Displaying a PDF from the Blobstore

Question

I have various PDF documents as blobs in the App Engine blobstore. Now, I want to preview them on a HTML page. From various other questions, I figured the HTML setup should be:

<embed src="{{ url_to_my_pdf_blob }}" width="500" height="600">

While experimenting, I found that in the SDK the get_serving_url function will not only work for images but will also work for PDF blobs. This approach unfortunately fails in production.

I looked at the example using blobstore_handlers.BlobstoreDownloadHandler but could not figure out how to wire this to my view (my app is based on Django, the HTML file with the preview is served by a Django view class).

How do I get the url of the blob?

Answer 1

You need to define a ServeHandler, as described here:

https://developers.google.com/appengine/docs/python/blobstore/#Python_Serving_a_blob

For examples of the implementation, see Downloaded filename with Google App Engine Blobstore.