| Lucas_Werkmeister_WMDE added a comment. |
The only live polling feature I can think of that was recently introduced is for the live updates to Special:RecentChanges.
As far as I know, that feature just reloads the recent changes every few seconds with a new request.
Another thing that might be similar: for certain queries, the Wikidata Query Service can push out lots of results for up to sixty seconds (at which point the query is killed by timeout) or even longer (if the server returned results faster than they could be transferred – it seems the timeout only applies to the query itself). The simplest such query would be SELECT * WHERE { ?s ?p ?o. }; when I just tried it out (curl -d 'query=SELECT * WHERE { ?s ?p ?o. }' https://query.wikidata.org/sparql -o /dev/null), I received 1468M in 5 minutes (at which point I killed curl – I have no idea how much longer it would have continued to receive results). However, if I understand it correctly, WDQS’ proxy seems to be running in do_stream mode, since I’m receiving results immediately and continuously.
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