Web applications implemented in two languages

You want to implement one dynamic web application using two languages: jsp, node.js (express). It's a site with community functions such as login and bulletin board.

As a result of googling with the questions I posted before, I heard that you can implement a single web application by changing the port using Apache's proxy.

If you're done setting up Apache proxy, When the main page is implemented as node.js (express) and the membership part is implemented as jsp, can I move right away when I click the membership button on the main page?

I still have little knowledge about the server, so the questions are vague.ㅜ <

Then, the hosting server, not the local server? When I implemented and created a virtual server that can be accessed from other computers, the database is also implemented on the virtual server, so I think I can access the same mysql from the membership or main page, so I would like to ask if it is possible to access it~