403. That’s an error.

Your client does not have permission to get URL /api/manifest/dash/expire/1575844379/ei/uiXtXbSwOsPq8wS07a-gDw/ip/138.128.6.119/id/bf0ac4dff26cbaa3/source/youtube/requiressl/yes/playback_host/r4---sn-ab5sznld.googlevideo.com/mm/31%2C29/mn/sn-ab5sznld%2Csn-ab5l6nzd/ms/au%2Crdu/mv/m/mvi/3/pl/20/hfr/all/as/fmp4_audio_clear%2Cwebm_audio_clear%2Cwebm2_audio_clear%2Cfmp4_sd_hd_clear%2Cwebm2_sd_hd_clear/initcwndbps/993750/mt/1575822646/fvip/4/fexp/23842630/itag/0/sparams/expire%2Cei%2Cip%2Cid%2Csource%2Crequiressl%2Chfr%2Cas%2Citag/sig/ALgxI2wwRgIhAK2IKiR7HGo-GEdk6y1btsLS1R-cULQ_vmjgHdj_YsRRAiEAm1iHe6JwAqn5w-1wXfL7N1v6icr4UGVlWQNgXsRC6Q4%3D/lsparams/playback_host%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps/lsig/AHylml4wRgIhAJbCuTwjxamFcwAzOLs8kiDrFqE3lTK0YSUf7rCxUZdyAiEApRlXFN57nS8bxx2Z9DtWm2XXkN5x3BOmF1Vntl8hYSo%3D from this server. That’s all we know.