Node.js https does not work in Cloud9

I can create an http server and it works fine, but as soon as I try to use https instead, the server runs without errors but I cannot connect to it at all.

HTTP (working):

http.createServer(app).listen(process.env.PORT, process.env.IP);

HTTPS (not working):

var options = {  key: fs.readFileSync('server.key'),  cert: fs.readFileSync('server.crt')};https.createServer(options, app).listen(process.env.PORT, process.env.IP);

There are no errors in either method, but when I use HTTPS, there is no response when visiting the webpage and the server acts like it's not even receiving a request. Is there something wrong with the port I'm using from the Cloud9 environment? I have tried for hours to figure out what the problem is but haven't made any progress, hopefully someone can help out.