DNS Gurus
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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

1 headers
Connection
Performance
close

Caching Headers

2 headers
Cache-Control
Caching
private
Etag
Caching
W/"f-VaSQ4oDUiZblZNAEkkN+sX+q3Sg"

Content Headers

2 headers
Content-Length
Content
15
Content-Type
Content
application/json; charset=utf-8

Server Headers

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

CORS Headers

2 headers
Access-Control-Allow-Headers
Cors
authorization,content-type,baggage,sentry-trace,x-api-key
Access-Control-Allow-Origin
Cors
https://opencollective.com

Cookies Headers

0 headers
No cookies headers found

Other Headers

13 headers
Alt-Svc
Other
h3=":443"; ma=86400
Cf-Cache-Status
Other
DYNAMIC
Cf-Ray
Other
9c9c7f9a0a183450-IAD
Date
Other
Fri, 06 Feb 2026 17:51:56 GMT
Nel
Other
{"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
Ratelimit-Limit
Other
100
Ratelimit-Policy
Other
100;w=900
Ratelimit-Remaining
Other
99
Ratelimit-Reset
Other
900
Report-To
Other
{"group":"heroku-nel","endpoints":[{"url":"https://nel.heroku.com/reports?s=j%2Ff78EPeD%2BOAmnasJC%2FnzI9QUDLIwXny7nVtfBZBpmc%3D\u0026sid=e11707d5-02a7-43ef-b45e-2cf4d2036f7d\u0026ts=1770400316"}],"max_age":3600}
Reporting-Endpoints
Other
heroku-nel="https://nel.heroku.com/reports?s=j%2Ff78EPeD%2BOAmnasJC%2FnzI9QUDLIwXny7nVtfBZBpmc%3D&sid=e11707d5-02a7-43ef-b45e-2cf4d2036f7d&ts=1770400316"
Server-Timing
Other
cfEdge;dur=18,cfOrigin;dur=11
Via
Other
2.0 heroku-router

Recommendations

Enable compression (gzip/brotli) to improve performance

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