@Bean
    @Order(-100)
    @ConditionalOnProperty(name = "shenyu.cross.enabled", havingValue = "true")
    public WebFilter crossFilter(final ShenyuConfig shenyuConfig) {
        return new CrossFilter(shenyuConfig.getCross());
    }
Cross filter.
if you application has cross-domain.
this is demo.
1. Customize webflux's cross-domain requests.
2. Spring bean Sort is greater than -1.

@param shenyuConfig the shenyu config
@return the web filter
shenyu-spring-boot-starter/shenyu-spring-boot-starter-gateway/src/main/java/org/apache/shenyu/springboot/starter/gateway/ShenyuConfiguration.java