HTTP Headers Analysis for https://api.calendly.com

Detected Technologies from Headers

See all in URL Inspect 1

Cloudflare CDN

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

Good

nosniff

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 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

Accept-Encoding

connection: close
transfer-encoding: chunked
vary: Accept-Encoding

Caching Headers

No caching headers found

Content Headers

Content-Type

Content

application/json; charset=utf-8

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

Server Headers

Server

cloudflare

server: cloudflare

CORS Headers

No CORS headers found

Cookies Headers

Set-Cookie

Cookies

set-cookie: __cf_bm=ztFFoJ71wGnCMUTAYAHzyLGrdHFwTem5D6XnKi2lDqc-1775237683.7489567-1.0.1.1-jy7VWrx6tp6aysZUCf9nxrpGNMBN5SiwhjLK3HzJwDtGputlDHiqHFK5ZG7v2r_LjoOUjuCYQakn7N0Tonx27qSQz1dl1mov9l3neeeJAORY_w7Ib2A1Bkpuj5Wa1N.8; HttpOnly; Secure; Path=/; Domain=calendly.com; Expires=Fri, 03 Apr 2026 18:04:43 GMT
_cfuvid=n5vh1MOo6uqkgcAYwMgICz39v2nRwrRnE4wCABqcoqk-1775237683.7489567-1.0.1.1-Gv252yXTKRYMCaKCe.Hni5hWvQhUWlRVtnr6tRSJ_18; HttpOnly; SameSite=None; Secure; Path=/; Domain=calendly.com

Other Headers

Cf-Cache-Status

Other

DYNAMIC

Cf-Ray

Other

9e69d3636d7632a5-IAD

Date

Other

Fri, 03 Apr 2026 17:34:43 GMT

cf-cache-status: DYNAMIC
cf-ray: 9e69d3636d7632a5-IAD
date: Fri, 03 Apr 2026 17:34:43 GMT

Recommendations

Enable compression (gzip/brotli) to improve performance

Add Cache-Control header to optimize caching