Together with the headers think about serving your website page through https. Lots of browsers will never cache https by default. ヤフーのニュースで最近×しないと消せない広告が出るようになりましたうっとうしいのですが・・・これを出さないようにする方法ってありますか If you don't care about IE6 and its damaged caching when serving internet pages in excess of HTTPS with only no-retailer, ... https://www.aeroindustrial.com/product/skyvisor-solar-autonomia-en-inspeccion-de-paneles/