Exemple de script qui fait du streaming direct vers le disque (#3452)

* Start initial prototype

* Implement example of streaming

* Format

scripts/req_stream.exs

@@ -0,0 +1,22 @@
+Mix.install([
+  {:req, "~> 0.4.0"}
+])
+
+large_file_url = "https://www.data.gouv.fr/fr/datasets/r/c83ba91e-2cd1-40f7-a632-eb0a76d83c49"
+# small_file_url = "https://httpbin.org/range/100000"
+
+url = large_file_url
+# url = small_file_url
+
+# Download file to disk via an IO.Stream
+file = File.stream!("test.data", [:write])
+
+try do
+  # NOTE: decode_body is apparently disabled on response streaming
+  # https://hexdocs.pm/req/Req.Steps.html#decode_body/1
+  response = Req.get!(url, into: file)
+  # :body is just a ref to the File.Stream
+  IO.inspect(response, IEx.inspect_opts())
+after
+  :ok = File.close(file)
+end