Issue about connecting with AWS API

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Dear,   when I use Call Rest to connection with AWS API. I get an Message: Forbidden. But in AWS I also can’t find this POST request. Following is the Microflow: Is there any wrong setting in my SigV4Builder or SigV4Parameter or Call Rest Header?  
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1 answers
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Maybe this is the reason. our host is located in XXXXXXX.execute-api.cn-northwest-1.amazonaws.com.cn. But the host which is generated by Get SigV4 Headers is XXXXXXX.execute-api.cn-northwest-1.amazonaws.com. 
I also update this host in Rest Call, but this is useless. Because the Authorization is generated with amazonaws.com, not amazonawsaws.com.cn. 

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