gRPC

Set on TransportConfig.grpc.

GrpcConfig

Field	Type	Description
`authority`	string	`:authority` pseudo-header
`serviceName`	string	gRPC service name
`multiMode`	bool	Multi-stream mode
`idleTimeout`	int32	Idle timeout (seconds)
`healthCheckTimeout`	int32	Health check timeout
`permitWithoutStream`	bool	Allow pings without active stream
`initialWindowsSize`	int32	Initial window size
`userAgent`	string	User-Agent override

{
  "transport": {
    "grpc": {
      "serviceName": "GunService",
      "multiMode": true
    },
    "tls": { "serverName": "example.com" }
  }
}