Proxt

gistfile1.js

var httpProxy = require('http-proxy');

httpProxy.createServer(function (req, res, proxy) {
    var buffer = httpProxy.buffer(req);

    middleware(res, function() {
        console.log("The request was proxied");
    });

    proxy.on('proxyError', function () {
      proxy.proxyRequest(req, res, {
        host: 'nextHost.com',
        port: 80,
        buffer: buffer
    });

    proxy.proxyRequest(req, res, {
      host: 'google.com',
      port: 80, 
      buffer: buffer
    });

}).listen(9091);


function middleware(res, callback) {
    var _end = res.end;
    res.end = function(data) {
        _end.call(res, data);
        if (callback) callback();
    }
}