IssueTracker

Problem you have encountered:

During subsequent deployment of a standard environment, manually scaled PHP service to App Engine, when an old instance is being terminated the request to /_ah/stop results in a 500 response.

What you expected to happen:

The requests to /_ah/stop should result in a 200 response

Steps to reproduce:

• Perform an initial deployment and wait for it to complete:
  gcloud app deploy app.default.yaml --ignore-file=.gcloudignore
• Deploy a second time and wait for it to complete
  gcloud app deploy app.default.yaml --ignore-file=.gcloudignore

Other information (workarounds you have tried, documentation consulted, etc):

A minimal demo project can be found here. The README explains the problem in detail.

Using gcloud app deploy results in the /_ah/stop request propagating to the deployed PHP code when it shouldn't. Manually deleting an instance using the GCP console correctly intercepts the request to /_ah/stop before it reaches the deployed PHP code.