The W3C estimate instantly down below makes clear that this isn't the situation; somewhat, the no-cache header just implies that the reaction need to be revalidated in advance of currently being reused to serve subsequent requests. Setting a lengthy-ago Previous-Modified has no influence on caching, other than letting a cached https://getidealist.com/story22856167/little-known-facts-about-%E4%BB%AE%E6%83%B3%E9%80%9A%E8%B2%A8-%E3%82%AB%E3%82%B8%E3%83%8E-%E3%82%B3%E3%82%A4%E3%83%B3