HTTP Headers Analysis for https://opentopodata.org

Detected Technologies from Headers

See all in URL Inspect 5

Cloudflare NEL Monitoring

Cloudflare CDN

Fastly

GitHub

Varnish

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=15552000; 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

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

0

Cache-Control

Caching

max-age=600

Expires

Caching

Thu, 02 Apr 2026 12:46:14 GMT

Last-Modified

Caching

Fri, 11 Oct 2024 20:18:30 GMT

age: 0
cache-control: max-age=600
expires: Thu, 02 Apr 2026 12:46:14 GMT
last-modified: Fri, 11 Oct 2024 20:18:30 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

Access-Control-Allow-Origin

Cors

*

access-control-allow-origin: *

Cookies Headers

No cookies headers found

Other Headers

Alt-Svc

Other

h3=":443"; ma=86400

Cf-Cache-Status

Other

DYNAMIC

Cf-Ray

Other

9e5fea874dfe05ac-IAD

Date

Other

Thu, 02 Apr 2026 12:42:54 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=vqOLY866%2F4smj%2F%2Bo%2FkU%2BamimkOlAAIWZ991bnkEhdIog%2BAmZaEL01QWZOp9TB7XUfAnyY%2B5kX0Dl4ZRIsrFIoITo3RZ4JKGi8xaW0GP27vGLN%2BG7D5OsNstmweW%2BPb3B9QRmxkpjcg%3D%3D

Server-Timing

Other

cfCacheStatus;desc="DYNAMIC", cfEdge;dur=24,cfOrigin;dur=17

Via

Other

1.1 varnish

X-Cache

Other

HIT

X-Cache-Hits

Other

0

X-Fastly-Request-Id

Other

e08579e56014ca016a70417815807a288dc94b8d

X-Github-Request-Id

Other

B636:19F46A:D89E4B:ED85F4:69CE62BD

X-Proxy-Cache

Other

MISS

X-Served-By

Other

cache-iad-kiad7000043-IAD

X-Timer

Other

S1775133774.992073,VS0,VE15

alt-svc: h3=":443"; ma=86400
cf-cache-status: DYNAMIC
cf-ray: 9e5fea874dfe05ac-IAD
date: Thu, 02 Apr 2026 12:42:54 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=vqOLY866%2F4smj%2F%2Bo%2FkU%2BamimkOlAAIWZ991bnkEhdIog%2BAmZaEL01QWZOp9TB7XUfAnyY%2B5kX0Dl4ZRIsrFIoITo3RZ4JKGi8xaW0GP27vGLN%2BG7D5OsNstmweW%2BPb3B9QRmxkpjcg%3D%3D"}]}
server-timing: cfCacheStatus;desc="DYNAMIC", cfEdge;dur=24,cfOrigin;dur=17
via: 1.1 varnish
x-cache: HIT
x-cache-hits: 0
x-fastly-request-id: e08579e56014ca016a70417815807a288dc94b8d
x-github-request-id: B636:19F46A:D89E4B:ED85F4:69CE62BD
x-proxy-cache: MISS
x-served-by: cache-iad-kiad7000043-IAD
x-timer: S1775133774.992073,VS0,VE15

Recommendations

Enable compression (gzip/brotli) to improve performance