HTTP Headers Analysis for https://learn.circle.com

Detected Technologies from Headers

See all in URL Inspect 3

Cloudflare CDN

Next.js

Vercel

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=63072000

Content-Security-Policy

Weak

worker-src; object-src; base-uri; +3 more Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

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
• Significantly strengthen CSP directives
• 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

Connection

Performance

close

Transfer-Encoding

Performance

chunked

Vary

Performance

rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch, accept-encoding

connection: close
transfer-encoding: chunked
vary: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch, accept-encoding

Caching Headers

Age

Caching

56552

Cache-Control

Caching

no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0

Expires

Caching

0

Pragma

Caching

no-cache

age: 56552
cache-control: no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0
expires: 0
pragma: no-cache

Content Headers

Content-Type

Content

text/html; charset=utf-8

content-type: text/html; charset=utf-8

Server Headers

Server

cloudflare

X-Version

Server

dpl_4Pr9EEQkSXLeBM81dcXJGwHd4Qbd

server: cloudflare
x-version: dpl_4Pr9EEQkSXLeBM81dcXJGwHd4Qbd

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Cf-Cache-Status

Other

HIT

Cf-Ray

Other

9f90efee1c9b28b8-IAD

Date

Other

Sat, 09 May 2026 13:09:12 GMT

Link

Other

URL /llms.txt

rel=llms-txt

URL /llms-full.txt

rel=llms-full-txt

Server-Timing

Other

cfCacheStatus;desc="HIT", cfEdge;dur=4,cfOrigin;dur=0,cfWorker;dur=25

X-Llms-Txt

Other

/llms.txt

X-Matched-Path

Other

/_sites/[subdomain]/[[...slug]]

X-Mint-Proxy-Version

Other

1.0.0-prod

X-Mintlify-Client-Version

Other

0.0.2893

X-Nextjs-Prerender

Other

1

X-Nextjs-Stale-Time

Other

60

X-Served-Version

Other

dpl_4Pr9EEQkSXLeBM81dcXJGwHd4Qbd

X-Vercel-Cache

Other

REVALIDATED

X-Vercel-Id

Other

iad1::iad1::ftkh6-1778275597508-d34e8237353e

X-Vercel-Project-Id

Other

prj_3kakCEKDVpOxnQIJmKyTWs83RXEa

cf-cache-status: HIT
cf-ray: 9f90efee1c9b28b8-IAD
date: Sat, 09 May 2026 13:09:12 GMT
link: </llms.txt>; rel="llms-txt", </llms-full.txt>; rel="llms-full-txt"
server-timing: cfCacheStatus;desc="HIT", cfEdge;dur=4,cfOrigin;dur=0,cfWorker;dur=25
x-llms-txt: /llms.txt
x-matched-path: /_sites/[subdomain]/[[...slug]]
x-mint-proxy-version: 1.0.0-prod
x-mintlify-client-version: 0.0.2893
x-nextjs-prerender: 1
x-nextjs-stale-time: 60
x-served-version: dpl_4Pr9EEQkSXLeBM81dcXJGwHd4Qbd
x-vercel-cache: REVALIDATED
x-vercel-id: iad1::iad1::ftkh6-1778275597508-d34e8237353e
x-vercel-project-id: prj_3kakCEKDVpOxnQIJmKyTWs83RXEa

Recommendations

Enable compression (gzip/brotli) to improve performance