@Bean
    CorsConfigurationSource corsConfigurationSource() {
        return new CorsConfigurationSource() {
            @Override
            public CorsConfiguration getCorsConfiguration(HttpServletRequest request) {
                var cors = new CorsConfiguration();
                cors.setAllowedOrigins(List.of("*"));
                cors.setAllowedMethods(List.of("GET", "POST", "PUT", "DELETE", "OPTIONS"));
                cors.setAllowedHeaders(List.of("*"));
                return cors;
            }
        };
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        // @formatter: off
        http
                .csrf()
                .disable()
                .cors()
                .configurationSource(corsConfigurationSource())
                .and()
                .exceptionHandling()

Còn đây là config websocket

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("/websocket")
                .setAllowedOriginPatterns("*").withSockJS();
    }

Và khi em connect socket ở bên FE thì lỗi như này nè a :(

Access to XMLHttpRequest at 'http://localhost:8082/emaf/api/v1/websocket/info?t=1669656213092' from origin 'http://127.0.0.1:5500' has been blocked by CORS policy: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.
</pre>
Mong a hướng dẫn e cách fix bên BE ạ.