native nodejs health endpoint

server.js

const http = require('http');

const server = http.createServer((req, res) => {
    if(req.url === '/health') {
        res.setHeader('Content-Type', 'application/json');
        res.end(new Buffer.from(JSON.stringify({status: 'UP'})));
    } else {
        res.statusCode = 404;
        res.end('Not Found\n');
    }
});

server.listen(3999);