Rails on AWS: Do you need nginx between Puma and ALB? – Keita's Blog
Ruby on Rails + Puma + Nginx: Proxy Reverso com Unix Socket | SharkLabs
Docker + Rails + Puma + Nginx + Postgres | by Satendra Rai | ITNEXT
Dummy Puma server Sinatra Docker app. running on a socket - just plug your NginX. Good for debugging NginX config without connecting larger Puma app : r/nginx