server.js

const http = require('http');
const url = require('url');
const port = 8000;

const requestHandler = (request, response) => {
    console.log(request.url);
    const parsedUrl = url.parse(request.url, true);
    const parsedUrlQuery = parsedUrl.query;
    console.log(parsedUrlQuery);
    if (parsedUrlQuery.name && parsedUrlQuery.city) {
        response.end(`Hello, ${parsedUrlQuery.name} from ${parsedUrlQuery.city} !`);
    } else if (parsedUrlQuery.name === '' && parsedUrlQuery.city === '') {
        response.end('Hello, <name> from <city>!')
    } else {
        response.end('Please provide name AND city parameters')
    }
};

const server = http.createServer(requestHandler);

server.listen(port, (err) => {
    if (err) {
        console.error('Something bad happened');
    } else {
        console.log(`server is listening on ${port}`)
    }
});