Security

Cloudflare secure check https://radar.cloudflare.com/
DNSSEC check tool https://dnssec-debugger.verisignlabs.com/
DNSSEC toturial：https://moneyslow.com/html/metebalci.com/blog/a-minimum-complete-tutorial-of-dnssec/index.html
DNSSEC error code https://developers.cloudflare.com/1.1.1.1/infrastructure/extended-dns-error-codes/
DNS SERVFAIL why? https://repost.aws/zh-Hant/knowledge-center/route53-dns-servfail-response
Header（CSP ）check https://securityheaders.com/
How to WordPress header https://wordpress.org/support/topic/how-to-set-security-headers-correctly/
encryption security check Qualys
BGP security check https://isbgpsafeyet.com/
php security best practice https://www.cyberciti.biz/tips/php-security-best-practices-tutorial.html
php security check (by korean)：https://suhosin.org/IKEv2 https://surfshark.com/blog/ikev2-vpn
http3/quic check https://http3check.net/