-Id
Other
AyNs2fmTeLsoWmveObEnIRoZWYk7AeqVV0i1EuGOBDhTw76GrHWFeQ==
X-Amz-Cf-Pop
Other
IAD61-P12
X-Cache
Other
RefreshHit from cloudfront
X-Cache-Hits
Other
0
X-Fastly-Request-Id
Other
b99f47c24261abc16cd3fa26ff448142ba39bb22
X-Github-Request-Id
Other
0CF6:34777D:383696E:3D62928:696F1505
X-Proxy-Cache
Other
MISS
X-Served-By
Other
cache-iad-kcgs7200103-IAD
X-Timer
Other
S1768887558.635714,VS0,VE15

Recommendations

Enable compression (gzip/brotli) to improve performance