code: func DiscoverWalk(app App, insecure discovery.InsecureOption, discoverFn DiscoverWalkFunc) (err error) {
  	var (
  		eps *Endpoints
  	)
  
  	parts := strings.Split(string(app.Name), "/")
  	for i := range parts {
  		end := len(parts) - i
  		pre := strings.Join(parts[:end], "/")
  
  		eps, err = doDiscover(pre, app, insecure)
  		if derr := discoverFn(pre, eps, err); derr != nil {
  			return derr
  		}
  	}
  
  	return
  }
docs: // DiscoverWalk will make HTTPS requests to find discovery meta tags and
  // optionally will use HTTP if insecure is set. Based on the response of the
  // discoverFn it will continue to recurse up the tree.