indexo.dev

securityhandbook.io

.io crawl

First seen 2026-04-14 · Last seen 2026-05-05 · ok HTTP/1.1 200 1044 ms crawled 2026-05-07

US · 188.114.97.3 · AS13335 Cloudflare, Inc.

Reputation 95/100 weak security headers

Classifying

HTML metadata

Title
The Security Engineer Handbook
Description
A short, edgy, bold mini-guide to being a security engineer. Written by FAANG security engineers.
Language
en

Technology

CDN
Cloudflare

Third-party hosts loaded (1)

  • js.stripe.com×1

DNS records live

NS
  • lara.ns.cloudflare.com
  • lee.ns.cloudflare.com

Email authentication no MX

SPF
not published
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

WE1
from 2026-04-21 to 2026-07-20
Expires in 62 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 45/100 Checked live page: https://securityhandbook.io/

present
  • x-content-type-options
  • referrer-policy
findings
  • missing HSTS
  • missing Content Security Policy
  • missing frame protection
  • missing Permissions Policy
Header values
referrer-policy
strict-origin-when-cross-origin
x-content-type-options
nosniff

Linked from (1)