Configuring HTTPS for Express and Nginx

I am trying to configure my ExpressJS app for https connection. The Express server runs at localhost:8080 and the secure one localhost:8443.

Here is the server.js code related to https:

var app = express();

var https = require('https');

const options = {
    cert: fs.readFileSync('/etc/letsencrypt/live/fire.mydomain.me/fullchain.pem'),
    key: fs.readFileSync('/etc/letsencrypt/live/fire.mydomain.me/privkey.pem')
};

app.listen(8080, console.log("Server running"));
https.createServer(options, app).listen(8443, console.log("Secure server running on port 8443"));

And here is my Nginx configuration:

server {
    listen 80;
    listen [::]:80;
    server_name fire.mydomain.me;

    location / {
        proxy_pass http://localhost:8080;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

server {
    listen 443;
    listen [::]:443;
    server_name fire.mydomain.me;
    location / {
        proxy_pass https://localhost:8443;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

What I did :

• Generating SSL certificate with Letsencrypt certonly tool for the domain fire.mydomain.me.
• Configuring nginx.
• Configuring the server.js node app.
• Adding TCP rules for the 443 port in Ufw.

I tried

• Commenting the not-ssl server line in server.js to force the connections to go through ssl configuration: this serve the page when I try to go to fire.mydomain.me:443 but not to "https:// fire.mydomain.me". In both cases, no SSL. Trying to go to https:// fire.mydomain.me generate this message "This website doensn't provide a secure connection" in Google Chrome.

• I followed this tutorial in the first place to set my ssl node config : https://medium.com/@yash.kulshrestha/using-lets-encrypt-with-express-e069c7abe625#.93jgjlgsc

via Guillaume