Buffalo Auth Tutorial - modification in the AuthCallback

auth.go

func AuthCallback(c buffalo.Context) error {
	user, err := gothic.CompleteUserAuth(c.Response(), c.Request())
	if err != nil {
		return c.Error(401, err)
	}
	session := c.Session()
	session.Set("userID", user.UserID)
	err = session.Save()
	if err != nil {
		return c.Error(401, err)
	}
	return c.Redirect(http.StatusMovedPermanently, "/secure")
}