vue.js - How to change the name of downloading file in Vue? -

i have on server files different characters istead of names. looks lkjhaklsjdhfklajs.txt.
, want change name of file. in vuejs next:

<a       :href="main.file"       :download="main.user.name + ' - ' + main.title"     >Скачать     </a> 

the document downloading, name not changing (there name of file on server). how solve problem?
p.s. vue 2