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Editorial Team
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Asked: 2026-05-16T07:56:30+00:00

I have a general purpose file storage backed by Google App Engine Blobstore, when

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I have a general purpose file storage backed by Google App Engine Blobstore, when I show users it’s contents I would like to differentiate images from other files — I would like to show thumbnail for each image.

Python get_serving_url function does not care (at least at dev server) if given blob is in fact an image, java’s getServingUrl throws en exception…

So my question, is: How to detect in python if a blob store entry is an image, so I could get a serving_url and use it in the UI?

EDIT:

On production python is throwing NotImageError on get_serving_url call with not supported blob—it’s just not documented and it does not do that on dev server.

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1 Answer

  1. Editorial Team

    You could putting the call inside a try…except block, catching the exception which is thrown when the object is found to not be an image.

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