http://nkuz2tpok7ctwd5ueer5bytj3bm42vp7lgjcsnznal3stotg6vyaakyd.onion/rbm_input_files.html
Each file descriptor is an hash containing some of the following
options: filename The name of the file that will be fetched. Except when an URL
or a project is set, this filename is mandatory. If it is not
set when an URL is set, the basename of the URL is used as a
filename.