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https://cdn.aliyuncs.com/?Timestamp=2016-07-18T15:51:55Z&Format=XML&AccessKeyId=&Action=RefreshObjectCaches&ObjectPath=cj118.net/weixin/weixin4&ObjectType=File&Version=2014-11-11 我的这个请求不对吗,请大神帮我看一下.每次都返回这个错误The input parameter "Timestamp" that is mandatory for processing this request is not supplied.