title: Spawning child processes in an express server
body: <p>In my express server there are some functions which I need to run as child processes because otherwise they'll tie up the server and other people won't be able to access it. They're already using the async module but they still tie up the server unless they're run as child processes.</p>
  
  <p>One problem is passing the req and res parameters to them.</p>
  
  <p>How can this be done?</p>