Could you describe more about the docker sandbox that you have? I am especially interested in the network restrictions.
The container has restricted outbound access—only HTTP/S requests are allowed. It runs inside an isolated network namespace with no access to the host network or other infrastructure components. There's no inbound access, and the container can't receive unsolicited requests from the outside world.
The sandbox container can only communicate with other containers in the same network, the main application container and sandbox container are on the same network, allowing them to communicate.
Non-logged in curls are auto purged after 30 days.