simple http proxy

http-proxy.js

/*
client connects to proxy.example (via HTTP or HTTPS - depends on the proxy setup, but either is basically fine)
client  sends "CONNECT remote-server.example:443" to the proxy server
The proxy server connects to that address
The proxy server responds to  client  with 200 OK, and then all future bytes are passed raw between  client   & the remote server
*/

// https://stackoverflow.com/questions/18340414/what-should-i-do-with-a-connect-event
const net = require('net');
const http = require('http');
const PORT = 8080;

const server = http.createServer();

server.on('connect', (req, clientSocket) => {
    const url = new URL(`http://${req.url}`);
    const serverSocket = net.connect(url.port || 443, url.hostname, () => {
        clientSocket.write('HTTP/1.1 200 Connection Established\r\n\r\n');
        clientSocket.pipe(serverSocket);
        serverSocket.pipe(clientSocket);
    });
});

server.listen(PORT);