I'm running into a problem handling requests with streaming request bodies that fail - using http-client, the failure takes a long time (potentially never) to propagate. Simple code (runnable project here https://github.com/mfine/streamy): {-# LANGUAGE OverloadedStrings #-} import Control.Monad import Data.Conduit.Combinators import Network.HTTP.Conduit import System.Environment a :: IO () a = do manager <- newManager tlsManagerSettings request <- parseUrl "http://httpbin.org/status/409" void $ httpLbs request manager b :: IO () b = do manager <- newManager tlsManagerSettings request <- parseUrl "http://httpbin.org/status/409" void $ flip httpLbs manager request { requestBody = requestBodySourceChunked $ repeatM $ return "a" } Running "a" above works as expected (propagating the error immediately). Running "b" has variable results, mostly never propagating the error. Looking at the wire, I can see that the 409 status comes back, but the exception does not propagate. Is there something I can do here to get quicker failure? Thanks! Mark