DNS Gurus
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29 Headers

HTTP Security Headers

Status
Strict-Transport-Security
Present
max-age=2628000
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Excellent
DENY
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
  • • Add Content-Security-Policy header to prevent XSS attacks
  • • 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
Transfer-Encoding
Transfer-Encoding
Performance
chunked
Vary
Performance
Accept-Encoding, User-Agent

Caching Headers

1 headers
Cache-Control
Caching
private, max-age=0, no-cache, no-store, must-revalidate

Content Headers

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

Server Headers

1 headers
X-Powered-By
Server
Express

CORS Headers

0 headers
No CORS headers found

Cookies Headers

1 headers
Set-Cookie
Cookies
bm_sz=31F964307F1E343C76EDC965432D5EA5~YAAQCWncFzEMtQqcAQAA27HVHh4QdkFeOV2Tf/0UKEuwIKUmNc9dY6UmqhKa1LdIykLZnEnop9LRgdqBEJiHpuk3yeMS35yWqH7g3TGaunRKfFNbo5A3sDGqeO+5uYKbqD3RGoBKRRtF//S90cfyNjqApYEAXNbiwv0gAkhBjuEyo1DjUXJTkmv6JzDFOuM5NR3/FhSG4T9yCh6gDmTy5Yr2rBcAcRewYemv19iUOKZ0KleGCi3dDqAzCT2qeIEUaHtznVu6JUEq9+XXRfZdsx1FpPW9E6BHBNeZMuVen+D7A2A8N1vGYqkb/mfVGkxOnj2xMiGjKH2pEbnFbCxPwFW/R+GYct2rVR4XQ0cN~4538928~3356227; Domain=.groupon.pl; Path=/; Expires=Mon, 02 Feb 2026 18:50:44 GMT; Max-Age=14397

Other Headers

20 headers
Date
Other
Mon, 02 Feb 2026 14:50:47 GMT
Link
Other
<https://www2.grouponcdn.com/browse/assets/home_desktop-f7805b283e.css>; rel=preload; as=style, <https://www2.grouponcdn.com/browse/assets/home_desktop-7509b6ffb1.js>; rel=preload; as=script
Server-Timing
Other
rReq;dur=1994, rCon;dur=0, rHdr;dur=1994, hbi;dur=1969
X-Akamai-Transformed
Other
0 - 0 -
X-Application
Other
Pull-Itier
X-B-Cookie
Other
bc18d7ae-0850-4b5a-98d7-ae08500b5a12
X-B3-Traceid
Other
7f3914988d50468586ff1da76b030ee2
X-Destination
Other
tls_conveyor_pull_itier
X-Envoy-Upstream-Service-Time
Other
1997
X-External-Request-Id
Other
true
X-Forwarded-Proto
Other
https
X-Mtls-Upstream-Time
Other
1969
X-Original-Request-Id
Other
7f391498-8d50-4685-86ff-1da76b030ee2
X-Page-Id
Other
dde599ba-29fa-4ed6-a599-ba29fabed616-1770043844975-TH0
X-Request-Id
Other
7f391498-8d50-4685-86ff-1da76b030ee2,7f391498-8d50-4685-86ff-1da76b030ee2
X-Request-Originated-From
Other
envoy-tls-side-car--ingress-https
X-Response-Served-From
Other
routing-service--public--eu-west-1--conveyor-production49
X-S-Cookie
Other
dde599ba-29fa-4ed6-a599-ba29fabed616
X-Signifyd-Cookie
Other
39ef82aa-347b-4c50-af82-aa347b3c5017
X-Ua-Compatible
Other
IE=edge,chrome=1

Recommendations

Enable compression (gzip/brotli) to improve performance

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