HTTP Headers Analysis for https://docs.yubico.com

Detected Technologies from Headers

See all in URL Inspect 2

Nginx

Varnish

HTTP Security Headers

Status

Strict-Transport-Security

Excellent

max-age=31536000; includeSubDomains; preload

Content-Security-Policy

Missing

Not configured Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

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 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

Accept-Ranges

Performance

bytes

Connection

Performance

close

accept-ranges: bytes
connection: close

Caching Headers

Age

Caching

0

Etag

Caching

"69ccf146-3ba7"

Last-Modified

Caching

Wed, 01 Apr 2026 10:19:50 GMT

age: 0
etag: "69ccf146-3ba7"
last-modified: Wed, 01 Apr 2026 10:19:50 GMT

Content Headers

Content-Length

Content

15271

Content-Type

Content

text/html

content-length: 15271
content-type: text/html

Server Headers

Server

nginx

server: nginx

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Date

Other

Sat, 11 Apr 2026 23:44:03 GMT

Via

Other

1.1 google, 1.1 varnish

X-Cache

Other

MISS

X-Cache-Hits

Other

0

X-Served-By

Other

cache-ewr-kewr1740033-EWR

X-Timer

Other

S1775951044.547547,VS0,VE54

date: Sat, 11 Apr 2026 23:44:03 GMT
via: 1.1 google, 1.1 varnish
x-cache: MISS
x-cache-hits: 0
x-served-by: cache-ewr-kewr1740033-EWR
x-timer: S1775951044.547547,VS0,VE54

Recommendations

Enable compression (gzip/brotli) to improve performance

Add Cache-Control header to optimize caching