How to receive http request on my local machine from the remote device on the internet?-CodePudding

I am developing an app to learn serverside. I have created a node js server and an android app.

WorkFlow⚙️(What I want to achieve):-

My local IP of pc: 192.168.0.120

On the port I am listening:8443

The whole thing working fine in localhost: as I am sending POST req. on 192.168.0.120:8443 on clicking the button on my app.

But this will only work if I am connected to my wifi not when connected to the SIM network or somewhere remote location.

So my question is where to send a request by clicking the button in my app (definitely can't send on 192.168.0.120:8443 as I am won't be connected to wifi)?

server.js file

    let http = require('http')
    
    let server = http.createServer(function (req, res) {
        if (req.method === 'POST') {
            console.log('sleeping..