version: '3.8'

services:
  proxy:
    image: ubuntu/squid:latest  # Lightweight and configurable proxy server
    container_name: proxy
    networks:
      - internal
      - external
    restart: unless-stopped

  # This example doesn't work as-is, unless if you docker compose up proxy *first*,
  # and wait for it to finish initialization.
  app:
    image: curlimages/curl:latest  # Using a simple curl container for testing purposes
    container_name: app
    networks:
      - internal
    depends_on:
      - proxy
    environment:
      - http_proxy=http://proxy:3128
      - https_proxy=http://proxy:3128
    command: ["curl", "https://example.com"]  # Replace this with the actual app's start command


networks:
  internal:
    internal: true
  external: