Pre-fetching next songs

How can I pre-fetch next songs? What I've guessed is that I have to make a GET request to proxy server but still I can't make it work.
I want to be able to cache next song while user is listening to a song so even on slow connections they don't feel a gap.
And thank you for your great repo ;)

Start by inspecting the Android cache API and the proxy server GET-request path mentioned in the issue. Determine whether the repository supports caching a following song while another plays; done would mean the next song is cached in advance and playback avoids a gap on a slow connection.

Written by the indexing model from the issue text.