Reproduce issue gargantext/haskell-gargantext#456

README.md

@@ -38,3 +38,14 @@ main = do
 https://api.istex.fr/document/?output=author,title,abstract,publicationDate,refBibs&scroll=1m&q=coffee
 
 FatalError {fatalErrorMessage = "ConnectionError (HttpExceptionRequest Request {\n  host                 = \"api.istex.fr\"\n  port                 = 443\n  secure               = True\n  requestHeaders       = [(\"Accept\",\"application/json;charset=utf-8,application/json\")]\n  path                 = \"document\"\n  queryString          = \"?output=author,title,abstract,publicationDate,refBibs&scroll=1m&q=coffee\"\n  method               = \"GET\"\n  proxy                = Nothing\n  rawBody              = False\n  redirectCount        = 10\n  responseTimeout      = ResponseTimeoutDefault\n  requestVersion       = HTTP/1.1\n}\n ConnectionTimeout)"}
+
+## Nix
+
+You can easily compile the whole project with nix flakes:
+```shell
+nix run
+```
+or if you want a development shell:
+```shell
+nix -L develop
+```

app/Main.hs

@@ -7,7 +7,7 @@ main :: IO ()
 main = do
   res <- getMetadataWith "artificial intelligence" (Just 10)
   case res of
-    (Left err) -> print "Error"
+    (Left err) -> print $ "Error: " <> show err
     (Right val) -> do
       print $ take 5 $ _documents_hits val
        -- print $ _abstract <$> (_hits val)

package.yaml

-name:                crawlerISTEX
-version:             0.1.0.0
-github:              "garganscript/crawlerISTEX"
-license:             AGPL
-author:              "GarganText"
-maintainer:          "support@gargantext.org"
-copyright:           "CNRS"
-
-extra-source-files:
-- README.md
-- ChangeLog.md
-
-# Metadata used when publishing your package
-# synopsis:            Short description of your package
-# category:            Web
-
-# To avoid duplicated efforts in documentation and dealing with the
-# complications of embedding Haddock markup inside cabal files, it is
-# common to point users to the README.md file.
-description:         Please see the README on GitHub at <https://github.com/Mudada/crawlerISTEX#readme>
-
-dependencies:
-- aeson
-- base >= 4.7 && < 5
-- ghc  # Panic
-- text
-- lens
-- servant
-- servant-client
-- http-client
-- http-client-tls
-
-default-extensions:
-  - DataKinds
-  - DeriveGeneric
-  - NamedFieldPuns
-  - OverloadedStrings
-  - RecordWildCards
-  - TypeOperators
-
-library:
-  source-dirs: src
-
-executables:
-  crawlerISTEX-exe:
-    main:                Main.hs
-    source-dirs:         app
-    ghc-options:
-    - -threaded
-    - -rtsopts
-    - -with-rtsopts=-N
-    dependencies:
-    - crawlerISTEX
-
-tests:
-  crawlerISTEX-test:
-    main:                Spec.hs
-    source-dirs:         test
-    ghc-options:
-    - -threaded
-    - -rtsopts
-    - -with-rtsopts=-N
-    dependencies:
-    - crawlerISTEX