const http = require('http');
const net = require('net');
const {URL} = require('url');
const url = require('url');

http.createServer((req, res)=>{
    let body = 'hello world\n';
    res.writeHead(+url.parse(req.url).pathname.substr(1)||200,
        {'Content-Length': body.length});
    res.end(body);
}).listen(80);

for (let proxy_port=12001; proxy_port<=12010; proxy_port++)
{
    const proxy = http.createServer((client_req, client_res)=>{
        var options = {
            hostname: client_req.headers.host,
            port: 80,
            path: client_req.url,
            method: client_req.method,
            headers: client_req.headers
        };
        let proxied = http.request(options, res=>{
            client_res.writeHead(res.statusCode, res.headers);
            res.pipe(client_res, {end: true});
        });
        client_req.pipe(proxied, {end: true});
    });
    proxy.listen(proxy_port, '127.0.0.1', ()=>{
        console.log('Listen '+proxy_port);
    });
}