我在c++程序中调用AWS SDK for C++ with Version:1.11.577    
我已经设置了签名          
>  Aws::S3::S3ClientConfiguration config;    
>  config.payloadSigningPolicy = Aws::Client::AWSAuthV4Signer::PayloadSigningPolicy::Always;    
>  Aws::S3::S3Client s3_client(config);    
>  s3_client.PutObject(request);    

为什么在日志却输出 
>  Note: Http payloads are not being signed. signPayloads=1 http scheme=http    
>  x-amz-content-sha256:STREAMING-UNSIGNED-PAYLOAD-TRAILER    

我应该如何正确设置负载签名，使x-amz-content-sha256头的值为STREAMING-AWS4-HMAC-SHA256-PAYLOAD

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payload sign的方法