apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/configuration/LdapProperties.java/LdapProperties/determineUrls
class LdapProperties:  public String[] determineUrls(Environment environment) {
    if (ObjectUtils.isEmpty(this.urls)) {
      return new String[]{"ldap://localhost:" + determinePort(environment)};
    }
    return this.urls;
  }