[Zope] ZPublisher only solution ?

I worte an external method ReadFile (open, read ,close) to insert a file to Zope (with :result=context.ReadFile(filepath) container.manage_addProduct['OFSP'].manage_addFile(fileid,file=result,content_type='application/pdf')) My problem is now if I insert an URL (because my file will be created dynamically) instead of an path it does not work ... want can I do ?