HH-45022 override check_xsrf_cookie method of PageHandler
HH-45117 tornado3-compatible send_error
Merge remote-tracking branch 'origin/HH-45022' into EXP-11855
release 2.20.16 [a.inozemtsev@hh.ru]
Merge remote-tracking branch 'origin/HH-45117' into EXP-11891
release 2.20.17 [an.sumin@hh.ru]
HH-45117 fix HTTPError in prepare method
Merge remote-tracking branch 'origin/HH-45117' into EXP-11891
release 2.20.18 [an.sumin@hh.ru]
temp