Interface and client interaction (rest api)?

Question

JavaScript

There is a client and server interface. The logic of the following process is interesting: we press the on button and the client connects to the server. How does this even happen? A request is sent to the client, after processing which he understands that he needs to connect or how? And how is the rest api used?

Answer 1

You can see the requests, it's very easy to do if you have a web application. In the development console, open networking and take a look. Now REST is most often used, but if the system is legacy, then maybe SOAP.