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
Uses API functions in here: https://github.com/emusic-eng/ui/blob/frozen/wp-content/plugins/browse/templatetags.php
And here: https://github.com/emusic-eng/ui/blob/frozen/wp-content/functions-api.php#L255
Main request handler (not decorated like Browse): https://github.com/emusic-eng/ui/blob/frozen/wp-content/requests/search.php
Autocomplete stuff: https://github.com/emusic-eng/ui/blob/frozen/wp-content/plugins/search/search.php
API functions: https://github.com/emusic-eng/ui/blob/frozen/wp-content/plugins/search/templatetags.php#L158
https://github.com/emusic-eng/ui/blob/frozen/wp-content/service-endpoints.php