Force close all connections in a node.js http server

You need to

1. subscribe to the connection event of the server and add opened sockets to an array
2. keep track of the open sockets by subscribing to their close event and removing the closed ones from your array
3. call destroy on all of the remaining open sockets when you need to terminate the server

You also have the chance to run the server in a child process and exit that process when you need.