node.js: route request to different port on same host

Question

I have a host computer which serves a number of webapplications (not node.js based). It does this using different ports. This means that for example the following applicatio

Answer 1

There is a nice http-proxy lib designed exactly for that!

const httpProxy = require('http-proxy');
const url = require('url');

const proxy = httpProxy.createProxy();
const options = {
    '/app/app1': 'http://localhost:3000',
    '/app/app2': 'http://localhost:3001',
    '/app/app3': 'http://localhost:3003',
}

require('http').createServer((req, res) => {
    const pathname = url.parse(req.url).pathname;
    for (const [pattern, target] of Object.entries(options)) {
        if (pathname === pattern || 
            pathname.startsWith(pattern + '/')
        ) {
            proxy.web(req, res, {target});
        }
    }
}).listen(80);