sentinel流控时web的OPTIONS请求跨域

sentinel流控时，web的OPTIONS请求跨域问题

添加HandlerInterceptor、WebMvcConfigurer.addCorsMappings层级的跨域配置都不会生效

原因在于sentinel流控执行的声明周期高于以上层级，需要按如下配置CorsFilter层级的跨域设置

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

@Configuration
public class CustomCORSConfiguration {
    private CorsConfiguration buildConfig(){
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedHeader("*"); // 允许任何的head头部
        corsConfiguration.addAllowedOrigin("*"); // 允许任何域名使用
        corsConfiguration.addAllowedMethod("*"); // 允许任何的请求方法
        corsConfiguration.setAllowCredentials(true);
        return corsConfiguration;
    }

    // 添加CorsFilter拦截器，对任意的请求使用
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }
}