Test a different strategy to check for ws origin

elixir/apps/web/lib/web/endpoint.ex

@@ -39,7 +39,6 @@ defmodule Web.Endpoint do
 
   socket "/live", Phoenix.LiveView.Socket,
     websocket: [
-      check_origin: :conn,
       connect_info: [
         :trace_context_headers,
         :user_agent,

elixir/config/runtime.exs

@@ -82,6 +82,10 @@ if config_env() == :prod do
       path: external_url_path
     ],
     secret_key_base: compile_config!(:secret_key_base),
+    check_origin: [
+      "#{external_url_scheme}://#{external_url_host}",
+      "#{external_url_scheme}://*.#{external_url_host}"
+    ],
     live_view: [
       signing_salt: compile_config!(:live_view_signing_salt)
     ]