Background Julia TCP server

My use case

Create a Julia background process which I can call from another server. When I pass it some arguments, it does stuff, sends a response, then waits for the next request.

What I tried

If there's a more 'Julia' way of doing it, let me know, but I thought this would be a good use case for a TCP server like in the docs' example:

using Sockets

@async begin
       server = listen(2001)
       while true
           sock = accept(server)
           @async while isopen(sock)
               write(sock,readline(sock))
           end
       end
   end

...Which works fine in the REPL! but I want it to run in the background permanently so I don't need to keep a REPL open.

When I put the above in app.jl and run julia app.jl it obviously runs then quits instantly. What's the best way to keep it running, even after closing my terminal?

Edits

My client is an Elixir server.
I would prefer TCP over HTTP just for performance reasons, but I can be persuaded if it ends up being too much work.

Solution

I put several option in the comment. Now the simplest approach is to remove @async in front of the begin statement in your code and run (I assume Linux):

nohup julia app.jl &

Of course you can add 1> and 2> to redirect standard output and standard error, put it as a cron job etc.

JuliaWebAPI + ZeroMQ will be however more robust for production systems and Distributed will be more convenient for computational solutions.