useragent property

Implementation

static String? get useragent
{
  if (io.Platform.isIOS)     return  "ios";
  if (io.Platform.isAndroid) return  "android";
  if (io.Platform.isMacOS)   return  "macos";
  if (io.Platform.isWindows) return  "windows";
  if (io.Platform.isLinux)   return  "linux";
  if (io.Platform.isFuchsia) return  "fuchsia";
  return null;
}