haskell wreq: disable certificate validation

disable-certifcate-validation.cabal

name:                disable-certifcate-validation
version:             0.1.0.0
synopsis:            Simple project template from stack
description:         Please see README.md
homepage:            http://github.com/j-keck/disable-certifcate-validation#readme
license:             BSD3
license-file:        LICENSE
author:              j-keck
maintainer:          jhyphenkeck@gmail.com
copyright:           2010 Author Here
category:            Web
build-type:          Simple
cabal-version:       >=1.10

executable disable-certifcate-validation
  hs-source-dirs:      src
  main-is:             Main.hs
  default-language:    Haskell2010
  build-depends:       base >= 4.7 && < 5
                     , bytestring
                     , connection
                     , http-client-tls
                     , lens
                     , wreq

Main.hs

{-# LANGUAGE OverloadedStrings #-}
module Main where

import           Control.Exception       (SomeException, try)
import           Control.Lens
import qualified Data.ByteString.Lazy    as BL
import           Network.Connection      (TLSSettings (..))
import           Network.HTTP.Client.TLS (mkManagerSettings)
import           Network.Wreq

urlWithInvalidCert = "https://cacert.org"


main :: IO ()
main = do
  res1 <- try (get urlWithInvalidCert) :: IO (Either SomeException (Response BL.ByteString))
  -- Left (TlsExceptionHostPort (HandshakeFailed (Error_Protocol ("certificate rejected: [SelfSigned]",True,CertificateUnknown))) "cacert.org" 443)
  print res1
  res2 <- try (get' urlWithInvalidCert) :: IO (Either SomeException (Response BL.ByteString))
  -- Right (Status {statusCode = 200, statusMessage = "OK"})
  print $ fmap (^. responseStatus) res2

get' url = let opts = defaults & manager .~ Left (mkManagerSettings (TLSSettingsSimple True False False) Nothing)
           in getWith opts url