The URL of the discovery document containing the resource’s
JSON schema. For example:
“https://www.googleapis.com/discovery/v1/apis/compute/v1/rest”
This value is unspecified for resources that do not have an
API based on a discovery document, such as Cloud Bigtable.
The REST URL for accessing the resource. An HTTP GET
request using this URL returns the resource itself. For
example:
“https://cloudresourcemanager.googleapis.com/v1/projects/my-
project-123” This value is unspecified for resources without
a REST API.
The content of the resource, in which some sensitive fields
are removed and may not be present.