HTTP Headers Analysis for https://sendmarc.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

Good

SAMEORIGIN

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Present

same-origin

Permissions-Policy

Missing

Not configured

Recommendations

• Add Content-Security-Policy header to prevent XSS attacks
• 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

Cache-Control

Caching

max-age=0

Expires

Caching

Sun, 12 Apr 2026 14:24:26 GMT

Last-Modified

Caching

Sat, 11 Apr 2026 10:05:53 GMT

cache-control: max-age=0
expires: Sun, 12 Apr 2026 14:24:26 GMT
last-modified: Sat, 11 Apr 2026 10:05:53 GMT

Content Headers

Content-Type

Content

text/html; charset=UTF-8

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

Server Headers

Server

cloudflare

server: cloudflare

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Alt-Svc

Other

h3=":443"; ma=86400

Cf-Cache-Status

Other

DYNAMIC

Cf-Ray

Other

9eb2e507ccd8c130-IAD

Date

Other

Sun, 12 Apr 2026 14:24:26 GMT

alt-svc: h3=":443"; ma=86400
cf-cache-status: DYNAMIC
cf-ray: 9eb2e507ccd8c130-IAD
date: Sun, 12 Apr 2026 14:24:26 GMT

Recommendations

Enable compression (gzip/brotli) to improve performance