jayvdb added a comment.
fwiw, badtoken moved from ApiDelete to ApiBase in v1.12 https://phabricator.wikimedia.org/rMW70b5fdd2c91326c29e1664cfa918e1552683155... , and the keyword to search the source is 'sessionfailure' . The checking of tokens moved to ApiMain in 1.24 https://phabricator.wikimedia.org/rMWfdddf94570efc33fd06f16c72d41636a45cf203... .
TASK DETAIL https://phabricator.wikimedia.org/T61678
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