例えばさ
https://r2---sn-3pm76n7d.googlevideo.com/videoplayback?ms=au%2Crdu&;mv=m&mt=1523102304&
dur=468.718&id=o-AJL3jVTNf2KmPQGOrUBoRbhIdh-qwUfniilMYzqzVCka&pl=23&lmt=1514352792558550&
ratebypass=yes&ipbits=0&mn=sn-3pm76n7d%2Csn-3pm7snez&mm=31%2C29&ip=118.4.81.167&fvip=2&
initcwndbps=1037500&sparams=dur%2Cei%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime
%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cexpire&requiressl=yes&
signature=6A22D5232836196EC0361F45906DB5AE1B199F15.3AF233424FA68F1481221CAE646CC364BEF9CEC6&
itag=22&ei=lLLIWqOcE5q6gQP1m6aIAQ&c=WEB&expire=1523123956&key=yt6&mime=video%2Fmp4&source=youtube
このURLをブラウザに張り付けると直リンに飛んでダウンロードできるじゃん？
でもgetter1に張り付けると403になるじゃん？
なんでか分かる人いる？