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100精币
https://vod.cn-shanghai.aliyuncs.com/?AccessKeyId=STS.NUCqxrK8qjv95Bx2iYFVwue6o&Action=GetPlayInfo&AuthInfo={"CI":"8JlAePhzoKtlqlY12Gl0a087al3L6gj5XEyEmVbIKOMNG/881XpDcz05W08wSwjwcz2yIOOPdUI2POG+jIBx7EDHRRBwhq1Xpy2deEZkk04=","Caller":"u88x3vVNVsWDGM5QYg/VrxjHe8DMWkUyeJQ+t+vl7d8=","ExpireTime":"2021-10-15T01:46:28Z","MediaId":"5dc4d7789db4498da622eb7f1cfea312","PlayDomain":"alv.renminyixue.cn","Signature":"PC8cN//34F0gYMIdi71IZdvJJ14="}&AuthTimeout=7200&Channel=HTML5&Definition=&Format=JSON&Formats=m3u8&PlayConfig={}&PlayerVersion=2.8.2&Rand=DPaHi2JmJ22ckHebvIXdiEftl9+a1WjlNAu3/Lkjz65BVuHgXLusUtkqpQccvSx2qotZ5mX6l/BnYZgd1N40Yw==&ReAuthInfo={}&SecurityToken=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&SignatureMethod=HMAC-SHA1&SignatureNonce=9c59b453-5b13-48ce-8d53-981cda3e321b&SignatureVersion=1.0&StreamType=video&Version=2017-03-21&VideoId=5dc4d7789db4498da622eb7f1cfea312&Signature=BvdICEyHTVHDFrBknK8vsxI2uzs=
后面这个签名是怎么签的,或者说是要签名的内容是哪些
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