apiClient
API client identification.
The value is a space-separated list of NAME "/" SEMVER strings, where the NAME should only contain lowercase letters, digits, and "-", and the SEMVER should be a semantic version string.
For example: X-Goog-Api-Client: python/3.5.0 grpc-google-pubsub-v1/0.1.0-beta2 linux/2.7.0.
This variable corresponds to the X-Goog-Api-Client HTTP header.