@godblessstrawberry I did not obtain any m3u8 extension file in Community tab of Developer Applications in chrome browser. Could you make sure you advise me exactly what is the problem? Thanks It was supposed like a privacy measure: it tells browsers and caches that the response consists of delicate information https://getsocialpr.com/story22685610/%E4%BB%AE%E6%83%B3%E9%80%9A%E8%B2%A8%E3%82%AB%E3%82%B8%E3%83%8E-%E3%81%8A%E3%81%99%E3%81%99%E3%82%81-an-overview