Usually grpc connections are left open after a message is sent and received. And since it's based on h2, multiple message streams can be multiplexed over a sing

Usually grpc connections are left open after a message is sent and received. And since it's based on h2, multiple message streams can be multiplexed over a single connection. That is part of the benefit of grpc, establish a long lived connection and send your messages as needed. Similar to using keep-alive with http.