code: func (p *peer) RequestNodeData(hashes []common.Hash) error {
  	p.Log().Debug("Fetching batch of state data", "count", len(hashes))
  	return p2p.Send(p.rw, GetNodeDataMsg, hashes)
  }
docs: // RequestNodeData fetches a batch of arbitrary data from a node's known state
  // data, corresponding to the specified hashes.