Gets and sets the CallerReference property.
            A unique number that ensures the request can't be replayed.
            If the CallerReference is new (no matter the content of the CloudFrontDistributionConfig object),
            a new distribution is created.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public virtual string CallerReference { get; set; }
 Remarks
 RemarksIf the CallerReference is a value you already sent in a previous request to create a distribution, and the content of the CloudFrontDistributionConfig is identical to the original request (ignoring white space), the response includes the same information returned to the original request.
If the CallerReference is a value you already sent in a previous request to create a distribution but the content of the CloudFrontDistributionConfig is different from the original request, CloudFront returns a DistributionAlreadyExists error.