title: REST API, WebSocket and ZeroMQ in Scala. What to use?
body: <p>Let's say I have some service that talks over ZeroMQ sockets, and I want to provide access to that service to a single-page web application. I'd like the web app to talk to a service that provides a REST API (for control and queries) and WebSockets (for monitoring), and which does this by talking ZeroMQ to the first service. I'd like to write this in Scala.</p>
  
  <p>What options are available to me for building that second service?</p>