Proxy with nodejs

Question

I develop an webapp, against an api. As the api is not running on my local system, I need to proxy the request so I dont run in cross domain issues. Is there an easy way to do this so my index.html will send from local and all other GET, POST, PUT, DELETE request go to xyz.net/apiEndPoint.

Edit:

this is my first solution but didnt work

var express = require('express'),
    app = express.createServer(),
    httpProxy = require('http-proxy');


app.use(express.bodyParser());
app.listen(process.env.PORT || 1235);

var proxy = new httpProxy.RoutingProxy();

app.get('/', function(req, res) {
    res.sendfile(__dirname + '/index.html');
});
app.get('/js/*', function(req, res) {
    res.sendfile(__dirname + req.url);
});
app.get('/css/*', function(req, res) {
    res.sendfile(__dirname + req.url);
});

app.all('/*', function(req, res) {
    proxy.proxyRequest(req, res, {
        host: 'http://apiUrl',
        port: 80
    });

});

It will serve the index, js, css files but dont route the rest to the external api. This is the error message I've got:

An error has occurred: {"stack":"Error: ENOTFOUND, Domain name not found\n    at IOWatcher.callback (dns.js:74:15)","message":"ENOTFOUND, Domain name not found","errno":4,"code":"ENOTFOUND"}

score 5 · Accepted Answer · answered Sep 25 '11 at 15:38

5

Take a look at the readme for http-proxy. It has an example of how to call proxyRequest:

proxy.proxyRequest(req, res, {
  host: 'localhost',
  port: 9000
});

Based on the error message, it sounds like you're passing a bogus domain name into the proxyRequest method.

answered Sep 25 '11 at 15:38

Dan Cecile

2,403
19
21

You're right the host starts with 'http://'. Deleting this fix it. But know I've got an empty response: HTTP/1.1 400 Bad Request X-Powered-By: Express server: Apache-Coyote/1.1 content-length: 0 date: Sun, 25 Sep 2011 18:06:22 GMT connection: close – Andreas Köberle Sep 25 '11 at 18:07
@AndreasKöberle, for starters, I'd suggest editing this question, or opening a new question. – Dan Cecile Sep 25 '11 at 18:29
1

Ok I've asked a new question. http://stackoverflow.com/questions/7559862/proxy-with-nodejs-and-express – Andreas Köberle Sep 26 '11 at 18:54
What is a proxy for Node.js and why would someone need it? – Elegant.Scripting Mar 02 '16 at 21:36

score 2 · Answer 2 · edited Oct 28 '18 at 07:04

2

Other answers are slightly outdated.

Here's how to use http-proxy 1.0 with express:

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

var apiProxy = httpProxy.createProxyServer();

app.get("/api/*", function(req, res){ 
  apiProxy.web(req, res, { target: 'http://google.com:80' });
});

edited Oct 28 '18 at 07:04

Nate Anderson

18,334
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answered Mar 07 '14 at 07:35

Chandler

1,019
14
23

score 1 · Answer 3 · answered Jun 04 '14 at 08:58

Here is an example of the proxy which can modify request/response body.

It evaluates through module which implements transparent read/write stream.

var http = require('http');
var through = require('through');

http.createServer(function (clientRequest, clientResponse) {

    var departureProcessor = through(function write(requestData){

        //log or modify requestData here
        console.log("=======REQUEST FROM CLIENT TO SERVER CAPTURED========");
        console.log(requestData);

        this.queue(requestData);
    });

    var proxy = http.request({ hostname: "myServer.com", port: 80, path: clientRequest.url, method: 'GET'}, function (serverResponse) {

        var arrivalProcessor = through(function write(responseData){

            //log or modify responseData here
            console.log("======RESPONSE FROM SERVER TO CLIENT CAPTURED======");
            console.log(responseData);

            this.queue(responseData);
        });

        serverResponse.pipe(arrivalProcessor);
        arrivalProcessor.pipe(clientResponse);
    });

    clientRequest.pipe(departureProcessor, {end: true});
    departureProcessor.pipe(proxy, {end: true});

}).listen(3333);

score 0 · Answer 4 · edited May 23 '17 at 11:52

0

Maybe you should look at my answer here. Here I use the request package to pipe every request to a proxy and pipe the response back to the requester.

edited May 23 '17 at 11:52

Community

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answered Feb 28 '14 at 22:37

Stephan Hoyer

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Proxy with nodejs

4 Answers4

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