完整的报错信息如下：
{ Error: socket hang up
at createHangUpError (_http_client.js:330:15)
at Socket.socketOnEnd (_http_client.js:423:23)
at Socket.emit (events.js:164:20)
at endReadableNT (_stream_readable.js:1062:12)
at process._tickCallback (internal/process/next_tick.js:152:19) code: 'ECONNRESET' }
(node:29975) UnhandledPromiseRejectionWarning: Error: socket hang up
at createHangUpError (_http_client.js:330:15)
at Socket.socketOnEnd (_http_client.js:423:23)
at Socket.emit (events.js:164:20)
at endReadableNT (_stream_readable.js:1062:12)
at process._tickCallback (internal/process/next_tick.js:152:19)
(node:29975) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:29975) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.