编写一个gulp.babel.js文件，自动将typescript转换为javascript。代码工作得非常好。当我在heroku中部署它时，服务器在控制台中运行。但当我点击url时，它会抛出code = 81 desc =“Blank app”，状态= 502.在heroku仪表板中，它显示正在构建中
以下是运行gulp default后的控制台信息。
[14:00:34] Using gulpfile /tmp/build_f0d352ab88ee7fb003beb657b26666ed/gulpfile.babel.js
[14:00:34] Starting 'compile'...
[14:00:34] Starting 'watch'...
[14:00:34] Finished 'watch' after 31 ms
[14:00:37] Finished 'compile' after 3.67 s
[14:00:37] Starting 'serve'...
[14:00:38] Finished 'serve' after 45 ms
[14:00:38] Starting 'default'...
[14:00:38] Finished 'default' after 49 μs
[14:00:38] [nodemon] 1.17.5
[14:00:38] [nodemon] to restart at any time, enter `rs`
[14:00:38] [nodemon] watching: *.*
[14:00:38] [nodemon] starting `node build/server.js`
Server Started! on port40389
错误讯息：
2018-06-01T14:10:39.398389+00:00 heroku[router]: at=info code=H81 desc="Blank app" method=GET path="/favicon.ico" host=fierce-wave-37614.herokuapp.com request_id=dc7d845a-1e4d-4605-856e-aef1ff5d269a fwd="49.206.118.84" dyno= connect= service= status=502 bytes= protocol=https