I downloaded the code from the PragProg site and matched it up. I believe this is the right fragment of code that should be there (it’s on pages 142-3 from the last edition I downloaded from the site ~Aug 2022).
(mount/defstate app-routes
:start
(ring/ring-handler
(ring/router
[(home-routes)
(service-routes)
(websocket-routes)])
;;...