static S serveTextFile(S uri, S name) {
  //print("sts: " + quote(uri));
  S prefix = "/download/";
  if (swic(uri, prefix)) {
    uri = dropFirst(l(prefix), uri);
    //print("sts: " + quote(uri));
    if (eqic(name, uri)) {
      S content = loadProgramTextFile(name);
      if (content == null) content = "<not found>";
      if (empty(content)) content = "<empty>";
      //print("sts content length: " + l(content));
      ret htmlencode(content); // hm. content-type?
    }
  }
  ret null;
}