AWS PHP SDK GetObject命令错误

We use some script on PHP which get object from S3 and process it. I get object from S3 with next code:

$command = $this->s3Client->getCommand(
    'GetObject',
    [
        'Bucket'                  => $backetName,
        'Key'                     => $objectKey,
        'ResponseContentEncoding' => 'identity'
    ]
);
return $this->s3Client->execute($command)->toArray(); 

Today I found that this script returns error:

"Error executing \"GetObject\" on \"https://s3.amazonaws.com/backet-name/object-key?response-content-encoding=identity\"; AWS HTTP error: cURL error 61: Unrecognized or bad HTTP Content or Transfer-Encoding".
This script has worked fine some months before.

I tried use another ResponseContentEncoding and finally remove this option, but result was same. Can someone help me to resolve this problem?