Here is my server.js:

const express = require('express');
const app = express();
const subdomain = require('express-subdomain');


app.use(subdomain('api', (req, res, next) => {
    console.log('Welcome to the API');
    next();
}));

app.listen(port, () => console.log('server is online...'));

And I send a post request to the subdomain route:

'https://api.example.com/'

But the code never reaches the console.log('Welcome to the API');

What I'm doing wrong ?