This is a 40-line Node server, 30 lines of which are straight copypasta. Thanks to Blaise Roberts for the boilerplate code.
Example Goodreads API call:
https://www.goodreads.com/book/show/50.xml
How to make the same call through the proxy server:
http://mixify-proxy.herokuapp.com/gr/book/show/50.xml
Example Musixmatch API call:
http://api.musixmatch.com/ws/1.1/track.search?q_artist=muse
How to make the same call through the proxy server:
http://mixify-proxy.herokuapp.com/mm/track.search?q_artist=muse