HTTP Request from Web to Android

How can I make an HTTP request from a web application (like node js) to an android app?

The goal is to read if the response is a success, for example, from Web to Web I make an HTTP request to the IP/URL and, if it returns 200, I have success. It would work as a "ping" to check if the android app is "alive".

Note: I don't know apps architecture

Thanks!