在使用了spring-cloud-starter-gateway后，为什么还会发生cors问题

//1.需要配置类
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.reactive.CorsWebFilter;
import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;
import org.springframework.web.util.pattern.PathPatternParser;

@Configuration
public class CorsConfig {
    @Bean
    public CorsWebFilter corsFilter() {
        CorsConfiguration config = new CorsConfiguration();
        config.addAllowedMethod("*");
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());
        source.registerCorsConfiguration("/**", config);
        return new CorsWebFilter(source);
    }
}
//2.yml文件配置
spring:
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: service-acl #nacos中的服务名
          uri: lb://service-acl #转发的路径
          predicates:
            - Path=/*/acl/** #断言，若路径包含acl则转发给service-acl处理
//3.将原来控制器上的@CrossOrigin注解全部去掉