private HttpResponse getApplications(String path, Iterable<String> regions) {
        if (!Iterables.isEmpty(regions)) {
            final QueryParams queryParams = QueryParams.of("regions", String.join(",", regions));
            path = path + '?' + queryParams.toQueryString();
        }
        return sendGetRequest(path);
    }
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