I have set up a Docker from the provided docker-compose.yml
(wikibase.svc has been substituted by example.org in all instances)

Wikimedia URL: http://example.org:8181/
Query services URL: http://example.org:8282/

Upon querying the service returns a list of entities like http://example.org/entity/Q4
when they should be http://example.org:8181/wiki/Item:Q4

Where should I supply the wikimedia service URL with port?
(Writing example.org:8181 everywhere does not work.)