Need guidance on how to deploy changes to App Engine.

[Mesam Haider]

Hi Google Support! 

I want to know how i can deploy changes to the App Engine, once my Web service has been deployed once already. Can you please advise? The last time i did a redeploy, my application broke. 

[George (Cloud Platform Support)]

Hi Mesam, 

What you did was the right thing. One has to re-deploy the app, there is no way around it, as you can't update just desired parts of it that you had modified. To avoid breaking a working version when deploying updates, you may decide to deploy the modified app as a separate version, and test it this way, until it works as expected.