Comment by nabla9

Not any different from TLS.1.2 over TCP.

https://en.wikipedia.org/wiki/File:HTTP-1.1_vs._HTTP-2_vs._H...

Here is good intro for you:

The Security Challenges of HTTP/3 and QUIC — What You Need to Know https://medium.com/@RocketMeUpCybersecurity/the-security-cha...