AzureReader2 not working with querystring


I have images in private blockblobs in Azure.

I am using Azure Reader 2 and can access the image like this <a href="http://localhost:55328/azure/00001/IMG_0001.JPG" rel="nofollow">http://localhost:55328/azure/00001/IMG_0001.JPG</a> - it works fine and redirects to the blob with a Shared Access Signature.

However, if I try to resize the image, e.g. IMG_0001.JPG?width=100&height=100, I just get a 404.

Stepping through the code, I notice this line

if (e.VirtualPath.StartsWith(prefix, StringComparison.OrdinalIgnoreCase) && e.QueryString.Count == 0) { .... }

So, if there's a QueryString, no processing happens.

Debug output here: <a href="https://gist.github.com/anonymous/28fd112eec194181baae" rel="nofollow">https://gist.github.com/anonymous/28fd112eec194181baae</a>

Thanks in advance


Your debugging misled you. It's true that redirection only happens when there is no querystring. When there <em>are</em> parameters, the blob needs to be modified, which means we <em>must</em> proxy it. A 302 redirect in that scenario is impossible.

AzureReader registers a IVirtualImageProvider, which ImageResizer automatically uses when handling all the proxying, processing, and caching.

<strong>The default behavior is to download, modify, and re-serve the data. The 302 redirect is just an optimization for throughput on unmodified files.</strong>


sharedAccessExpiryTime is ignored, there is no setting by that name.

If you are going to reference code, it's best to <a href="https://github.com/imazen/resizer/blob/d66072a13d61421d357a66d0d349b84be9b1c804/Plugins/AzureReader2/AzureReader.cs#L106" rel="nofollow">link to the line in the file on github</a>, otherwise we can't easily find the context. Press y on any github page to get a permalink, then click a line number (or range).


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