I have a question using the google.appengine.api.images api. I current generate a URL using images.get_serving_url when I upload an image. I then store the URL in the datastore along with the Blob key. I then just use the URL for displaying all the images. This website has been up for years and just recently many of the URLs are getting 404s. I can re-generate the URLs from the Blob keys. But wondering if there is a usage pattern that I am missing? Do these URLs have a lifetime on them?
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