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The Application Settings tab of the Administration Console allows you to see, and in some cases, configure several important aspects of your application:
The Basics section of the Application Settings screen allows you to:
In addition to receiving and responding to HTTP requests, App Engine applications can also receive requests via other protocols. To receive requests via a non-HTTP protocol, you must enable it in your application's configuration file.
App Engine currently supports receiving inbound mail and XMPP requests. The following links provide information about how to configure these services.
App Engine uses Google Apps to manage domains. To change the domain where your app is hosted, click Add Domain and enter the new domain. For more information, see Deploying Your Application on Your Google Apps URL.
If you wish to make your datastore read-only, click Disable Writes. This setting causes all attempts to write to your datastore to fail. Once you've disabled writes, any attempts to write to that datastore throw a capability disabled error. You can re-enable writes by clicking the Re-Enable Writes link.
As a safety measure to prevent inadvertent deletion, App Engine requires you to first disable your application before deleting it. Only after you have first disabled your app are you allowed to delete it permanently.
You don't have to delete a disabled app; you can simply leave it disabled if you wish. In the disabled state, your application stops serving requests but retains its data and state; you can continue to manage the app in the Administration Console and you can re-enable it. After you request permanent deletion, App Engine imposes a waiting period of approximately 72 hours before actually deleting the application. During this waiting period, you can cancel the deletion request. Once your application is actually deleted, however, you cannot recover its state or data. Only its application ID remains (and this can never be re-used).
Warning: Disabling your application does not automatically disable billing. If you disable your app but do not disable billing, your app can continue to incur billing costs even though it is disabled.
Each developer account starts with a 10-app limit. If an app is deleted, the developer who requested deletion (doesn't have to be the app's creator) receives the "credit" for the deleted app and can then create one additional app. Anyone marked as a Developer for the app in the Permissions tab of the Administration Console can request deletion of the app, but all developers are notified by email and any developer can revert the request for deletion.
To disable or delete your application,
To re-enable your disabled application, click Re-Enable Application.