Get response from proxy server

Question

I created a proxy server in node.js using the node-http-proxy module.

Looks like this:

var http = require('http'), httpProxy = require('http-proxy'), io = require("socket.io").listen(5555); var proxy = new httpProxy.RoutingProxy(); http.createServer(function (req, res) { proxy.proxyRequest(req, res, { host: 'localhost', port: 1338 }); }).listen(9000);

So, I need, before sending the response back to the client to get the body from the server that I proxy and analyze it.

But I can't find event or attribute, where I can get this data. I tried:

proxy.on('end', function (data) { console.log('end'); });

But I can't figure our how to get the mime body from it.

FacePalm · Accepted Answer · 2014-11-21 11:46:58Z

If all you want to do is examine the response (read-only) , you could use :

proxy.on('proxyRes', function(proxyRes, req, res){ proxyRes.on('data' , function(dataBuffer){ var data = dataBuffer.toString('utf8'); console.log("This is the data from target server : "+ data); }); });

But , note that the 'proxyRes' event is emitted after the response is sent.

Reference in : https://github.com/nodejitsu/node-http-proxy/issues/382

This saved my life... actual documention at npmjs.com/package/http-proxy is very poor

Psycho · Accepted Answer · 2013-03-06 06:25:50Z

I found answer: I rewrite response function for body -

var http = require('http'), httpProxy = require('http-proxy'), io = require("socket.io").listen(5555); var proxy = new httpProxy.RoutingProxy(); http.createServer(function (req, res) { console.log(req.url); res.oldWrite = res.write; res.write = function(data) { /* add logic for your data here */ console.log(data.toString('UTF8')); res.oldWrite(data); } proxy.proxyRequest(req, res, { host: 'localhost', port: 1338 }); }).listen(9000);

This code will console all url request and response form this endpoint.

Point Networks · Accepted Answer · 2019-02-11 06:43:01Z

Based on the answer of @Psycho, following code can be used to modify headers as well

var server = http.createServer(function(req, res) { res.oldWrite = res.write; res.write = function(data) { console.log(data.toString('UTF8')); res.oldWrite(data); } res.oldSetHeader = res.setHeader res.setHeader = function(k,v) { console.log(k,v) res.oldSetHeader(k,v) } proxy.web(req, res, { target: proxyPool[key]}); })

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