标签： caching youtube browser-cache offline-caching http-caching
我很想知道youtube视频缓存。
通过研究实际负责视频内容的网址后，我发现它们本质上过于动态，基于网址缓存它们几乎是不可能的。
ex url - https://r1---sn-o3o-cvhe.googlevideo.com/videoplayback?fexp=9405969%2C9408215%2C9416126%2C9420452%2C9422596%2C9422781%2C9423660%2C9423662%2C9424135%2C9426943%2C9427036%2C9427902%2C9428399%2C9429315%2C9429352%2C9429923%2C9431261&itag=247&clen=27606044&keepalive=yes&key=yt6&upn=h76l3Me-Z5U&sver=3&dur=142.000&ipbits=0&initcwndbps=13781250&pcm2cms=yes&sparams=clen%2Cdur%2Cgcr%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpcm2cms%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&lmt=1455539528057700&gir=yes&expire=1459450714&gcr=in&mv=m&id=o-ACb0u5vw3dhRbBs7zcsNK93Ni7RA2Wazh8dBCZvFZLAw&ms=au&source=youtube&mm=31&mn=sn-o3o-cvhe&pl=24&mt=1459428863&ip=103.21.125.77&mime=video%2Fwebm&requiressl=yes&cpn=chXTzESYb8N9EdnF&alr=yes&ratebypass=yes&signature=4746B746901E60BEC12FDC9C6EA5357BF9AF254E.2BD3F3CF6C77106C73211F2231D91DF3AE340B68&c=WEB&cver=1.20160329&range=13804074-15885122&rn=28&rbuf=57430
URL有许多查询字符串参数，它们甚至不遵循顺序和一些变化的参数，如签名，范围等。
他们是否故意生成此类网址？
有没有其他方法可以缓存youtube视频，即使使用不同的网址也能检测到相同的视频？