@@ -129,7 +129,7 @@ customMiddlewareWithDetails cb getdate formatter app req sendResponse = do
129129 t1 <- getCurrentTime
130130 date <- liftIO getdate
131131 -- We use Nothing for the response size since we generally don't know it
132− builderIO <- newIORef ""
132+ builderIO <- newIORef $ B.fromByteString ""
133133 res' <- recordChunks builderIO res
134134 rspRcv <- sendResponse res'
135135 _ <- liftIO . cb .