When installed as a middleware it sets 4 headers, disabling lots of browser caching. That is the entire list of the up-to-date headers. , to inform the server to not use its possess cache system when responding. This is often unrelated on the browser/server dynamic, and more about the server/databases https://bookmarkoffire.com/story20895586/%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-an-overview