Zimlet how to get attachment out of zimbra

[extensys]

Hi to all,
we are working to get a zimlet to do DND and get the content of email's attachments out of zimbra to be stored in a document managemt software ( like knowledge tree ) writte by our own in python (web.py).
So we do the zimlet with DND, we have the email+attachs in an object but we neet do pass it to the python server.
We don't know ho to get the files from the object and pass them to the other one.
we found the URL of the attachs.
Could someone help us ? how JS could pass the attachs out of zimbra?
Thanks.
Alessandro