Configure HTTPS on NodeJS for Watson Conversation - node.js

Question

This is the code that was provided in the example:
'use strict';
var server = require('./app');
var port = process.env.PORT || process.env.VCAP_APP_PORT || 3000;
server.listen(port, function() {
console.log('Server running on port: %d', port);
});
But when using https instead of server it is not working well with IBM Watson conversation code.
The below is the code I used:
var https = require('https');
var fs = require('fs');
var server = require('./app');
var port = process.env.PORT || process.env.VCAP_APP_PORT || 3000;
var options = {
key: fs.readFileSync('key.pem'),
cert: fs.readFileSync('cert.pem')
};
var a = https.createServer(options, function (req, res) {
server.listen(port, function() {
console.log('Server running on port: %d', port);
});
}).listen(port);

Answer 1

In the case, Express API doc spells this out pretty clearly.
And this article can help too.
You can create a HTTPS in node.js with:
var express = require('express'); //express for it
var server = require('./app');
var https = require('https');
var http = require('http');
var fs = require('fs');
var port = process.env.PORT || process.env.VCAP_APP_PORT || 443; //example
// from the Node.js HTTPS documentation, almost the same your code.
var options = {
key: fs.readFileSync('test/fixtures/keys/agent2-key.pem'),
cert: fs.readFileSync('test/fixtures/keys/agent2-cert.cert')
};
// Create a service (the app object is just a callback).
var app = express();
// Create an HTTP service.
http.createServer(app).listen(80); //you can put the port too.
// Create an HTTPS service identical to the HTTP service.
https.createServer(options, app).listen(port);
The Express documentation show this: