Could not open connection to host on OTP 26

[ndan]

ldclient couldn't connect on OTP 26

To reproduce
Create a new project with mix new hello_world --sup

.tool-versions

elixir 1.15.4-otp-26
erlang 26.0.2

mix.exs

  defp deps do
    [
      {:ldclient, "~> 2.0", hex: :launchdarkly_server_sdk},
      {:eredis, "1.7.1", override: true}
    ]
  end

applications.ex

  @impl true
  def start(_type, _args) do
    children = [
      # Starts a worker by calling: HelloWorld.Worker.start_link(arg)
      # {HelloWorld.Worker, arg}
    ]


    :ldclient.start_instance(~c"sdk-******")  # <--- Add this line

    # See https://hexdocs.pm/elixir/Supervisor.html
    # for other strategies and supported options
    opts = [strategy: :one_for_one, name: HelloWorld.Supervisor]
    Supervisor.start_link(children, opts)
  end

iex -S mix

10:48:35.279 [error] GenServer #PID<0.449.0> terminating
** (TryClauseError) no try clause matching: {:error, :gun_open_failed, ~c"Could not open connection to host"}
    (ldclient 2.1.1) /Users/dev/hello_world/deps/ldclient/src/ldclient_update_stream_server.erl:129: :ldclient_update_stream_server.do_listen/1
    (ldclient 2.1.1) /Users/dev/hello_world/deps/ldclient/src/ldclient_update_stream_server.erl:89: :ldclient_update_stream_server.handle_info/2
    (stdlib 5.0.2) gen_server.erl:1077: :gen_server.try_handle_info/3
    (stdlib 5.0.2) gen_server.erl:1165: :gen_server.handle_msg/6
    (stdlib 5.0.2) proc_lib.erl:241: :proc_lib.init_p_do_apply/3
Last message: {:listen}
State: %{headers: %{"authorization" => "sdk-*********", "user-agent" => "ErlangClient/2.1.1"}, stream_uri: ~c"https://stream.launchdarkly.com/all", feature_store: :ldclient_storage_ets, backoff: %{max: 30000, value: :listen, initial: 1000, destination: #PID<0.449.0>, current: 1000, active_since: :undefined, attempt: 0}, conn: :undefined, gun_options: %{protocols: [:http], retry: 0, connect_timeout: 2000}, storage_tag: :default}

Revert to OTP 25 to confirm the problem caused by v26
.tool-versions

elixir 1.15.4-otp-25
erlang 25.3.2.5

mix deps.compile
iex -S mix

:ldclient.variation("my-flag", :ldclient_context.new("123"), false) # => true

SDK version
2.1.1

OS/platform
MacOS 13.4.1 (M2)

[kinyoklion]

Hello @ndan,

I need to do some investigation, but it does work if you include http_options.

For erlang that would be a snippet like this in the options.

        http_options => #{
            tls_options => ldclient_config:tls_basic_options()
        }

It appears that new defaults will be needed for OTP 26.

Filed internally as 214652

Thank you,
Ryan

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