It would be very usefull to get the full url returned for sitelinks.
When querying interwikilinks or langlinks you can add llurl or iwurl, so that the full url is additionally returned as attributes named url.
Example:
http://de.wikipedia.org/w/api.php?action=query&titles=Berlin&prop=langlinks|iwlinks&llurl&iwurl
Thats a very often used query. Always querying the interwikimaps to get the correct target for an prefix doubles the numbers of requests and slow down bots.
Version: unspecified
Severity: enhancement
Whiteboard: storypoints: 3