Что это за ссылка и для чего нужна ?????

 using (HttpRequest reqFull1 = new HttpRequest()) 
                        { 
                            reqFull1.KeepAlive = false; 
                            reqFull1[HttpHeader.Accept] = "application/x-mpegURL, application/vnd.apple.mpegurl, application/json, text/plain"; 
                            reqFull1[HttpHeader.Referer] = $"https://twitch.tv/{channelTwitch}"; 
                            reqFull1[HttpHeader.UserAgent] = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.122 Safari/537.36"; 
                            reqFull1.EnableEncodingContent = false; 
                            usher = reqFull1.Get("https://usher.ttvnw.net/api/channel/hls/" + ".m3u8?acmb=e30=&allow_source=true&fast_bread=true&p=" + new Random().Next(1111111, 9999999).ToString() + "&player_backend=mediaplayer&playlist_include_framerate=true&reassignments_supported=true&sig=" + sig + "&supported_codecs=avc1&token=" + token + "&cdm=wv&player_version=1.18.0").ToString(); 
                            videolink = "https://video-weaver" + usher; // Simplified for brevity 
                        }