启用日志流，然后你就能找出问题所在:

Enable Log Streamming, then you'll be able to figure out what the problem is:

https://docs.microsoft.com/en-us/azure/app-service/troubleshoot-diagnostic-logs

作为另一种选择，您还可以使用 Application Insights 检测您的应用程序:

As another option, you can also instrument your application with Application Insights:

https://docs.microsoft.com/en-us/azure/azure-monitor/app/nodejs