Seen in Logstash (heavily trimmed):
{
"_index": "logstash-2016.03.22",
"_type": "restbase",
"_source": {
"host": "restbase1006",
"level": "WARNING",
"@timestamp": "2016-03-22T07:47:45.697Z",
"from": "Megabalanus coccopoma",
"to": "Megabalanus_coccopoma",
"levelPath": "warn/normalize/space",
"root_req.method": "get",
"root_req.uri": "/en.wikipedia.org/v1/page/html/Megabalanus%20coccopoma",
"root_req.headers.content-length": "0",
"root_req.headers.user-agent": "cxserver",
"root_req.headers.x-request-class": "internal",}
See also "[Wikitech-l] REST API soon redirecting to canonical URLs".