The value was "closing", but by the time drain_requests wakes and checks, it's already "closed". The intermediate state is gone.
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print("draining pending requests")
04版 - 一版责编：胡安琪 张帅祯 张宇杰 二版责编：殷新宇 张安宇 何 彪 三版责编：吴 刚 姜 波 程是颉 四版责编：袁振喜 刘静文 余 璇
· 周杰 · 来源：tutorial资讯