code: func (c *Controller) Redirect(val interface{}, args ...interface{}) Result {
  	c.setStatusIfNil(http.StatusFound)
  
  	if url, ok := val.(string); ok {
  		if len(args) == 0 {
  			return &RedirectToURLResult{url}
  		}
  		return &RedirectToURLResult{fmt.Sprintf(url, args...)}
  	}
  	return &RedirectToActionResult{val, args}
  }
docs: // Redirect to an action or to a URL.
  //   c.Redirect(Controller.Action)
  //   c.Redirect("/controller/action")
  //   c.Redirect("/controller/%d/action", id)