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+{-# LANGUAGE OverloadedStrings #-}
+module Main where
+
+import Data.List
+import Text.Printf
+import Network.Wai
+import Network.HTTP.Types
+import Network.Wai.Handler.Warp (run)
+
+app :: Application
+app request respond = respond $
+ case rawPathInfo request of
+ "/" -> index
+ _ -> errorResponse
+
+index :: Response
+index =
+ responseLBS status200
+ [("Content-Type", "text/plain")]
+ "Hello, world!"
+
+errorResponse :: Response
+errorResponse =
+ responseFile status200
+ [("Content-Type", "text/plain")]
+ "pages/error.html"
+ Nothing
+
+main :: IO ()
+main = do
+ putStrLn $ "http://localhost:8080/"
+ run 8080 app