HTTP Headers Analysis for https://dev.blockcypher.com

Detected Technologies from Headers

See all in URL Inspect 4

Cloudflare CDN

Fastly

GitHub

Varnish

HTTP Security Headers

Status

Strict-Transport-Security

Missing

Not configured

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

• Add Strict-Transport-Security header with max-age of at least 1 year
• 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

561

Cache-Control

Caching

max-age=600

Expires

Caching

Thu, 30 Apr 2026 22:39:36 GMT

Last-Modified

Caching

Thu, 30 Apr 2026 22:26:15 GMT

age: 561
cache-control: max-age=600
expires: Thu, 30 Apr 2026 22:39:36 GMT
last-modified: Thu, 30 Apr 2026 22:26:15 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

Cf-Cache-Status

Other

DYNAMIC

Cf-Ray

Other

9f911f23f9be2898-IAD

Date

Other

Sat, 09 May 2026 13:41:25 GMT

Via

Other

1.1 varnish

X-Cache

Other

HIT

X-Cache-Hits

Other

1

X-Fastly-Request-Id

Other

b1a8fcebfd449b5cfe4583f1f3923ec29fd80d0d

X-Github-Request-Id

Other

9D36:27FB35:97B4BD2:A1D93D5:69F3D7D0

X-Proxy-Cache

Other

MISS

X-Served-By

Other

cache-iad-kiad7000056-IAD

X-Timer

Other

S1778334086.770131,VS0,VE1

cf-cache-status: DYNAMIC
cf-ray: 9f911f23f9be2898-IAD
date: Sat, 09 May 2026 13:41:25 GMT
via: 1.1 varnish
x-cache: HIT
x-cache-hits: 1
x-fastly-request-id: b1a8fcebfd449b5cfe4583f1f3923ec29fd80d0d
x-github-request-id: 9D36:27FB35:97B4BD2:A1D93D5:69F3D7D0
x-proxy-cache: MISS
x-served-by: cache-iad-kiad7000056-IAD
x-timer: S1778334086.770131,VS0,VE1

Recommendations

Enable compression (gzip/brotli) to improve performance