HTTP Headers Analysis for https://markdejong.org

Detected Technologies from Headers

See all in URL Inspect 3

Cloudflare NEL Monitoring

Cloudflare CDN

Netlify

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=31536000

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

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
• Add Content-Security-Policy header to prevent XSS attacks
• Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
• 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

Accept-Encoding

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

Caching Headers

Age

Caching

2

Cache-Control

Caching

no-cache

age: 2
cache-control: no-cache

Content Headers

Content-Type

Content

text/html

content-type: text/html

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

Cache-Status

Other

"Netlify Durable"; fwd=bypass, "Netlify Edge"; fwd=miss

Cf-Cache-Status

Other

DYNAMIC

Cf-Ray

Other

9e91c5eb9d53e60f-IAD

Date

Other

Wed, 08 Apr 2026 13:56:04 GMT

Nel

Other

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

success: 0.0%

Netlify-Vary

Other

query

Report-To

Other

Group cf-nel max-age: 1w

Endpoint 1 https://a.nel.cloudflare.com/report/v4?s=kgpEgklVSy3ktgZVrQ9vF5gjODBxUThuyH8JEMTs2a%2FWhjHhEm0gFPboXetqy7aNEYAEnQTBgTs4yfBC%2FqDgao5JZucmILu4tVTylz1u6fm5gc%2F4FOeYlOkeek%2FnFzIb8Q%3D%3D

Server-Timing

Other

cfCacheStatus;desc="DYNAMIC", cfEdge;dur=51,cfOrigin;dur=2155

X-Nf-Request-Id

Other

01KNPP1VZVABKX5HNB8HHZVKKC

alt-svc: h3=":443"; ma=86400
cache-status: "Netlify Durable"; fwd=bypass, "Netlify Edge"; fwd=miss
cf-cache-status: DYNAMIC
cf-ray: 9e91c5eb9d53e60f-IAD
date: Wed, 08 Apr 2026 13:56:04 GMT
nel: {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
netlify-vary: query
report-to: {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=kgpEgklVSy3ktgZVrQ9vF5gjODBxUThuyH8JEMTs2a%2FWhjHhEm0gFPboXetqy7aNEYAEnQTBgTs4yfBC%2FqDgao5JZucmILu4tVTylz1u6fm5gc%2F4FOeYlOkeek%2FnFzIb8Q%3D%3D"}]}
server-timing: cfCacheStatus;desc="DYNAMIC", cfEdge;dur=51,cfOrigin;dur=2155
x-nf-request-id: 01KNPP1VZVABKX5HNB8HHZVKKC

Recommendations

Enable compression (gzip/brotli) to improve performance