System.IO.Streams.HTTP

Here is an example GET request that streams the response body to standard output:

import           System.IO.Streams (InputStream, OutputStream)
import qualified System.IO.Streams as Streams
import           System.IO.Streams.HTTP
import           Network.HTTP.Client

main :: IO ()
main = do
  req <- parseUrl "http://google.com"
  withManager defaultManagerSettings $ \m -> 
    withHTTP req m $ \resp -> do
      Streams.handleToOutputStream stdout >>=
        Streams.connect (responseBody resp)

Here is an example POST request that also streams the request body from standard input:

{-# LANGUAGE OverloadedStrings #-}

module Main where
import           System.IO.Streams       ( InputStream, OutputStream )
import qualified System.IO.Streams as    Streams
import           System.IO.Streams.HTTP  ( withHTTP, parseUrl, withManager )
import           Network.HTTP.Client.TLS ( tlsManagerSettings )
import           Network.HTTP.Client     ( responseBody )

main :: IO ()
main = do
 req <- parseUrl "http://www.worldslongestwebsite.com"
 withManager tlsManagerSettings $ \m ->
   withHTTP req m $ \resp -> do
     Streams.supplyTo Streams.stdout (responseBody resp)

For non-streaming request bodies, study the RequestBody type, which also accepts strict / lazy bytestrings

http-client

This module is a thin io-streams wrapper around the http-client and http-client-tls libraries.

Read the documentation in the Network.HTTP.Client module of the http-client library to learn about how to:

• manage connections using connection pooling,
  • use more advanced request/response features,
  • handle exceptions, and:
  • manage cookies.

  http-client-tls provides support for TLS connections (i.e. HTTPS).

module Network.HTTP.Client

module Network.HTTP.Client.TLS

io-streams Interface

withHTTP :: Request -> Manager -> (Response (InputStream ByteString) -> IO a) -> IO a

Send an HTTP Request and wait for an HTTP Response

streamN :: Int64 -> InputStream ByteString -> RequestBody

Stream with N bytes exactly

stream :: InputStream ByteString -> RequestBody

Stream body of request