HTTP Headers Analysis for https://fastmailcdn.com

Detected Technologies from Headers

See all in URL Inspect 4

Cloudflare NEL Monitoring

Gravatar

Cloudflare CDN

Libsyn

HTTP Security Headers

Status

Strict-Transport-Security

Excellent

max-age=31536000; includeSubDomains; preload

Content-Security-Policy

Basic

default-src; script-src; style-src; +5 more 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

accelerometer=(), ambient-light-sensor=(), battery=(); +17 more

Recommendations

• Improve CSP by adding more specific directives and removing 'unsafe-inline'

Performance Headers

Connection

Performance

close

connection: close

Caching Headers

Cache-Control

Caching

public, max-age=0, must-revalidate

Etag

Caching

"a792c4c4dec029fcbf5dc425246d07a8"

cache-control: public, max-age=0, must-revalidate
etag: "a792c4c4dec029fcbf5dc425246d07a8"

Content Headers

Content-Length

Content

105339

Content-Type

Content

text/html; charset=utf-8

content-length: 105339
content-type: text/html; charset=utf-8

Server Headers

Server

cloudflare

server: cloudflare

CORS Headers

Access-Control-Allow-Origin

Cors

*

access-control-allow-origin: *

Cookies Headers

Set-Cookie

Cookies

set-cookie: campaign=homepage%3A1775590678%3A3; Domain=fastmail.com; Path=/; SameSite=Lax; Max-age=31536000; Secure;

Other Headers

Accept-Ch

Other

Sec-CH-UA-Arch, Sec-CH-UA-Bitness

Alt-Svc

Other

h3=":443"; ma=86400

Cf-Ray

Other

9e8b7d6a1ef382ea-IAD

Date

Other

Tue, 07 Apr 2026 19:37:58 GMT

Nel

Other

Report-To Group cf-nel max-age: 1w

success: 0.0%

Report-To

Other

Group cf-nel max-age: 1w

Endpoint 1 https://a.nel.cloudflare.com/report/v4?s=JQ3PWfXWwDD9azFoDscBRnoPUWDcDM8VraE7VYiG9lnPijzUA0mP95WJbzEMGhL22wm96n%2Fyue6m20xrJjowpaunJHnkTEAzvCwevNAxs%2FVXes52pq%2BEKDnL1H89VFVjpXeJ

accept-ch: Sec-CH-UA-Arch, Sec-CH-UA-Bitness
alt-svc: h3=":443"; ma=86400
cf-ray: 9e8b7d6a1ef382ea-IAD
date: Tue, 07 Apr 2026 19:37:58 GMT
nel: {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
report-to: {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=JQ3PWfXWwDD9azFoDscBRnoPUWDcDM8VraE7VYiG9lnPijzUA0mP95WJbzEMGhL22wm96n%2Fyue6m20xrJjowpaunJHnkTEAzvCwevNAxs%2FVXes52pq%2BEKDnL1H89VFVjpXeJ"}]}

Recommendations

Enable compression (gzip/brotli) to improve performance