Dart Frog Dart

// routes/pixel.gif.dart: the file name is the route.
import 'dart:convert';

import 'package:dart_frog/dart_frog.dart';

final _gif = base64Decode('R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==');

Response onRequest(RequestContext context) {
  return Response.bytes(
    body: _gif,
    headers: {'content-type': 'image/gif', 'cache-control': 'no-store'},
  );
}