Selecting an image asset from data mapping

I have a REST service which returns documents, including the file type. Say the type can ben PDF or XML. I would like to display an image icon showing the file type.

I have uploaded two image assets and named one pdf.png and the other xml.png. I have mapped the service property file-format to the image asset and use the following custom javascript:

return "image/" + value + ".png";

Although this seems to be working OK (when I check the source, the src property of the image is changed to image/pdf.png), the image won't display. It looks the image URL starts with and the html is in

What should I do?
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