To retrieve the binary data from an attribute such as
blob, the actual URL of the binary needs to be determined first. For this, extract the blob’s
id, unescape and URL-encode it, then use it for querying the URL.
Transformed images are delivered with a best effort approach. It is not guaranteed that the delivered transformation exactly matches the requested dimensions. The images are probably larger and need to be scaled down by the client as long as the transformation request does not exceed the image size limit. The size of the transformed image is limited to an aspect-ratio-retaining size fitting into 8192 by 8192 pixels.
For restricted blobs, no private URL but an inaccessible public URL is returned if the user does not have access to the object referencing the blob.