我有一个带有gRPC流的服务器。在一个客户端（之前订阅了该流）取消订阅后，我得到了这个错误rpc error: code = Unavailable desc = transport is closing
在我启用了更详细的日志之后，我看到了这个警告grpc: Server.Serve failed to create ServerTransport: connection error: desc = "transport: http2Server.HandleStreams failed to receive the preface from client: EOF"，并且每秒都会收到几次。有什么问题？
客户端

stream, err := s.stream.GetStreamClient(metadata.AppendToOutgoingContext(ctx,"key","value"),&sub.StreamRequest{})
for {
   resp, err := stream.Recv()
   if err != nil {
       stream.CloseSend()
       return
}
....
}

客户端也可以在超时后调用stream.CloseSend()
服务器

GetStreamClient(req *sub.StreamRequest, stream pb.StreamClient) error { 
for {
    err := stream.Send()
    if err != nil {
    //log error
    return
    }
  }
}