Without this, the underlying requests session can persist after _forget(), which is typically used after a fork. It is not sane to recycle that connection in such situations.
See also: #860
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rebased onto 024782eacce1351cee8ba6c47a3e24a63bd6cd3e
Commit f9d3a73e fixes this pull-request
Pull-Request has been merged by mikem
Without this, the underlying requests session can persist after _forget(), which is typically used after a fork. It is not sane to recycle that connection in such situations.