Cloud Client Libraries for Java
Details about the configuration file that is used to configure App Engine deployed versions.
Details about the configuration file that is used to route incoming requests to a specific service based on the path or hostname in the URL.
Details about the configuration file used to define the Datastore indexes of the data in your app.
Details about the configuration file used to define the App Engine task queues in your app.
Details about the deployment descriptor that Java web applications use map URLs map to servlets.
Request Headers and Responses
App Engine Tools Reference
The APIs in this section are still supported, but are no longer recommended. Instead, use the Cloud client libraries.
Apps that use these superseded APIs will need to migrate to the Cloud client libraries and other services before upgrading to newer Google Cloud runtimes or other environments that support Java.