Hi, On feature requests for Warp, I have only two outstanding requests: 1) A way of finding how long a response took to generate. 2) A way of finding out when exceptions happen. Can either of these be achieved with middleware, or Response transformers? I thought the timing one could probably be done by consuming all the Response output, and then as a final action at the end writing to an MVar or a Chan, which some other thread could read from to see the time elapsed. Is that possible? It seems feasible... I couldn't think of any way of displaying exceptions though, so perhaps allow runEx which takes an exception handler: runEx :: Port -> Application -> (Request -> SomeException -> IO ()) -> IO () Is there any other way to robustly get all exceptions? Regarding Jeremy's points about using Happstack, I originally considered Happs for use in Hoogle many years ago. Then I came to the conclusion that just installing Happs was too much pain (this was the days before cabal install), and I wouldn't get enough payoff. All the things you describe about setting cookies, transforming output etc. aren't things that Hoogle yet does, so I still think the payoff is still too small. If Hoogle gets more features, I'll evaluate once more. I certainly don't consider Happstack to be sewerage :-) Thanks, Neil