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    <p>From the code, it seems that you're actually letting the browser do the download. In that scenario, I believe the option is to have shared access signatures valid for longer duration.</p> <p>Yet another idea is to have your code read the chunks of the blob and then transmit those chunks. That way if there's a need you could create a new SAS URI and use that if the SAS URI timeout has expired and the blob has not downloaded completely.</p> <p>Take a look at sample code below. Basically in this sample, I have a 200 MB blob. In loop, my code reads 1 MB chunk of the blob and sends that chunk down.</p> <pre><code> protected void ButtonDownload_Click(object sender, EventArgs e) { var blobUri = "http://127.0.0.1:10000/devstoreaccount1/abc/test2.vhd?sr=b&amp;st=2012-08-17T10%3A29%3A46Z&amp;se=2012-08-17T11%3A29%3A46Z&amp;sp=r&amp;sig=dn7cnFhP1xAPIq0gH6klc4nifqgk7jfOgb0hV5Koi4g%3D"; CloudBlockBlob blockBlob = new CloudBlockBlob(blobUri); var blobSize = 200 * 1024 * 1024; int blockSize = 1024 * 1024; Response.Clear(); Response.ContentType = "APPLICATION/OCTET-STREAM"; System.String disHeader = "Attachment; Filename=\"" + blockBlob.Name + "\""; Response.AppendHeader("Content-Disposition", disHeader); for (long offset = 0; offset &lt; blobSize; offset += blockSize) { using (var blobStream = blockBlob.OpenRead()) { if ((offset + blockSize) &gt; blobSize) blockSize = (int)(blobSize - offset); byte[] buffer = new byte[blockSize]; blobStream.Read(buffer, 0, buffer.Length); Response.BinaryWrite(buffer); Response.Flush(); } } Response.End(); } </code></pre> <p>Hope this helps.</p>
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    1. POAzure download with GetSharedAccessSignature of large file
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    1. USGaurav Mantri
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    1. COWrt the first solution (make the expiration time longer): this is not possible as the maximum duration that can be set is 1 hour. If you set it longer than one hour, you receive the Azure error message "Access without signed identifier cannot have time window more than 1 hour".
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    2. COWith the release of latest REST API, it is possible to have a SAS URL valid for longer than 1 hour (only in Cloud Storage with SDK 1.7.1). You can read more about it here: http://blogs.msdn.com/b/windowsazurestorage/archive/2012/06/12/introducing-table-sas-shared-access-signature-queue-sas-and-update-to-blob-sas.aspx
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    3. COThanks Gaurav, I'm now using the 1.7.1.0 and it appears to be working (however, I was supprised by the breaking changes between 1.7.0.0 and 1.7.1.0 such as "container.CreateIfNotExist();" gives the error "container already exists". Still it's working currently.... I do still have another issue wrt IE9, but I'll post that in a separate question.
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