apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/component/AdminServiceAddressLocator.java/AdminServiceAddressLocator/getAdminServerAddress
class AdminServiceAddressLocator:  private ServiceDTO[] getAdminServerAddress(Env env) {
    String domainName = portalMetaDomainService.getDomain(env);
    String url = domainName + ADMIN_SERVICE_URL_PATH;
    return restTemplate.getForObject(url, ServiceDTO[].class);
  }