Pinterest moves to HTTP/3 on all their clients and edge CDNs this year. They witnessed interesting gains but not without good lesson learned. The main one was the mismatch of alt-svc vs DNS ttls.

I cover this on the next episode of the backend engineering course.

0:00 Intro

2:00 Moving h2 to h3 through alt-svc

5:00 Why HTTP/3

6:00 HTTP/1 vs HTTP/2

9:00 TCP Head of Line blocking in HTTP/2

11:00 How HTTP/3 addresses HOL

12:15 Connection Migration

13:30 Stream level congestion control

14:10 1-RTT - 0-RTT

15:41 Pinterest challenges moving HTTP/3

19:00 Migration

21:15 Future work

22:30 Summary

article https://medium.com/pinterest-engineering/pinterest-is-now-on-http-3-608fb5581094

Fundamentals of Backend Engineering Design patterns udemy course (link redirects to udemy with coupon) https://backend.husseinnasser.com