express和net模块实现的反向代理

express

var express = require('express');
var request = require('request');
var app = express();
app.use('/', function (req, res) {
    var url = 'http://10.200.8.220/' + req.url;
    req.pipe(request(url)).pipe(res);
});
app.listen(process.env.PORT || 3000);

net

var net = require('net');
// parse "80" and "localhost:80" or even "42mEANINg-life.com:80"
var addrRegex = /^(([a-zA-Z\-\.0-9]+):)?(\d+)$/;
var addr = {
    from: addrRegex.exec(process.argv[2]),
    to: addrRegex.exec(process.argv[3])
};

if (!addr.from || !addr.to) {
    console.log('Usage: <from> <to>');
    return;
}

net.createServer(function (from) {
    var to = net.createConnection({
        host: addr.to[2],
        port: addr.to[3]
    });
    from.pipe(to);
    to.pipe(from);
}).listen(addr.from[3], addr.from[2]);