static NanoHTTPD.Response serveFile_maxCache(File file) {
  ret serveFile(file, "application/octet-stream");
}

static NanoHTTPD.Response serveFile_maxCache(File file, S mimeType) ctex {
  NanoHTTPD.Response r = NanoHTTPD.newFixedLengthResponse(NanoHTTPD.Status.OK, mimeType, new FileInputStream(file), file.length());
  r.addHeader("Pragma", "public");
  r.addHeader("Cache-Control", "max-age=86400");
  ret r;
}