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Premise: the primary sources tool back end is being implemented as a Wikidata query service module.
After some digging, I found that the Wikidata query service uses an old version (4.4) of the Apache HTTP client, which made the primary sources tool hit this bug:
https://issues.apache.org/jira/browse/HTTPCLIENT-1609
The nginx upstream and keepalive directives are a workaround for the bug.
Version 4.4.1 fixed the bug:
https://archive.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.4.x.txt
Upgrading to 4.4.1 seems to have resolved the issue.
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Cc: bd808, Aklapper, Hjfocs, 1978Gage2001, Lahi, aborrero, Gq86, GoranSMilovanovic, Kiailandi, Chicocvenancio, QZanden, Tbscho, dachary, LawExplorer, JJMC89, Luke081515, Wikidata-bugs, aude, Gryllida, Ricordisamoa, Sjoerddebruin, Tpt, scfc, Mbch331, Krenair, chasemp
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