Apache reverse proxy configuration for Node.js with Let's Encrypt SSL/TLS certificate.

enable-apache-nodejs-reverse-proxy.sh

a2ensite subdomain.me.com.conf
a2ensite subdomain.me.com.ssl.conf
service apache2 reload

explain.txt

Node.js app listens on 8080 for HTTP. It doesn't need to listen for HTTPS.

In firewall, allow port 8080 only on localhost interface.

Let's encrypt certificate is created for subdomain.me.com and stored in /home/USER/letsencrypt/etc/live/subdomain.me.com

subdomain.me.com.conf

# /etc/apache2/sites-available/subdomain.me.com.conf
<VirtualHost *:80>
        ServerName subdomain.me.com

        <Location "/">
                ProxyPreserveHost On
                ProxyPass http://localhost:8080/
                ProxyPassReverse http://localhost:8080/
        </Location>
        
        # If you want to redirect HTTP to HTTPS, remove <Location> above and add Redirect:
        # Redirect permanent / https://subdomain.me.com/
</VirtualHost>

subdomain.me.com.ssl.conf

# /etc/apache2/sites-available/subdomain.me.com.ssl.conf
<VirtualHost *:443>
        ServerName subdomain.me.com

        SSLEngine on
        SSLCertificateFile /home/USER/letsencrypt/etc/live/subdomain.me.com/fullchain.pem
        SSLCertificateKeyFile /home/USER/letsencrypt/etc/live/subdomain.me.com/privkey.pem

        <Location "/">
                ProxyPreserveHost On
                ProxyPass http://localhost:8080/
                ProxyPassReverse http://localhost:8080/
        </Location>
</VirtualHost>

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