[Haskell-cafe] Browser action and new http library

[Bjorn Bringert]

On Nov 27, 2007, at 0:54 , bbrown wrote:

>
> I am trying to use the HTTP library 3001 for ghc 6.8 and cant  
> figure out how
> to use a proxy to do a GET request as I am behind a proxy server.   
> My thinking
> is that I could use the setProxy method it looks like it returns a
> BrowserAction?  What do I do with that.  Here is the current code  
> (I havent
> really used the setProxy yet).
>
> --
> -- HTTP LIBRARY version: HTTP-3001.0.2
>
> import Data.Char (intToDigit)
> import Network.HTTP
> import Network.URI
> import Network.Browser (defaultGETRequest)
> import System.Environment (getArgs)
> import System.Exit (exitFailure)
> import System.IO (hPutStrLn, stderr)
>
> main =
>     do
>     args <- getArgs
>     case args of
> 	[addr] -> case parseURI addr of
> 		       Nothing -> err "Could not parse URI"
> 		       Just uri -> do
> 				   cont <- get uri
> 			           putStr cont
> 	_ -> err "Usage: lman <url>"
>
> err :: String -> IO a
> err msg = do
> 	  hPutStrLn stderr msg
> 	  exitFailure
>
> get :: URI -> IO String
> get uri =
>     do
>     eresp <- simpleHTTP (defaultGETRequest uri)
>     resp <- handleErr (err . show) eresp
>     case rspCode resp of
>                       (2,0,0) -> return (rspBody resp)
>                       _ -> err (httpError resp)
>     where
>       showRspCode (a,b,c) = map intToDigit [a,b,c]
>       httpError resp = showRspCode (rspCode resp) ++ " " ++  
> rspReason resp
>
> --
> -- Handle Connection Errors
> handleErr :: Monad m => (ConnError -> m a) -> Either ConnError a ->  
> m a
> handleErr h (Left e) = h e
> handleErr _ (Right v) = return v
>
> -- End of File

There aren't any examples of setProxy usage in the repo, but there  
was a discussion about it here a few days ago. See http:// 
www.nabble.com/HTTP-actions---proxy-server-t4815272.html

/Björn