youtube videoplayback 관련 URL

흐음...

여러개 패킷을 까본건 아니지만 캐시에서 다른걸로 인식하는 이유가 저 망할 cpn 값 때문인 듯..

https://r2---sn-ab02a0nfpgxapox-jwwe7.googlevideo.com/videoplayback?source=youtube&ms=au%2Conr&mt=1552538122& mv=m&id=o-ALgIWMfOrFHHMwZnmn-TneMiQB_DBuam4C3gy0uXrNt3&requiressl=yes&dur=478.244&mm=31%2C26& mn=sn-ab02a0nfpgxapox-jwwe7%2Csn-oguelne7&pl=22&ip=211.237.16.76& sparams=aitags%2Cclen%2Cdur%2Cei%2Cgcr%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&signature =E9FA7DEB837FF2931C1BBDF8A75CC08AA6381D.553ACDD01BBD44D14946BB8D37C5B285DD807580&gcr=kr &ipbits=0&expire=1552559810&lmt=1548316020126515&initcwndbps=728750& aitags=133%2C134%2C135%2C136%2C160%2C242%2C243%2C244%2C247%2C278%2C394%2C395%2C396%2C397& mime=video%2Fmp4&itag=396&key=yt6&gir=yes&clen=16011686&keepalive=yes&txp=5532432&fvip=2& ei=YtqJXMbHJKeGs8IPgp6B4AQ& c=WEB&alr=yes& cpn=zCV8-pls_I8uiHHw& cver=2.20190313& range=0-90603& altitags=395%2C394&rn=1&rbuf=0

https://r2---sn-ab02a0nfpgxapox-jwwe7.googlevideo.com/videoplayback?source=youtube&ms=au%2Conr&mt=1552538122& mv=m&id=o-ALgIWMfOrFHHMwZnmn-TneMiQB_DBuam4C3gy0uXrNt3&requiressl=yes&dur=478.244&mm=31%2C26& mn=sn-ab02a0nfpgxapox-jwwe7%2Csn-oguelne7&pl=22&ip=211.237.16.76& sparams=aitags%2Cclen%2Cdur%2Cei%2Cgcr%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&signature =E9FA7DEB837FF2931C1BBDF8A75CC08AA6381D.553ACDD01BBD44D14946BB8D37C5B285DD807580&gcr=kr &ipbits=0&expire=1552559810&lmt=1548316020126515&initcwndbps=728750& aitags=133%2C134%2C135%2C136%2C160%2C242%2C243%2C244%2C247%2C278%2C394%2C395%2C396%2C397& mime=video%2Fmp4&itag=396&key=yt6&gir=yes&clen=16011686&keepalive=yes&txp=5532432&fvip=2& ei=YtqJXMbHJKeGs8IPgp6B4AQ& c=WEB&alr=yes& cpn=naxiChjHuGyejORl& cver=2.20190313& range=0-90603& altitags=395%2C394&rn=1&rbuf=0

[링크 : https://www.youtube.com/watch?v=lBSC3rUWGtY]

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크롬에서 개발자도구로 검색해보니 base.js 에서 cpn을 생성하는 부분을 발견..

Client Playback Nonce 줄여서 cpn

g.h.Wj = function(a) {         lja(this, a);         if ("html5.invalidstate" != a.errorCode && "fmt.unplayable" != a.errorCode && "fmt.unparseable" != a.errorCode || !WI(this, a.errorCode, a.details)) {             var b = /^pp/.test(this.g.clientPlaybackNonce);             if (kja(a)) {                 a.details.sts = "17968";                 if (YI(this)) {                     g.U(this.l, 4) || !this.fa("html5_suspended_reload_killswitch") && g.U(this.l, 512) ? (this.Mc = !0, cI(this)) : (this.o && (a.g && (a.details.e = a.errorCode, a.errorCode = "qoe.restart", a.g = !1), this.o.onError(a.errorCode, Tw(a.details))), ZI(this));                     return                 }                 a: if (!(6048E5 >                         g.P() - this.A.vh)) {                     try {                         window.location.reload(!0);                         break a                     } catch (c) {}                     this.fa("tvhtml5_retire_old_players") && g.Iy(this.A) && aJ(this)                 }             }             if ($I(a) && this.g.va && this.g.va.i) {                 if (this.o) this.o.onError(a.errorCode, Tw(a.details));                 this.Ya("highrepfallback", "1", !0);                 !this.fa("html5_hr_logging") && /^hr/.test(this.g.clientPlaybackNonce) && btoa && this.Ya("afmts", btoa(this.g.adaptiveFormats));                 zha(this.g);                 aI(this);                 cI(this);                 VI(this);                 this.playVideo()             } else a.g ? (b = this.u ? this.u.B.o : null, b = $I(a) && b && b.isLocked() ? "FORMAT_UNAVALIABLE" :                 void 0, g.lI(this, a.errorCode, b, Tw(a.details))) : this.o && (this.o.onError(a.errorCode, Tw(a.details)), b && "manifest.net.connect" == a.errorCode && (a = "https://www.youtube.com/generate_204?cpn=" + this.g.clientPlaybackNonce + "&t=" + g.P(), (new IF(a, "manifest", (0, g.y)(function(c) {                 this.Ya("pathprobe", c)             }, this), (0, g.y)(function(c) {                 this.onError(c.errorCode, Tw(c.details))             }, this.o))).send()))         }     };