request_page.ex

defp request_page(url) do
    case HTTPoison.get(url) do
      {:error, res} ->
        {:error, res.reason}
      {:ok, res} ->
        case res do
          %HTTPoison.Response{status_code: 404} -> {:error, 404}
          %HTTPoison.Response{status_code: 401} -> {:error, 401}
          %HTTPoison.Response{status_code: 403} -> {:error, 403}
          %HTTPoison.Response{status_code: 200, body: body} -> {:ok, body}
        end
    end
  end