用于拼接的字符串
GETcvm.api.qcloud.com/v2/index.php?Action=GetUserAccessToken&Nonce=55615&SecretId=AKID52lEROTYltthFZJT2Mf1DAuPhhW3IWO4&Timestamp=1578626010&userAuthCode=3ed75a5f332908dcfcc3612268bcbbd5
生成的签名
bqAWuL+YT6ROO9TUvUiKk+N9M3E=
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