1，后台报错信息是这样的

[HPM] Error occurred while trying to proxy request  from localhost:8081 to https://api.github.com/user (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

尝试全局搜索 Error occurred while trying to proxy request
搜索结果是这样的

./node_modules/http-proxy-middleware/lib/index.js:
'[HPM] Error occurred while trying to proxy request %s from %s to %s (%s) (%s)'

查看./node_modules/http-proxy-middleware/lib/index.js
是这么写的

function logError(err, req, res) {
    var hostname =
      (req.headers && req.headers.host) || (req.hostname || req.host) // (websocket) || (node0.10 || node 4/5)
    var target = proxyOptions.target.host || proxyOptions.target
    var errorMessage =
      '[HPM] Error occurred while trying to proxy request %s from %s to %s (%s) (%s)'
    var errReference =
      'https://nodejs.org/api/errors.html#errors_common_system_errors' // link to Node Common Systems Errors page

    logger.error(
      errorMessage,
      req.url,
      hostname,
      target,
      err.code || err,
      errReference
    )
  }

后台打印的是封装好的信息，但是第一个参数err是啥呢
打印一下

Error: connect ECONNREFUSED 13.250.168.23:443
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1141:16) {
  errno: -61,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '13.250.168.23',
  port: 443
}

connect ECONNREFUSED 13.250.168.23:443
连接被拒绝了
好吧 最后搜了很多关于 connect ECONNREFUSED 13.250.168.23:443 的报错解决办法
搜到了下面的一段话

国内服务器访问 github 时常报错 connect ECONNREFUSED 13.250.168.23:443 这是个网络问题， github 的接口都是有限流的

呵呵呵