code: func GetConnectionHelper(daemonURL string) (*ConnectionHelper, error) {
  	u, err := url.Parse(daemonURL)
  	if err != nil {
  		return nil, err
  	}
  
  	fn, ok := helpers[u.Scheme]
  	if !ok {
  		return nil, nil
  	}
  
  	return fn(u)
  }
docs: // GetConnectionHelper returns BuildKit-specific connection helper for the given URL.
  // GetConnectionHelper returns nil without error when no helper is registered for the scheme.