title: AWS s3 cp command returns: An error occurred (InvalidRequest) when calling the ListObjects operation
body: <p>I've got a user with permission with the <code>AmazonS3FullAccess</code> policy, my bucketname is <code>abcxyzchristest</code>.</p>
  
  <p>I've configured the AWS cli with the above user.</p>
  
  <p>When running <code>aws s3 cp --region eu s3://abcxyzchristest/ abcxyz</code> I get:</p>
  
  <pre><code>fatal error: An error occurred (InvalidRequest) when calling the ListObjects operation: Missing required header for this request: x-amz-content-sha256
  </code></pre>
  
  <p>What is the cause of the error?</p>