Merge remote-tracking branch 'alibaba/master' into dynamic_upstream_check
Merge remote-tracking branch 'yaoweibin/dynamic_upstream_check' into dynamic_upstream_check
Merge remote-tracking branch 'yaoweibin/dynamic_upstream_check' into dynamic_upstream_check
Fixed: array_push caused upstream'repeat
release repeat upstream's pool
Merge pull request #3 from yzprofile/dynamic_upstream_check

Dynamic upstream check