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Is there a way to cap the concurrency with coroutines? when I run a lot of `async { ... http request ... }` at some point I am hitting connection refused, because the other end can not keep up.

If you are using `suspend`-based http-client (Ktor or any adapter around existing async clients), then there is no built-in solution and limiting threads count won’t help.
<https://github.com/Kotlin/kotlinx.coroutines/issues/460> may help, feel free to vote for it.

As ad-hoc solution you can use suspend-based Semaphore (it was posted in a thread above)

Also, actors around worker pool (<https://github.com/Kotlin/kotlinx.coroutines/issues/172>) can help, but it’s also yet to be implemented :disappointed: