title: Azure Blob storage, CDN and cache expiring
body: <p>We're using Azure CDN, but we've stumbled upon a problem. Before, content could not be updated. But we added the option for our users to crop their picture, which changes the thumbnails. See, the image is not being created as new, instead we just update the stream of the blob. </p>
  
  <p>There doesn't seem to be any method to clear the cache, update any headers or anything else.</p>
  
  <p>Is the only answer here to make a new blob and delete the old?</p>
  
  <p>Thanks.</p>