偶现 Error: connect ETIMEDOUT，导致进程退出

[lincong1987]

这个问题出现的概率不大，但出现必然导致进程退出。 logs:

2018-12-22 16:37:03.690 { Error: connect ETIMEDOUT 223.166.152.108:80
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1113:14)
  errno: 'ETIMEDOUT',
  code: 'ETIMEDOUT',
  syscall: 'connect',
  address: '223.166.152.108',
  port: 80 }

Error: connect ETIMEDOUT 223.166.152.108:80
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1113:14)

2018-12-22 16:37:03.744 PID:16356 npm 1 exit!

[zzc-tongji]

是的，使用 file-box 提取文件时尤其如此，详见 #124 。