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 {@Beanpublic 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: trueroutes:- 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