title: How to run WebSockets with multiple server instances?
body: <p>It is useful to run multiple instances of HTTP servers for scaling.</p>
  
  <p>However, it seems that this would not work with WebSockets because each server instance would have its own set of connections to clients.</p>
  
  <p>How can you run WebSockets on multiple server instances if they all need to share a common set of connections?</p>