Copy storage blob from http

StorageBlobFunction.cs

using System;
using System.Threading.Tasks;
using Microsoft.Azure.WebJobs;
using Microsoft.Extensions.Logging;
using Microsoft.Azure.Storage;
using Microsoft.Azure.Storage.Blob;
using System.Net;
using System.Linq;

namespace azurefunction
{
    public class StorageBlobFunction
    {
        /// <summary>
        /// The delay task if pending
        /// </summary>
        private const int DELAY_OF_TASK = 1000;

        /// <summary>
        /// Download blob image from storage 
        /// </summary>
        /// <param name="myTimer">The TimerInfo.</param>
        /// <param name="log">The log.</param>
        /// <returns></returns>
        [FunctionName("storage-blob-copy")]
        public async Task DownloadBlobAsync(
            [TimerTrigger("0 00 22 * * *")] TimerInfo myTimer, ILogger log)
        {
            //destination container
            string destConnectionString = "DestConnectionString";
            string destContainerName = "DestContainerName";

            // create the blob client for the destination storage account
            CloudStorageAccount destStorageAccount = CloudStorageAccount.Parse(destConnectionString);
            CloudBlobClient destClient = destStorageAccount.CreateCloudBlobClient();
            var destContainer = destClient.GetContainerReference(destContainerName);
            await destContainer.CreateIfNotExistsAsync().ConfigureAwait(false);

            var blobUrls = new string[]
            {
                "http://sourceContainer/blob1.jpg",
                "http://sourceContainer/blob2.png"
            };

            try
            {
                foreach (var url in blobUrls)
                {
                    var contentMd5 = "";
                    using (WebClient client = new WebClient())
                    {
                        client.OpenRead(url);
                        contentMd5 = client.ResponseHeaders.Get("Content-MD5"); // use to check if blob modified
                    }

                    var fileName = url.Split("/").Last();

                    // copy to the blob
                    CloudBlob destBlob = destContainer.GetBlobReference(fileName);
                    await destBlob.StartCopyAsync(new Uri(url)).ConfigureAwait(false);
                    while (destBlob.CopyState.Status == CopyStatus.Pending)
                    {
                        await Task.Delay(DELAY_OF_TASK).ConfigureAwait(false);
                        await destBlob.FetchAttributesAsync().ConfigureAwait(false);
                        destBlob = destContainer.GetBlockBlobReference(destBlob.Name);
                    }

                    if (destBlob.CopyState.Status == CopyStatus.Success)
                    {
                        //do something
                    }
                }
            }
            catch (StorageException e)
            {
                log.LogError($"HTTP error code {e.RequestInformation.HttpStatusCode} : {e.RequestInformation.ErrorCode}");
            }
        }
    }
}