Spring Boot SSL behind Apache2 server - apache

Question

I have a Spring Boot Application that has been set up with SSL handling. I was using iptables rerouting to route all port 80 traffic to the spring boot port 8080 and all 443 traffic to spring boot 8443.
Spring Boot was then redirecting any http traffic to https (443). Everything was working fine.
Now I want to run an Apache2 server and use it to redirect the traffic to Spring Boot instead of using straight up iptables rerouting.
I've creating the following conf file for the site:
<VirtualHost *:80>
ServerAdmin mail#gmail.com
ProxyPreserveHost On
ProxyRequests Off
ProxyPass / http://localhost:8080/
ProxyPassReverse / http://localhost:8080/
ErrorLog ${APACHE_LOG_DIR}/site/error.log
CustomLog ${APACHE_LOG_DIR}/site/access.log combined
</VirtualHost>
<VirtualHost _default_:443>
ServerAdmin mail#gmail.com
ProxyPreserveHost On
ProxyRequests Off
ProxyPass / https://localhost:8443/
ProxyPassReverse / https://localhost:8443/
ErrorLog ${APACHE_LOG_DIR}/site/error.log
CustomLog ${APACHE_LOG_DIR}/site/access.log combined
</VirtualHost>
But it doesn't seem to be working. I get "This site can’t provide a secure connection". Although redirection from http to https (set up in spring boot) does seem to be working.
Most of the things I found on google show how to configure spring boot behind Apache2, with Apache2 handling ssl. How do I set it up so that it's spring boot that handles the ssl, and Apache just basically does the port mapping. Or would it be less pain to set up Apache to handle ssl?

Answer 1

Looks like what I want is "Pass through SSL proxying" which Apache2 doesn't support.
From looking around Nginx does support something like this: https://serversforhackers.com/c/tcp-load-balancing-with-nginx-ssl-pass-thru
But even then there are extra complications because this makes it difficult for the server to figure out which host the request is being sent to, as it can't decrypt the encrypted requests
The point of setting up a web server in front of Spring Boot, was to host multiple sites on this server, so I think I'll just set up Apache2 to termnate SSL.