https://cloudflare-quic.com/ 443
Does my browser support HTTP/3 & QUIC?
When loading this page from Cloudflare's edge network, your browser used HTTP/3. This page is HTTP/3 & QUIC enabled. Try reloading a few times to spring it into action. ---- When loading this page from Cloudflare's edge network, your browser used HTTP/2.
Firefox, chrome OK -- ToshinoriMaeno 2023-11-18 22:25:27
https://domsignal.com/http3-test
https://geekflare.com/http3-test/
1. whois
How to Test if a Website Supports HTTP/3? By Chandan Kumar
2. history
n-1.space. 300 IN HTTPS 1 . alpn="h3,h2" ipv4hint=157.7.113.173