Following up with the async and sync discussion. I still couldn't figure this out so maybe a good soul in the community would post something about it. I'm sure this isn't the first time this issue is bring to the light. I created a repository with the problem scenario: I'm back working in the issue and I created a repository with the scenario.. https://github.com/wcalderipe/lab-compojure-aleph-sync-and-async/blob/master/src/lab_compojure_aleph_async/core.clj

@wcalderipe you app should either be fully (sync) ring or async-ring (3 arity). In your example, line41, you define it as sync (1 arity). I don't think you can mix them in ring. Interceptor-model allows you to do it.

Thanks for taking a look on it 🙌 basically this is my original questions "can sync and async handlers coexist in ring?" and you might have answered it. Also, after you mentioned the interceptor model, I quickly found a good article about it, thanks! https://lispcast.com/a-model-of-interceptors/