On vagrant, on http://dev.wiki.local.wmftest.net:8080/api/rest_v1/#!/Citation/getCitation page, the sample request queries the following url:
Which is of course wrong.
Slightly more worrying is that it doesn't seem to be able to complete the request when the search param is an encoded uri. So for instance,
http://dev.wiki.local.wmftest.net:8080/api/rest_v1/data/citation/mediawiki/www.example.com
works, but
returns
{"type":"https://mediawiki.org/wiki/HyperSwitch/errors/not_found#route","title":"Not found.","method":"get","uri":"/dev.wiki.local.wmftest.net/v1/data/citation/mediawiki/http%3A//www.example.com"}
(This query works in production, i.e. https://en.wikipedia.beta.wmflabs.org/api/rest_v1/data/citation/mediawiki/http%3A%2F%2Fwww.example.com)