So, i've played a bit and tested some things.
Before serving the blobkey i now set the header of the respond this
way:
res.setHeader("Content-Length", Long.toString(blobInfo.getSize() ));
res.setHeader("Content-Size", Long.toString(blobInfo.getSize() ));
Setting the header works, the respond says:
HTTP/1.1 200 OK
Content-Size: 66882
Content-Type: application/pdf
Date: Mon, 25 Oct 2010 08:10:15 GMT
Server: Google Frontend
Content-Length: 66882
Connection: close
But, all my browsers (I've testest with Safari, Firefox and Chrome)
still are not able to determine the filesize when downloading...
Do you have any idea what else i can try?
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