content: package org.chatapp.backend.config;
  
  import org.springframework.context.annotation.Configuration;
  import org.springframework.messaging.simp.config.MessageBrokerRegistry;
  import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
  import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
  import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
  
  @Configuration
  @EnableWebSocketMessageBroker
  public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
      @Override
      public void registerStompEndpoints(StompEndpointRegistry registry) {
          registry.addEndpoint("/api/ws") // Clients connect to
                  .setAllowedOriginPatterns("*")
                  .withSockJS();
      }
  
      @Override
      public void configureMessageBroker(MessageBrokerRegistry registry) {
          registry.enableSimpleBroker("/topic", "/user"); // Clients subscribe to /topic/abc
          registry.setApplicationDestinationPrefixes("/app"); // Clients send to /app/xyz
          registry.setUserDestinationPrefix("/user");
      }
  }
  