static SS guessMimeTypeFromFileName_map = litmap(
  ".css", "text/css",
  ".js", "text/javascript",
);

sS guessMimeTypeFromFileName(S name, S defaultMimeType default binaryMimeType()) {
  // We do some mime types ourselves, leave the rest to the JDK function
  
  try answer guessMimeTypeFromFileName_map.get(fileExtension(name));
  
  ret or2(URLConnection.guessContentTypeFromName(name), defaultMimeType);
}