Cloudflare identified several limitations in NGINX architecture and decided to write their own reverse proxy.

0:00 Intro
1:53 What NGINX is used for
3:37 NGINX Architecture
7:52 NGINX Limitations
17:12 Cloudflare Pingora

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Resources Resources:

https://blog.cloudflare.com/how-we-built-pingora-the-proxy-that-connects-cloudflare-to-the-internet/

https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/amp/