simplify header and event handling#2

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mengzhuo wants to merge 9 commits intobsphere:masterfrom

mengzhuo:master

Commits on Jun 24, 2015

Commits on Jun 25, 2015

fix typo
mengzhuo
committed

Commits on Jun 26, 2015

remove state with open boolean
mengzhuo
committed

Commits on Jun 29, 2015

Commits on Jul 24, 2015

OK count as heartbeat
mengzhuo
committed

Commits on Sep 7, 2015