eaflet easyprint: how to upload image to server?

i use this plugin to export leaflet map as image demo is here http://rowanwins.github.io/leaflet-easyPrint/

this is source code https://github.com/rowanwins/leaflet-easyPrint

my case is attach leaflet map to my ms word document (located in server side). my apporach is export this map to image and save in client side, then upload it to server

as i know leaflet image is client side generator, so how to upload this image to server without fixing saved path

i use python-django and javascript

please help me thanks you very much !