This sample shows how to make an authenticated request by retrieving a JSON Web Tokens (JWT) from the metadata server.

For more details on how to work with this sample read Authenticating service-to-service.

Note You cannot query an instance's metadata from another instance or directly from your local computer. For testing purposes, this sample uses the environment variable, "GOOGLE_CLOUD_PROJECT", to determine local or instance environment. To run tests locally, make sure environment variable, "GOOGLE_CLOUD_PROJECT", is not set.