问Nodejs - https.request错误: connect ECONNREFUSED

EN

httpsServer.js

var https = require('https');

function httpsRequest() {
    var options = {
        hostname: 'api.stackexchange.com',
        path: '/2.2/answers',
        method: 'GET'
    };

    var req = https.request(options, (res) => {
        res.on('data', function (data) {
            console.dir(data);
        });
        req.end();
    });

    req.on('error', function (e) {
        console.error(e);
    });
}

httpsRequest();

Error:

{ Error: connect ECONNREFUSED xxx.xxx.xxx.xx:443
    at Object.exports._errnoException (util.js:1050:11)
    at exports._exceptionWithHostPort (util.js:1073:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1093:14)
  code: 'ECONNREFUSED',
  errno: 'ECONNREFUSED',
  syscall: 'connect',
  address: 'xxx.xxx.xxx.xx',
  port: 443 }