anchor.diff:  
   [source,scala]
   -------------------------------------------------------------------------------
  -serverRouter = ServerRouter(
  +router = Router(
     static = ...,
     dynamic = ...,
     rootPath = "/ui/"
  
positive.code:       'div(text)
      )
    },
    serverRouter = ServerRouter(
      // Static router works when user enters
      // with any url but "/".
      static = (deviceId) => Router(
  
negative.code: ------------------------------
  val config = KorolevServiceConfig[Future, Boolean, Any](
    stateStorage = StateStorage.default(false),
    router = Router.empty[Future, Boolean],
    render = { case _ => 'div("Hello akka-http") }
  )
  
  