The task will be delivered to the App Engine application hostname
specified by its
AppEngineHttpQueue
and
AppEngineHttpRequest.
The documentation for
AppEngineHttpRequest
explains how the task's host URL is constructed.
google.cloud.tasks_v2beta3.types.AppEngineRouting
Overrides for the [task-level
app_engine_routing][google.cloud.tasks.v2beta3.AppEngineHttpRequest.app_engine_routing].
If set, app_engine_routing_override is used for all
tasks in the queue, no matter what the setting is for the
[task-level
app_engine_routing][google.cloud.tasks.v2beta3.AppEngineHttpRequest.app_engine_routing].