lsof -i:8888 发现端口未被占用
查看代理：env|grep -i proxy
https_proxy=127.0.0.1:8888
http_proxy=127.0.0.1:8888
socks_proxy= ftp_proxy=
原因是127.0.0.1 port 8888被当作代理占用了，需要关闭。
解决：在终端输入以下命令
export http_proxy=''
export https_proxy=''免责声明！
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