HTTP Headers Analysis for https://data.jsdelivr.com

Detected Technologies from Headers

See all in URL Inspect 1

Varnish

HTTP Security Headers

Status

Strict-Transport-Security

Missing

Not configured

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 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

Accept-Ranges

Performance

bytes

Connection

Performance

close

Vary

Performance

Accept-Encoding

accept-ranges: bytes
connection: close
vary: Accept-Encoding

Caching Headers

Cache-Control

Caching

no-cache, no-store, must-revalidate

cache-control: no-cache, no-store, must-revalidate

Content Headers

Content-Length

Content

131

Content-Type

Content

application/json; charset=utf-8

content-length: 131
content-type: application/json; charset=utf-8

Server Headers

No server headers found

CORS Headers

Access-Control-Allow-Origin

Cors

*

Access-Control-Expose-Headers

Cors

*

access-control-allow-origin: *
access-control-expose-headers: *

Cookies Headers

No cookies headers found

Other Headers

Alt-Svc

Other

h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=86400

Date

Other

Fri, 11 Sep 2026 04:43:50 GMT

Link

Other

URL https://data.jsdelivr.com/v1/spec.yaml

rel=service-desc type=application/yaml

URL https://www.jsdelivr.com/docs/data.jsdelivr.com

rel=service-doc type=text/html

Timing-Allow-Origin

Other

*

Via

Other

1.1 varnish

X-Cache

Other

MISS

X-Response-Time

Other

0ms

X-Robots-Tag

Other

noindex

X-Served-By

Other

cache-nyc-kteb1890055-NYC

X-Timer

Other

S1789101830.240371,VS0,VE284

alt-svc: h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=86400
date: Fri, 11 Sep 2026 04:43:50 GMT
link: <https://data.jsdelivr.com/v1/spec.yaml>; rel="service-desc"; type="application/yaml", <https://www.jsdelivr.com/docs/data.jsdelivr.com>; rel="service-doc"; type="text/html"
timing-allow-origin: *
via: 1.1 varnish
x-cache: MISS
x-response-time: 0ms
x-robots-tag: noindex
x-served-by: cache-nyc-kteb1890055-NYC
x-timer: S1789101830.240371,VS0,VE284

Recommendations

Enable compression (gzip/brotli) to improve performance