The new MIME type appears in the following places: https://www.iana.org/assignments/media-types/media-types.xhtml#application https://hg.python.org/cpython/file/tip/Lib/mimetypes.py
Using data URIs for passing the decrypted M3U8 manifest, which is supported by ffmpeg only.
The proxy is currently broken. See #5655 and zhuzhuor/Unblock-Youku#427