websockets returning nxdomain on start_link callup from slack rtm api

[jeshocarmel]

When connecting with the Slack RTM API with websocket_client as dep, I'm receiving a{:error, :nxdomain} error.

Initially I thought it was Slack which which didn't accept my proxy settings but later on debugging I found Slack sends me a 200 response and found that the websocket_client was the one who was not able to bypass my proxy settings.

I'm attaching my slack rtm api code here

  def start_link(token, initial_state, client \\ :websocket_client) do
        case Slack.Rtm.start(token) do
          {:ok, rtm} ->
            state = %{
              rtm: rtm,
              state: initial_state,
              client: client,
              token: token
            }
            url = String.to_char_list(rtm.url)
            client.start_link(url, __MODULE__, state)
          {:error, %HTTPoison.Error{reason: :connect_timeout}} ->
            {:error, "Timed out while connecting to the Slack RTM API"}
          {:error, %HTTPoison.Error{reason: :nxdomain}} ->
            {:error, "Could not connect to the Slack RTM API"}
          {:error, error} ->
            {:error, error}
        end
      end

FYI I'm new to Erlang. Kindly help @jeremyong

[splashx]

@jeshocarmel Did you solve this at the end? It looks like a proxy support in this websockets_client is required. We're hitting the same problem @ Elixir-Slack simply because websockets are not going through the proxy #bummer