lsof -i:8888 發現端口未被占用
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被當作代理占用了，需要關閉。
解決：在終端輸入以下命令
export http_proxy=''
export https_proxy=''免責聲明！
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