Issue starting async task from within cowboy_websocket websocket_handle

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1

The code that is causing issues for me is this:

  def websocket_handle({:binary, message}, state) do
    supervisor = {Outcall.TaskSupervisor, :"outcall@127.0.0.1"}
    Task.Supervisor.async(supervisor, Kernel, :node, []) |> Task.await()
    {:reply, {:binary, message}, state}
  end

The error is this:

15:56:14.234 [error] Ranch listener Communicate.Router.HTTP had connection process started with :cowboy_clear:start_link/4 at #PID<0.393.0> exit with reason: {:badarg, [{:erlang, :iolist_size, [{:EXIT, #PID<18452.208.0>, :normal}], []}, {:cow_ws, :payload_length, 1, [file: 'experiment/gateway/elixir/deps/cowlib/src/cow_ws.erl', line: 725]}, {:cow_ws, :frame, 2, [file: '/experiment/gateway/elixir/deps/cowlib/src/cow_ws.erl', line: 666]}, {:cowboy_websocket, :websocket_send, 2, [file: 'experiment/gateway/elixir/deps/cowboy/src/cowboy_websocket.erl', line: 626]}, {:cowboy_websocket, :handler_call, 6, [file: '/experiment/gateway/elixir/deps/cowboy/src/cowboy_websocket.erl', line: 542]}, {:cowboy_http, :loop, 1, [file: '/experiment/gateway/elixir/deps/cowboy/src/cowboy_http.erl', line: 254]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 249]}]}

Here is the task supervisor on outcall@127.0.0.1:

      {Task.Supervisor, name: Outcall.TaskSupervisor}
    ]
    
    Supervisor.start_link(children, [strategy: :one_for_one, name: ElixirOutcall.Supervisor])

The interesting this is that the task works fine when run directly from IEx:

iex(communicate@127.0.0.1)6>     supervisor = {Outcall.TaskSupervisor, :"outcall@127.0.0.1"}
{Outcall.TaskSupervisor, :"outcall@127.0.0.1"}
iex(communicate@127.0.0.1)7>     Task.Supervisor.async(supervisor, Kernel, :node, []) |> Task.await()
:"outcall@127.0.0.1"