When running this Haskell program using runghc:
import Network.HTTP
main = simpleHTTP (getRequest "https://stackoverflow.com")
>>= getResponseBody >>= putStrLn
I get the error message
printso.hs: user error (https not supported)
I don't want to switch to unencrypted HTTP -- how can I use Network.HTTP with SSL/TLS?
You can't do that directly, see for example this post. However you could use Network.HTTP.Conduit from the http-conduit library instead.
First install it using cabal install http-conduit.
Then you can use this code (note that it contrast to Network.HTTP it uses lazy ByteStrings) as a replacement:
import Network.HTTP.Conduit
import qualified Data.ByteString.Lazy as LB
main = simpleHttp "https://stackoverflow.com"
>>= LB.putStr
Another alternative is to use the Haskell libcurl binding which depends on the native libcurl, however.
sink to get an IO Text or something like that, and then use standard filters for String or Text, see e.g. this tutorial: schoolofhaskell.com/school/to-infinity-and-beyond/…