@CheckReturnValue
    public HttpResponse getApplications(Iterable<String> regions) {
        return getApplications(APPS, requireNonNull(regions, "regions"));
    }
Retrieves the registry information whose regions are the specified {@code regions} from the Eureka.
eureka/src/main/java/com/linecorp/armeria/internal/common/eureka/EurekaWebClient.java