Node.js Proxy Server: Building an HTTP Proxy Tutorial

Hands-on with Node.js to build a proxy server

Recently, many partners are asking how to get a proxy server, today we will use Node.js to the whole one. Don't worry, even if you are just getting started, follow the steps to get it done. The point is to useipipgoThe proxy IPs of your requests are guaranteed to be as steady as an old dog.

Don't be lazy with your preparation.

Make sure you have these things on your computer first:
- Node.js (recommended to install the latest LTS version)
- Any code editor (VSCode, Sublime, whatever)
- Terminal/command line tools
- ipipgo account (sign up and get an experience package)

// Make a home for the project first
mkdir my-proxy && cd my-proxy
npm init -y

// Install the core dependencies
npm install http-proxy express axios

Core Code Revealed

new constructionproxy.jsfile, stuff the following piece of code in there. Watch out for the comments where you have to fill in your ownipipgoAccount Information.

const express = require('express');
const { createProxyMiddleware } = require('http-proxy-middleware');

const app = express();

// See here for key configuration ↓
app.use('/', createProxyMiddleware({
  target: 'http://目标网站.com',
  
  auth: 'username:password', // authentication information provided by ipipgo
  router: {
    'specific path': 'http://ipipgo专属代理IP:端口'
  },
  onProxyReq: (proxyReq, req) => {
    // Custom request headers can be added here
    proxyReq.setHeader('X-Proxy-Source', 'ipipgo');
  }
})));

// Start the service
app.listen(3000, () => {
  console.log('The proxy service has started → http://localhost:3000');
});

Configuration Tips to Highlight

To make the agent work better, these parameters have to be played with:

A practical guide to avoiding the pit

A few common pitfalls encountered by newbies:
1. Request stuck → Checkipipgowhether the IP is valid or not
2. Return 403 error → Confirm that the authentication information is not filled in (username:password format).
3. Some sites don't load well → configure subpaths separately in router
4. Suddenly can not connect → Try to restart the service + refresh the IP pool

QA time

Q: How often is it appropriate to change the proxy IP?
A: Depends on the specific business volume, crawlers are recommended to change a batch every 5 minutes. UseipipgoThe auto-rotation feature can save a lot of work.

Q: How can I test whether the agent is effective?
A: Add a middleware in the code to print the request log. Or just visit the ip detection website.

Q: What should I do if I encounter restrictions on HF access?
A: withipipgoThe enterprise version of the package, comes with IP pool load balancing, pro-test 200 + requests per second stable very much.

Why ipipgo?

The biggest headache is the quality of the IP. A bunch of free proxies on the market look beautiful, but when you use them, they either drop or slow down to a snail's pace. I've usedipipgoAs you know, his IP pool is updated quickly, especially the one thatIntelligent RoutingFunction, can automatically select the fastest line. The last time I helped a customer do data collection, use another family's card half a day, change his family directly take off.

Lastly, remember to do a stress test when the proxy server is ready. If you are too lazy to do so, you can just useipipgoThe ready-made API, a few lines of code can be connected to it, saving time, effort and no trouble.