Why can't connect to websocket?

Question

Spring

@SpringBootApplication
public class Main {

    public static void main(String[] args) {
        SpringApplication.run(Main.class, args);
    }
}

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/topic");
        config.setApplicationDestinationPrefixes("/app");
    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/chat");
        registry.addEndpoint("/chat").withSockJS();
    }
}

@Controller
public class SocketController {

    @MessageMapping("/chat")
    @SendTo("/topic/messages")
    public OutputMessage send(Message message) {
        String time = new SimpleDateFormat("HH:mm").format(new Date());
        return new OutputMessage(message.getFrom(), message.getText(), time);
    }

}