Hi I am trying to send a subscription to server that is using absinthe graphql.
But I got an error in client side and server side.
in client side(flutter)

 Connecting to websocket: ws://192.168.1.11:4000/socket...
There was an error causing connection lost: WebSocketException: Connection to 'http://192.168.1.11:4000/socket#' was not upgraded to websocket

and in my phoenix application

[info] GET /socket
[debug] ** (Phoenix.Router.NoRouteError) no route found for GET /socket (JaangWeb.Router)

So I don’t know what is causing this error.
in endpoint.ex

  socket "/socket", MyAppWeb.UserSocket,
    websocket: true,
    longpoll: false

in application.ex

def start(_type, _args) do
    children = [
      MyAppWeb.Endpoint,
      {Absinthe.Subscription, MyAppWeb.Endpoint}
    ]

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

in user_socket.ex

  use Absinthe.Phoenix.Socket, schema: MyAppWeb.Schema

What else should I check?