We're not currently using Async in our project, though we are looking to switch some code that was previously using Faraday with the :typhoeus adapter to instead use the :async_http adapter.

One feature we were relying on was the ability to run a batch of requests in parallel without raising exceptions if one of the requests hits a timeout. Say 20 requests are run in parallel and one of them times out, we still want the 19 successful responses (and we can retry the one timeout separately).

When I simulate this situation with the :async_http adapter, what I'm seeing is that the Async::TimeoutError is handled, then re-raised as Faraday::TimeoutError, even when running in parallel mode. This means that the whole in_parallel block raises an exception and therefore the other responses cannot be reached.

What typhoeus does instead is it puts two values into the response env:

• env[:typhoeus_connection_failed] (can be understood as Faraday::ConnectionFailed with the details found in env[:typhoeus_return_message])
• env[:typhoeus_timed_out] (can be understood as Faraday::TimeoutError)

Is there any way to keep the same capability of firing off 20 requests and letting some of them timeout or hit connection issues without failing all the others?