fpco/http-reverse-proxy

Reverse proxy HTTP requests, either over raw sockets or with WAI

http-reverse-proxy

Provides a simple means of reverse-proxying HTTP requests. The raw approach uses the same technique as leveraged by keter, whereas the WAI approach performs full request/response parsing via WAI and http-conduit.

Raw example

The following sets up raw reverse proxying from local port 3000 to www.example.com, port 80.

{-# LANGUAGE OverloadedStrings #-}
import Network.HTTP.ReverseProxy
import Data.Conduit.Network

main :: IO ()
main = runTCPServer (serverSettings 3000 "*") $ \appData ->
    rawProxyTo
        (\_headers -> return $ Right $ ProxyDest "www.example.com" 80)
        appData

HTTPS example to proxy bing.com

The following example sets up reverse proxying froming to www.bing.com from localhost port 3000:

import Network.HTTP.Client.TLS
import Network.HTTP.ReverseProxy
import Network.Wai
import Network.Wai.Handler.Warp (run)

main :: IO ()
main = bingExample >>= run 3000

bingExample :: IO Application
bingExample = do
  manager <- newTlsManager
  pure $
    waiProxyToSettings
      ( \request ->
          return $
            WPRModifiedRequestSecure
              ( request
                  { requestHeaders = [("Host", "www.bing.com")]
                  }
              )
              (ProxyDest "www.bing.com" 443)
      )
      defaultWaiProxySettings {wpsLogRequest = print}
      manager

After running it, you can visit http://localhost:3000 to visit the search engine's page.