docs: private void registerWebSockets(Injector injector) {
  
      Map<Key<?>, Binding<?>> allBindings = injector.getAllBindings();
  
      // loop all the Guice bindings looking for @ServerEndpoint singletons
      for (Map.Entry<Key<?>, Binding<?>> entry : allBindings.entrySet()) {
  
        final Binding<?> binding = entry.getValue();
        binding.acceptScopingVisitor(new DefaultBindingScopingVisitor() {
  
          @Override
          public Object visitEagerSingleton() {
            // also a eager singleton so register it
            registerWebSocketEndpoint(binding);
            return null;
          }
        });
      }
    }