Исправлена ошибка WebSocket

src/main/java/ru/serega6531/packmate/ApplicationConfiguration.java

@@ -56,6 +56,8 @@ public class ApplicationConfiguration extends WebSecurityConfigurerAdapter imple
 
     @Override
     public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
-        registry.addHandler(webSocketHandler, "/api/ws").withSockJS();
+        registry.addHandler(webSocketHandler, "/api/ws")
+                .setAllowedOrigins("*")
+                .withSockJS();
     }
 }

src/main/java/ru/serega6531/packmate/PackmateApplication.java

@@ -7,9 +7,11 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.context.event.EventListener;
 import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.web.socket.config.annotation.EnableWebSocket;
 
 @SpringBootApplication
 @EnableScheduling
+@EnableWebSocket
 public class PackmateApplication {
 
     @Value("${enable-capture}")