docker-compose.yml

version: "3"

services:
  nginx:
    image: nginx:1.19-alpine
    container_name: nginx
    restart: always
    ports:
      - 80:80
      - 443:443
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro

  backend:
    image: private-docker-registry.com
    container_name: backend
    restart: always

nginx.conf

erver {
  listen 443 ssl;
  server_name domain.com;

  include "/etc/nginx/conf.d/inc/ssl.conf";

  location /api {
    proxy_pass http://backend;

    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $http_connection;
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
  }
}