I am using the /playlists and /playlistItems endpoints. Right now I am storing the etag for the playlists resource, but I'm not sure whether that etag will change if videos are added to the playlist. Do I also need to save etags from the playlistItems request?
If so, I noticed that each page of 50 videos in playlistItems has its own etag. If a video is added to end of the playlist, will the first page sent have a changed etag? I couldn't find where YouTube documents etag behaviour like this in their docs.