HTTP Headers Analysis for https://northflank.com

Detected Technologies from Headers

See all in URL Inspect 10

Ashby

Cal.com

Envoy

Google Fonts

Google Search

Google Static File Front End

UnifyGTM

Varnish

Express

Google Cloud

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=31557600

Content-Security-Policy

Good

default-src; frame-ancestors; frame-src; +7 more Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Good

SAMEORIGIN

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
• Strengthen CSP by removing 'unsafe-eval'
• 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

Accept-Ranges

Performance

bytes

Connection

Performance

close

Vary

Performance

Accept-Encoding

accept-ranges: bytes
connection: close
vary: Accept-Encoding

Caching Headers

Age

Caching

0

Cache-Control

Caching

public, max-age=0, must-revalidate

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

Content Headers

Content-Length

Content

70418

Content-Type

Content

text/html; charset=utf-8

content-length: 70418
content-type: text/html; charset=utf-8

Server Headers

Server

istio-envoy

X-Powered-By

Server

Express

server: istio-envoy
x-powered-by: Express

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Date

Other

Sat, 09 May 2026 04:42:19 GMT

Via

Other

1.1 varnish, 1.1 varnish

X-Cache

Other

MISS, MISS

X-Cache-Hits

Other

0, 0

X-Envoy-Upstream-Service-Time

Other

10

X-Served-By

Other

cache-lhr-egll1980076-LHR, cache-iad-kcgs7200154-IAD

X-Timer

Other

S1778301739.157531,VS0,VE94

date: Sat, 09 May 2026 04:42:19 GMT
via: 1.1 varnish, 1.1 varnish
x-cache: MISS, MISS
x-cache-hits: 0, 0
x-envoy-upstream-service-time: 10
x-served-by: cache-lhr-egll1980076-LHR, cache-iad-kcgs7200154-IAD
x-timer: S1778301739.157531,VS0,VE94

Recommendations

Enable compression (gzip/brotli) to improve performance

Consider removing X-Powered-By header to hide server technology