/// <summary>
        /// Generates a web request to copy from a blob or file to another file.
        /// </summary>
        /// <param name="uri">A <see cref="System.Uri"/> specifying the absolute URI to the destination file.</param>
        /// <param name="timeout">An integer specifying the server timeout interval.</param>
        /// <param name="source">A <see cref="System.Uri"/> specifying the absolute URI to the source object, including any necessary authentication parameters.</param>
        /// <param name="sourceAccessCondition">An <see cref="AccessCondition"/> object that represents the condition that must be met on the source object in order for the request to proceed.</param>
        /// <param name="destAccessCondition">An <see cref="AccessCondition"/> object that represents the condition that must be met on the destination file in order for the request to proceed.</param>
        /// <param name="useVersionHeader">A boolean value indicating whether to set the <i>x-ms-version</i> HTTP header.</param>
        /// <param name="operationContext">An <see cref="OperationContext"/> object that represents the context for the current operation.</param>
        /// <returns>A <see cref="System.Net.HttpWebRequest"/> object.</returns>
        public static HttpWebRequest CopyFrom(Uri uri, int?timeout, Uri source, AccessCondition sourceAccessCondition, AccessCondition destAccessCondition, bool useVersionHeader, OperationContext operationContext)
        {
            CommonUtility.AssertNotNull("source", source);

            HttpWebRequest request = HttpWebRequestFactory.CreateWebRequest(WebRequestMethods.Http.Put, uri, timeout, null /* builder */, useVersionHeader, operationContext);

            request.Headers.Add(Constants.HeaderConstants.CopySourceHeader, source.AbsoluteUri);
            request.ApplyAccessCondition(destAccessCondition);
            request.ApplyAccessConditionToSource(sourceAccessCondition);

            return(request);
        }
        /// <summary>
        /// Generates a web request to copy a blob.
        /// </summary>
        /// <param name="uri">The absolute URI to the destination blob.</param>
        /// <param name="timeout">The server timeout interval.</param>
        /// <param name="source">The absolute URI to the source blob, including any necessary authentication parameters.</param>
        /// <param name="sourceAccessCondition">The access condition to apply to the source blob.</param>
        /// <param name="destAccessCondition">The access condition to apply to the destination blob.</param>
        /// <param name="operationContext">An <see cref="OperationContext"/> object for tracking the current operation.</param>
        /// <returns>A web request to use to perform the operation.</returns>
        public static HttpWebRequest CopyFrom(Uri uri, int?timeout, Uri source, AccessCondition sourceAccessCondition, AccessCondition destAccessCondition, OperationContext operationContext)
        {
            HttpWebRequest request = HttpWebRequestFactory.CreateWebRequest(WebRequestMethods.Http.Put, uri, timeout, null /* builder */, operationContext);

            request.ContentLength = 0;

            request.Headers.Add(Constants.HeaderConstants.CopySourceHeader, source.AbsoluteUri);
            request.ApplyAccessCondition(destAccessCondition);
            request.ApplyAccessConditionToSource(sourceAccessCondition);

            return(request);
        }