graph TD;
Testenv-->Proxy;
Proxy-->Internet;
Directory structure
.
├── docker-compose.yml
├── squid.conf : configurateion file for squid.
└── whitelist : whitelist URL. See also : https://wiki.squid-cache.org/SquidFaq/SquidAcl#im-trying-to-deny-foocom-but-its-not-working
$ docker compose up -d
$ docker compose run -it --rm testenv /bin/bash
$ docker compose logs proxy -f