static bool subBot_isHttps() {
  O httpd = subBot_httpd();
  ret eqOneOf(httpd,
    getOpt(mainBot(), 'serveHttps_server),
    getOpt(mainBot(), 'serveHttpsWithWebsockets_server))
    || contains((Collection) getOpt(mainBot(), 'serveHttpsWithWebsockets_multiplePorts_servers), httpd);
}