release-19.4:Backport!3013

Merged Andrey Vertiprahov requested to merge cherry-pick-41243719 into release-19.4

#1186 (closed) py3: Fix request.body processing

See merge request !3013 (merged)

(cherry picked from commit 41243719)

f54073a2 #1186 (closed) py3: Fix request.body processing

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