HTTP Headers Analysis for https://newsletter.deepsource.io

Detected Technologies from Headers

See all in URL Inspect 1

Cloudflare CDN

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

Good

SAMEORIGIN

X-Content-Type-Options

Missing

Not configured

Referrer-Policy

Present

same-origin

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-Content-Type-Options: nosniff
• Consider adding Permissions-Policy to control browser features

Performance Headers

Connection

Performance

close

connection: close

Caching Headers

Cache-Control

Caching

private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0

Expires

Caching

Thu, 01 Jan 1970 00:00:01 GMT

cache-control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
expires: Thu, 01 Jan 1970 00:00:01 GMT

Content Headers

Content-Length

Content

16

Content-Type

Content

text/plain; charset=UTF-8

content-length: 16
content-type: text/plain; charset=UTF-8

Server Headers

Server

cloudflare

server: cloudflare

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Cf-Ray

Other

9ef5b7fdbc80ccb0-IAD

Date

Other

Mon, 20 Apr 2026 17:02:47 GMT

Server-Timing

Other

cfEdge;dur=26,cfOrigin;dur=0,cfWorker;dur=1

cf-ray: 9ef5b7fdbc80ccb0-IAD
date: Mon, 20 Apr 2026 17:02:47 GMT
server-timing: cfEdge;dur=26,cfOrigin;dur=0,cfWorker;dur=1

Recommendations

Enable compression (gzip/brotli) to improve performance