Hi now, I runhaskell file-echo.lhs sample which in yesoddocs/yesod/tutorials, and check it on firefox and chromium browsers. On firefox, I confirm the program works good for varias type files. But, on chromium, i get error for same uploaded files which has no extensions like as README, TODO, LICENSE, ... when, I modify file-echo.lhs as below in order to get a log. --- postHomepage = do rr <- getRequest liftIO $ putStrLn "OK" -- Logging (_, files) <- liftIO $ requestBody rr fi <- maybe notFound return $ lookup "file" files liftIO $ do -- Logging putStrLn $ fileName fi putStrLn $ fileContentType fi return [(fileContentType fi, toContent $ fileContent fi)] --- On chromium, this handler function success to putStrLn "OK", but fail to putStrLn the others. I'd like to check HTTP headers, But i couldn't find my POST request in "Resources". The developer tool on chromium, my POST request is replaced by a request for 'chrome://chromewebdata/' Anyone knows this problem?