How do I use node.js http-proxy for logging HTTP traffic in a computer?

Question

I am trying to implement the simplest example:

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

httpProxy.createServer(function (req, res, proxy) {
    //
    // I would add logging here
    //
    proxy.proxyRequest(req, res, { host: 'www.google.com', port: 80 });
}).listen(18000);

When I configure my browser to use this proxy and I navigate to www.google.com I receive no response. What is that I am doing wrong?

I'm using Windows 7 Chrome

Can you specify what OS and what browser? Each handles proxies differently. — badunk
– badunk, Commented Jun 11, 2012 at 18:21
Is this working for you with the latest changes in the library? Seems like now it is mandatory to pass the target field in the options otherwise just simply running the above code gives me Must provide valid URL for target — Ayush Goel
– Ayush Goel, Commented Dec 15, 2017 at 18:50

drac_o · Accepted Answer · 2021-09-26 17:42:34Z

6

Here is an simple example how to log requests. I use a similar to log all my domains to one database.

I copied much from http://blog.nodejitsu.com/http-proxy-middlewares (archived)

var fs = require('fs'),
    http = require('http'),
    httpProxy = require('http-proxy'),
        
logger = function() {    
  // This will only run once
  var logFile = fs.createWriteStream('./requests.log');

  return function (request, response, next) { 
    // This will run on each request.
    logFile.write(JSON.stringify(request.headers, true, 2));
    next();
  }
}

httpProxy.createServer(
  logger(), // <-- Here is all the magic
  {
    hostnameOnly: true,
    router: {
      'example1.com': '127.0.0.1:8001', // server on localhost:8001
      'example2.com': '127.0.0.1:8002'  // server 2 on localhost:8002
  }
}).listen(8000);

edited Sep 26, 2021 at 17:42

drac_o

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answered Dec 31, 2012 at 0:19

davl

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2 Comments

Valip Over a year ago

Should this still be working? I'm trying to log the requests when I access different urls but can't figure it out...

Ayush Goel Over a year ago

This doesn't work anymore, as now it is mandatory to pass some kind of a target or a forward field in the options. Running the above code gives me Must provide valid url for Target.

silverfighter · Accepted Answer · 2012-06-11 18:16:47Z

1

I am not sure if this helps because the posted information are really short. But I found a post that they updated the api ...

you might want to check out this post:

Updating to node-http-proxy v0.5.0 http://blog.nodejitsu.com/updating-node-http-proxy

answered Jun 11, 2012 at 18:16

silverfighter

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1 Comment

Christian Sirolli Over a year ago

Wayback archive link: web.archive.org/web/20160310162833/http://blog.nodejitsu.com/…

J.R · Accepted Answer · 2022-01-19 14:45:40Z

0

I done like logging the request headers object on the event proxyReq

const http = require('http'),
    httpProxy = require('http-proxy'),
    fs = require('fs');

const proxy = httpProxy.createProxyServer({});

const logFile = fs.createWriteStream('./requests.log');

proxy.on('proxyReq', function (proxyReq, req, res, options) {
    //Log incoming request headers
    logFile.write(JSON.stringify(req.headers, true, 2));
});

const server = http.createServer(function (req, res) {
    proxy.web(req, res, {
        changeOrigin: true,
        target: 'example1.com'
    });
});

console.log("listening on port 5050")
server.listen(5050);

answered Jan 19, 2022 at 14:45

J.R

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