Hi @jackliu,
Welcome to Google Cloud Community
The HTTP 503 Service Unavailable error is a server-side error that indicates that the server is currently unable to handle the request due to a temporary overload or maintenance. This error is usually temporary, and the server will be able to handle the request again after a short period of time. If you continue to see this error, it may be due to a number of issues, including:
The server is experiencing a high volume of traffic and is unable to handle all of the requests.
The server is undergoing maintenance and is temporarily unavailable.
There is an issue with the server that is preventing it from handling requests.
If you are seeing this error consistently, you may want to try the following troubleshooting steps:
Check the status of the App Engine service by visiting the GCP Status Dashboard (
https://status.cloud.google.com/). If there are any known issues or outages with the App Engine service, they will be listed here.
Check the logs for your App Engine application for any error messages or issues that may be causing the error. You can access the logs from the GCP Console or using the Cloud Logging API.
Check the resource usage of your App Engine application. If your application is using more resources than it has available (e.g. CPU, memory, etc.), this can cause the 503 error. You can monitor the resource usage of your application in the GCP Console.
Thank you
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