Http package:pipes-http

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

import Pipes
import Pipes.HTTP
import qualified Pipes.ByteString as PB  -- from `pipes-bytestring`

main = do
req <- parseUrlThrow "https://www.example.com"

manager <- withManager tlsManagerSettings

withHTTP req manager $ \resp ->
runEffect $ responseBody resp >-> PB.stdout

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

{-# LANGUAGE OverloadedStrings #-}

import Pipes
import Pipes.HTTP
import qualified Pipes.ByteString as PB

main = do
req <- parseUrlThrow "https://www.example.com"

let req' = req
{ method = "POST"
, requestBody = stream PB.stdin
}

manager <- newManager tlsManagerSettings

withHTTP req' manager $ \resp ->
runEffect $ responseBody resp >-> PB.stdout

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

HTTP client with pipes interface pipes-http is a pipes wrapper around the http-client library

Send an HTTP Request and wait for an HTTP Response