Antoine Latter wrote:
None of the "lbs" functions in http-enumerator can operate in constant space - they are all built on top of the utility function "lbsIter" which provides a warning:
Convert the HTTP response into a Response value.
Even though a Response contains a lazy bytestring, this function does not utilize lazy I/O, and therefore the entire response body will live in memory. If you want constant > memory usage, you'll need to write your own iteratee and use http or httpRedirect directly.
Thanks Antoine. I know I read the documention a number of times but still managed to fall into that trap. I think it was because I tired using httpDirect, couldn't figure it out and then fell back to using the non-lazy lbs version. Basically I need a serveRequest function with a signature: import qualified Network.HTTP.Enumerator as HE import qualified Network.Wai as Wai serveRequest :: (MonadControlIO m, Failure HE.HttpException m) => HE.Request m -> m Wai.Response that calls httpRedirect to do a lazy download of the specified data and returns it as a Wai.Response using the ResponseEnumerator constructor. Unfortunately, I've tried a bunch if stuff and nothing I've come up with even comes close t type checking. Has anyone done anything like this and care to shed some light? Cheers, Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/