Using invalidation to transfer new content can be difficult when invalidating multiple objects. The action can be a flush or an invalidation of the cache block. HTTP defines three basic mechanisms for controlling caches&colon; freshness, validation, and invalidation. "Cache invalidation" can be used to push new content to a client. Labor law proved a more fruitful opportunity for the invalidation of the reserve clause. Nonetheless, he agreed that "Mayo" compelled invalidation of this patent. Caban said she would challenge the invalidation of over 100 ballots in court. The invalidation of a will and testament using sharia instructions was an example. The Ottoman Empire, meanwhile, had not heard of Cesarini's invalidation of the treaty. The invalidation of Hill's election caused some controversy in Australian political life. Those halls remained closed after the task force invalidation. The insignia was abolished with invalidation of the act on 3 January 1986.