Main browse request handler: https://github.com/emusic-eng/ui/blob/frozen/wp-content/requests/browse.php
Extends: https://github.com/emusic-eng/ui/blob/frozen/wp-content/mu-plugins/class-request-map.php
And gets decorated by: https://github.com/emusic-eng/ui/blob/frozen/wp-content/requests/lucene-map.php