DNS Gurus
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21 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

2 headers
Connection
Performance
close
Transfer-Encoding
Performance
chunked

Caching Headers

0 headers
No caching headers found

Content Headers

1 headers
Content-Type
Content
text/html

Server Headers

1 headers
Server
Server
cloudflare

CORS Headers

4 headers
Access-Control-Allow-Credentials
Cors
true
Access-Control-Allow-Headers
Cors
content-type
Access-Control-Allow-Methods
Cors
GET, POST, PUT, DELETE, OPTIONS, TRACE, PATCH, PURGE, HEAD, QUERY
Access-Control-Allow-Origin
Cors
*

Cookies Headers

1 headers
Set-Cookie
Cookies
http4k-clientId="b9fafa7e-a5fc-424e-a1ed-0a1d0e2a45f6"; Max-Age=9223372036854775807; Path=/; HttpOnly

Other Headers

12 headers
Alt-Svc
Other
h3=":443"; ma=86400
Cf-Cache-Status
Other
DYNAMIC
Cf-Ray
Other
9bd55bbddecec5b6-IAD
Date
Other
Tue, 13 Jan 2026 13:49:41 GMT
Nel
Other
{"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
Report-To
Other
{"group":"heroku-nel","endpoints":[{"url":"https://nel.heroku.com/reports?s=oSIakTrWPDTgExbnjRHcD54J%2BUexKc5w33H4lqfO7S8%3D\u0026sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add\u0026ts=1768312181"}],"max_age":3600}
Reporting-Endpoints
Other
heroku-nel="https://nel.heroku.com/reports?s=oSIakTrWPDTgExbnjRHcD54J%2BUexKc5w33H4lqfO7S8%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1768312181"
Server-Timing
Other
cfEdge;dur=21,cfOrigin;dur=36
Via
Other
2.0 heroku-router
X-B3-Sampled
Other
1
X-B3-Spanid
Other
d50d711c15633ce1
X-B3-Traceid
Other
ebb4226679b96a86

Recommendations

Enable compression (gzip/brotli) to improve performance

Add Cache-Control header to optimize caching