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

Detected Technologies from Headers

See all in URL Inspect 1

Cloudflare CDN

HTTP Security Headers

Status

Strict-Transport-Security

Good

max-age=63072000; includeSubDomains

Content-Security-Policy

Good

default-src; frame-ancestors Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Excellent

DENY

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Good

strict-origin-when-cross-origin

Permissions-Policy

Present

camera=(), microphone=(), geolocation=(); +1 more

Recommendations

• Consider adding 'preload' to HSTS for maximum security
• Strengthen CSP by removing 'unsafe-eval'

Performance Headers

Connection

Performance

close

connection: close

Caching Headers

Etag

Caching

W/"f-51rzdr5zfwWQpf+iUepheZg7siQ"

etag: W/"f-51rzdr5zfwWQpf+iUepheZg7siQ"

Content Headers

Content-Length

Content

15

Content-Type

Content

application/json; charset=utf-8

content-length: 15
content-type: application/json; charset=utf-8

Server Headers

Server

cloudflare

server: cloudflare

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Cf-Cache-Status

Other

DYNAMIC

Cf-Ray

Other

9f7db81c0d804521-ATL

Date

Other

Thu, 07 May 2026 05:10:36 GMT

cf-cache-status: DYNAMIC
cf-ray: 9f7db81c0d804521-ATL
date: Thu, 07 May 2026 05:10:36 GMT

Recommendations

Enable compression (gzip/brotli) to improve performance

Add Cache-Control header to optimize caching