Thread: Hello, I have a spring boot server, but it only works on the local host, how can I make it work similarly to p2p without raising the server

Hello, I am a noob in the field of networks, tell me how can I make it so that two applications (a server on a spring booth) can connect to each other if I have
access to both devices, but the connection must be via the Internet, I know that most cryptocurrencies work similarly to p2p, I have a discovery, an application -
a server that will store ip addresses, but I don’t know how to write code in java so that both servers can connect to each other, I heard a little about turn, I have an application
works on REST api, I know a little about sockets. Can you show step by step how to implement it.
if I run these applications twice on different ports, on the same device, everything works, but how do I make a connection, on
different devices over the Internet? what ip should i take and from where? I heard about the white ip, but whoever runs it on their PC, give me a simple code.
example of my code:

To connect two Spring Boot applications over the internet, you can use one of the following methods:

1. REST API

This is the simplest way to connect two applications. You can create a REST API in one application and expose it to the internet. The other application can then consume the REST API to communicate with the first application.

To do this, you will need to:

Create a Spring Boot application that exposes a REST API.
Deploy the application to a server that is accessible over the internet.
In the other Spring Boot application, create a REST client to consume the REST API of the first application.
Use the REST client to make requests to the REST API of the first application.