code: func (cli *Client) SwarmInit(ctx context.Context, req swarm.InitRequest) (string, error) {
  	serverResp, err := cli.post(ctx, "/swarm/init", nil, req, nil)
  	defer ensureReaderClosed(serverResp)
  	if err != nil {
  		return "", err
  	}
  
  	var response string
  	err = json.NewDecoder(serverResp.body).Decode(&response)
  	return response, err
  }
docs: // SwarmInit initializes the swarm.