http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/
"email": "your-service-account-email@your-project.iam.gserviceaccount.com", "aliases": [ "your-service-account-email@your-project.iam.gserviceaccount.com", "your-project:your-service-account-email" ], "scope": "https://www.googleapis.com/auth/cloud-platform" http://metadata
Without this header, the server responds with a 403 Forbidden error. This prevents accidental or malicious cross-site request forgery (CSRF) from external websites. http://metadata