code: func (cli *Client) SwarmGetUnlockKey(ctx context.Context) (types.SwarmUnlockKeyResponse, error) {
  	serverResp, err := cli.get(ctx, "/swarm/unlockkey", nil, nil)
  	defer ensureReaderClosed(serverResp)
  	if err != nil {
  		return types.SwarmUnlockKeyResponse{}, err
  	}
  
  	var response types.SwarmUnlockKeyResponse
  	err = json.NewDecoder(serverResp.body).Decode(&response)
  	return response, err
  }
docs: // SwarmGetUnlockKey retrieves the swarm's unlock key.