Re: [Haskell-beginners] Download a large file using Network.HTTP

And here's the guy who's http-conduit's maintainer =). The only thing I said that he didn't is that you may take the total size from the response headers, but you may do this over his code. Cheers, On Mon, Dec 10, 2012 at 11:46 AM, Michael Snoyman wrote:

Here's an example of printing the total number of bytes consumed using http-conduit:

import Control.Monad.IO.Class (liftIO) import qualified Data.ByteString as S import Data.Conduit import Data.Conduit.Binary as CB import Network.HTTP.Conduit

main :: IO () main = withManager $ \manager -> do req <- parseUrl "http://www.yesodweb.com/" res <- http req manager responseBody res $$+- printProgress =$ CB.sinkFile "yesodweb.html"

printProgress :: Conduit S.ByteString (ResourceT IO) S.ByteString printProgress = loop 0 where loop len = await >>= maybe (return ()) (\bs -> do let len' = len + S.length bs liftIO $ putStrLn $ "Bytes consumed: " ++ show len' yield bs loop len')

HTH, Michael

On Mon, Dec 10, 2012 at 3:34 PM, Cedric Fung wrote:

...

Hi,

Are there any suggestions to download a large file with Haskell? I have read the docs for Network, Network.HTTP and Network.HTTP.Conduit, but can't find anything which fit my requirements.

I want to download a large file from an HTTP URL, and show the progress instantly. Maybe some functions which read HTTP connection and return a lazy ByteString could do this work?

Though I found a low-level socket lazy package, which seems to work, I just want a more high level API.

Thanks and regards.

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-- Felipe.