Example download file url is:
http://elibsrv-demo.viste-family.net/srv/www/elibsrv-demo.viste-family.net/getfile/3022351156/Bram Stoker - Dracula (en).epub
Seems like your url-building is taking the whole filesystem path over there. Probably not terribly secure to hand people any kind of data about your computer, also it seems wasteful.
But nitpicky details aside, this project looks good!