testdriven.io

.io crawl

First seen 2026-04-11 · Last seen 2026-05-18 · ok HTTP/1.1 200 941 ms crawled 2026-05-18

US · 172.67.162.74 · AS13335 Cloudflare, Inc.

Reputation 100/100

Classifying

HTML metadata

Title: Test-Driven Development, Microservices, Web Development Courses | TestDriven.io
Description: Learn how to build, test, and deploy microservices with our web development tutorials powered by Docker, Flask, React, Django, and Angular. View the courses here.
Language: en

Open Graph

url: https://testdriven.io/
title: Test-Driven Development, Microservices, Web Development Courses from TestDriven.io
description: Learn how to build, test, and deploy microservices with our web development tutorials powered by Docker, Flask, React, Django, and Angular. View the courses here.

Technology

CDN: Cloudflare
CMS: Gatsby

Analytics

Google Tag Manager

Fonts

Font Awesome

Social widgets

Twitter Widget

Third-party hosts loaded (8)

www.googletagmanager.com×2
cdn.jsdelivr.net×1
cdnjs.cloudflare.com×1
code.jquery.com×1
platform.twitter.com×1
stackpath.bootstrapcdn.com×1
use.fontawesome.com×1
www.facebook.com×1

Social

DNS records live

NS

sam.ns.cloudflare.com
sara.ns.cloudflare.com

MX

1 mx1.mailchannels.net
5 mx2.mailchannels.net

TXT

ahrefs-site-verification_f8de7641a54787cc670a793ec1c7f9f8989fd8155963dd6e1b4573056555d0a5

Email authentication strong

SPF

v=spf1 include:sendgrid.net include:servers.mcsv.net include:netblocks.dreamhost.com -all

strict (-all)

DMARC

v=DMARC1; p=reject; sp=none; pct=100; ri=86400; rua=mailto:michael@testdriven.io

policy: reject (enforced) · sp=none

DKIM

k2: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv2aC2KjGKLOwTweBY5A9RpjsxaBXR9r7OAU6U8/zn92ivImI75naUujWbItRI/QmL1jy5PWGqLwoUA…
s1: k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6jgkClyxoXIhxBMs7gVuMOcqfj3g4lO6IB7zwrWHGszEZwxCzA/uGniAgePN8+iEBHrHeXDbfWwbR5woxH…
s2: k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3CrHU/27MEHpsSnEX1u2ybG/fyGVXEQjyY+1vO2wFizP7s2MKk458sX9AwiWQEOv9m3tBpuki1fgPBeKLX6lQGk…

selectors probed

Certificate (current)

WE1

from 2026-05-06 to 2026-08-04

Expires in 77 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 70/100 Checked live page: https://testdriven.io/

present

strict-transport-security
x-frame-options
x-content-type-options
referrer-policy
cross-origin-opener-policy

findings

short HSTS max-age
missing Content Security Policy
missing Permissions Policy

Header values

referrer-policy: same-origin
x-frame-options: DENY
x-content-type-options: nosniff
strict-transport-security: max-age=3600; includeSubDomains; preload
cross-origin-opener-policy: same-origin