DNS Gurus

SSL Verification Bypassed

The server's SSL certificate could not be verified. The analysis was completed using insecure mode. Data may be less reliable.

Reason:

Hostname Mismatch - certificate is issued for *.github.io, *.github.com, *.githubusercontent.com, github.com, github.io, githubusercontent.com, www.github.com, not for www.dev.devfest.it

Cached · just now
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

3 headers
Accept-Ranges
Performance
bytes
Connection
Performance
close
Vary
Performance
Accept-Encoding

Caching Headers

5 headers
Age
Caching
0
Cache-Control
Caching
max-age=600
Etag
Caching
"68c17175-118e0"
Expires
Caching
Thu, 15 Jan 2026 19:22:56 GMT
Last-Modified
Caching
Wed, 10 Sep 2025 12:39:17 GMT

Content Headers

2 headers
Content-Length
Content
71904
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

9 headers
Date
Other
Thu, 15 Jan 2026 19:12:56 GMT
Via
Other
1.1 varnish
X-Cache
Other
MISS
X-Cache-Hits
Other
0
X-Fastly-Request-Id
Other
07795eeffa46347c567b2a32a1164d5ab4ebb2ae
X-Github-Request-Id
Other
9615:1A1C37:6D717D:7975C8:69693C37
X-Proxy-Cache
Other
MISS
X-Served-By
Other
cache-nyc-kteb1890042-NYC
X-Timer
Other
S1768504376.469808,VS0,VE38

Recommendations

Enable compression (gzip/brotli) to improve performance