// obtainCertificates obtains certificates from the CA server for // the configurations in serverConfigs using client. func obtainCertificates(client *acme.Client, serverConfigs []server.Config) ([]acme.CertificateResource, map[string]error) { var hosts []string for _, cfg := range serverConfigs { hosts = append(hosts, cfg.Host) } return client.ObtainCertificates(hosts, true) }