403. That’s an error.

Your client does not have permission to get URL /api/manifest/dash/requiressl/yes/source/youtube/id/44a7ae1f993701bf/itag/0/ei/lFPmXIbSEt6BmLAP8veioAU/playback_host/r3---sn-aigl6nek.googlevideo.com/mm/31%2C29/mn/sn-aigl6nek%2Csn-aigzrn7z/ms/au%2Crdu/mv/m/pl/64/hfr/all/as/fmp4_audio_clear%2Cwebm_audio_clear%2Cwebm2_audio_clear%2Cfmp4_sd_hd_clear%2Cwebm2_sd_hd_clear/initcwndbps/295000/mt/1558598385/fvip/3/beids/9466588/ip/2a03%3Ab0c0%3A1%3Ad0%3A%3Abda%3A1/ipbits/0/expire/1558620148/sparams/ip%2Cipbits%2Cexpire%2Crequiressl%2Csource%2Cid%2Citag%2Cei%2Cplayback_host%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Chfr%2Cas%2Cinitcwndbps/signature/434DC8C7F1D213D383910EB6FCFD22B90DCAD1AC.E79E7E7F5688936DD532D92C2788F117264D284F/key/yt8 from this server. That’s all we know.