valhallasw added a subscriber: valhallasw. valhallasw added a comment.
The easiest way to force an invalid cert error is by passing an empty cert bundle (which would make every site show up as having an invalid certificate).
TASK DETAIL https://phabricator.wikimedia.org/T101138
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To: valhallasw Cc: valhallasw, Aklapper, XZise, jayvdb, pywikipedia-bugs