Let's create the bean definition of these filters, as follows:

@EnableZuulProxy
@EnableDiscoveryClient
@SpringBootApplication
public class ApiZuulServiceApplication {
public static void main(String[] args) {
SpringApplication.run(ApiZuulServiceApplication.class, args);
}
@Bean
public PreFilter preFilter() {
return new PreFilter();
}
@Bean
public PostFilter postFilter() {
return new PostFilter();
}
@Bean
public ErrorFilter errorFilter() {
return new ErrorFilter();
}
@Bean
public RouteFilter routeFilter() {
return new RouteFilter();
}
}

Let's run the preceding class again and access any public API Gateway service for Customer or Account and check the console of the eclipse:

As you can see in the console log, as we have refreshed the http://192.168.225.208:8080/api/customers/customer/1001 API call, all filters are executed and print log on the console, respectively.