I’m just using ring (jetty) as the web server. But when I change :async? to true:
(jetty/run-jetty app {:port port :join? false :async? true})
Then none of my sync routes work. I don’t even know if it’s possible to have both sync and async handlers on the same jetty server (so I might be asking for the impossible here 
).
EDIT: I’m using compojure for routing