I have found myself. It is example to extract all Request POST data and return it in Response


import qualified Data.ByteString.Char8 as C
import Network.Wai.Parse (parseRequestBody, lbsSink)

main = run 3000 app

app req = do
  (params, _) <- parseRequestBody lbsSink req
  let r = C.concat $ map (\(x,y) -> C.concat [x,y]) params
  return $ ResponseBuilder 
      status200
      [("Content-Type", "text/plain")]
      $ copyByteString r

2011/3/6 Антон Чешков <acheshkov@gmail.com>
Hi Michael. Please explain how to extract POST data from WAI Request.

Thanks.

--
Best regards,
Cheshkov Anton
Phone: +7 909 005 18 82
Skype: cheshkov_anton



--
Best regards,
Cheshkov Anton
Phone: +7 909 005 18 82
Skype: cheshkov_anton