gRPC uses the following features from HTTP/2: Framing (needed to multiplex different RPCs on the same TCP connection), Flow Control (both intra-stream and conne

gRPC uses the following features from HTTP/2: Framing (needed to multiplex different RPCs on the same TCP connection), Flow Control (both intra-stream and connection-wide), HPAC (for compressing metadata that tends to be common across requests), and GoAway (to gracefully drain backends).