16:40:31 seq:31 work:30 code:503 cost:36.0 msg:Get "http://127.0.0.1:8881/ping": dial tcp 127.0.0.1:8881: connectex: Only one usage of each socket address (protocol/network address/port) is normally permitted.

16:40:31 seq:18 work:41 code:503 cost:24.0 msg:Get "http://127.0.0.1:8881/ping": dial tcp 127.0.0.1:8881: connectex: Only one usage of each socket address (protocol/network address/port) is normally permitted.

16:40:31 seq:54 work:56 code:503 cost:8.0 msg:Get "http://127.0.0.1:8881/ping": dial tcp 127.0.0.1:8881: connectex: Only one usage of each socket address (protocol/network address/port) is normally permitted.

16:40:31 seq:119 work:40 code:503 cost:327.0 msg:Get "http://127.0.0.1:8881/ping": dial tcp 127.0.0.1:8881: connectex: Only one usage of each socket address (protocol/network address/port) is normally permitted.

开始正常，然后过会就卡住了，然后日志都是503
接口没有限制连接数