In nodejs trying to get http-proxy to forward requests passing through query string parameters

http-proxy, node-http-proxy, node.js, proxy

Solution

I got this working by changing the `req.url` to contain the querystring params and pass the hostname only to the `apiProxy.web` `target` parameter:

app.use('/*', function(req, res) {
    var proxiedUrl = req.baseUrl;
    var url = require('url');
    var url_parts = url.parse(req.url, true);
      if (url_parts.search !== null) {
        proxiedUrl += url_parts.search;
    }

    req.url = proxiedUrl;

    apiProxy.web(req, res, {
      target: app.host
    });
});

Problem

How do I proxy requests with query string parameters in nodejs, I am currently using express and http-proxy? I have a nodejs application using express and the http-proxy module to proxy HTTP GET requests from certain paths on my end to a third party API running on the same server but a different port (and hence suffering from the same origin issue, requiring the proxy). This works fine until I want to call a REST function on the backend API with query string parameters i.e. "?name=value". I then get a 404. ``` var express = require('express'); var app = express(); var proxy = require('http-proxy'); var apiProxy = proxy.createProxyServer(); app.use("/backend", function(req,res){ apiProxy.web(req,res, {target: 'http://'+ myip + ':' + backendPort + '/RestApi?' + name + '=' + value}); }); ``` Chrome's console shows: ``` "GET http://localhost:8080/backend 404 (Not Found)" ``` Notes: I use other things in express later, but not before the proxying lines and I go from more specific to more general when routing paths. The backend can be accessed directly in a browser using the same protocol://url:port/path?name=value without issue.

Original source