isaac: The Ring spec predates the recent popularity of namespaced keywords.

It’s something I’m planning to put forward for Ring 2.0, though the namespaces will be :ring.request/* and :ring.response/*.

👍 that would be better

I think also, ring should use deferred to support asynchronize, instead of arity of handler

deferred from Manifold?

Manifold is a significant size - it’s larger than Ring itself.

And others might want to use different async systems.

Ring uses the lowest-common-denominator. The simplest async solution that can be translated into any other async system.

If you want to use deferreds instead of the three-arity syntax, then it’s just three lines of middleware away.

actually, I like more async, I use promise-chan support asynchronization in my app internally. 🙂

Adding promise-chan support is also just a middleware away 🙂