emptygif
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WAI + Warp Haskell

A Haskell snippet for WAI + Warp that answers requests for /pixel.gif with the empty GIF, decoded once at startup.

WAI + Warp Haskell

Install
build-depends: base, bytestring, base64-bytestring, http-types, wai, warp
File
Main.hs
Run
cabal run
{-# LANGUAGE OverloadedStrings #-}

import qualified Data.ByteString.Base64 as Base64
import qualified Data.ByteString.Lazy as BL
import Network.HTTP.Types (methodGet, status200, status404)
import Network.Wai
import Network.Wai.Handler.Warp (run)

gif :: BL.ByteString
gif = BL.fromStrict (Base64.decodeLenient "R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==")

app :: Application
app req respond
  | requestMethod req == methodGet && rawPathInfo req == "/pixel.gif" =
      respond $ responseLBS status200
        [("Content-Type", "image/gif"), ("Cache-Control", "no-store")] gif
  | otherwise = respond $ responseLBS status404 [] "Not Found"

main :: IO ()
main = run 8080 app

Checked against the framework's current documentation.

Check it

curl -sI http://localhost:8080/pixel.gif

Official site: WAI + Warp

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