Could not find module `Network.HTTP' on simple http get example

Question

I'm trying this simple example:

module Main where
import Network.HTTP

import Lib

get :: String -> IO String
get url = simpleHTTP (getRequest url) >>= getResponseBody

-- 2. Get the response code
getCode :: String -> IO ResponseCode
getCode url = simpleHTTP req >>= getResponseCode
    where req = getRequest url

main :: IO ()
main = do 
    x <- get "http://google.com"
    putStrLn x

I get

/workspaces/hask_exercises/api-exercises/app/Main.hs:2:1: error:
    Could not find module `Network.HTTP'
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
  |
2 | import Network.HTTP
  | ^^^^^^^^^^^^^^^^^^^

I tried from here: Haskell: Could not find module ‘Network.HTTP’

cabal install --lib network
cabal: The program 'ghc' version >=7.0.1 is required but it could not be
found.


 ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.10.4

how did you install Haskell (GHC/Cabal)? How did you setup / compile your program? — Random Dev
– Random Dev, Commented May 26, 2021 at 4:10
@Carsten sh -c "curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh" and stack run — Poperton
– Poperton, Commented May 26, 2021 at 14:24
My guess is that GHC is not in you path (cabal does not find it) - you write you used stack - maybe you did stack setup? If it'll not install GHC in your path - and in this case you should use stack to install your dependencies too — Random Dev
– Random Dev, Commented May 26, 2021 at 14:49

aleksxor · Accepted Answer · 2021-05-28 12:03:29Z

4

+50

As you're using stack project you should first add dependency in dependencies section in your package.yaml like that:

dependencies:
- base >= 4.7 && < 5
- HTTP

and then run stack build.

answered May 28, 2021 at 12:03

aleksxor

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