I am trying to pull messages from a Google Cloud Pub/Sub Subscription using the Google Cloud Client Library for Go (https://godoc.org/cloud.google.com/go/pubsub).
I am going through an HTTP proxy that uses TLS interception, so I need the pubsub client (it appears to be using gRPC) to use a custom CA cert bundle for its request verification. How can I make this work? Also, is there a way to configure proxy support other than setting http_proxy and https_proxy?