Service Worker 中的范围请求
现在已经修复
媒体元素使用范围请求，当通过 sw 时，被标记为 no-cors 请求，并把 Range 请求头移除
为什么要删除没有明确的规范
However, media elements piece multiple responses together and treat it as a single resource, and that opens up an interesting attack vector: Can known data be mixed with unknown data to reveal the content of the unknown data?
Firefox 允许重定向后把不同源的内容组合在一起，能看到未知资源的长度。