Retrieve the HTTP Live Streaming / HLS playlist that can be used by a HLS capable player for a given Activity Id. This playlist is dynamically generated, so do not create it by hand, always use this API call. The results of this call may be cached. The subtitles track contains the Summary frame timestamps in WEBVTT format.
When processing this HLS playlist, calls to the sub-playlists and the media elements must utilize the same Authentication tokens as regular API calls.
This API call will include Cache-Control headers in the response that must be honored. The cache duration is 10 sec for an activity in progress and the cache duration for a completed activity is the lifetime of that activity.