release-19.4:Backport!3041

Merged Andrey Vertiprahov requested to merge cherry-pick-0b083db2 into release-19.4

#1201 (closed) py3: Fix http client eof_mark handling

See merge request !3041 (merged)

(cherry picked from commit 0b083db2)

15811bab #1201 (closed) py3: Fix http client eof_mark handling 5946b8b8 Convert eof_mark to bytes

Edited by Andrey Vertiprahov

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