Lightweight proxy server build (Node.js)

First, why should I toss my own proxy server?

Recently, I found that a lot of friends doing data collection are asking, using off-the-shelf proxy services always feel not flexible enough. For example, if you want to temporarily switch IP address, you have to wait for the customer service response, or it is too late to deal with sudden blocking. At this time to build a lightweight proxy server is particularly practical, like carrying a Swiss army knife, encounter problems at any time to pull out to solve.

Here to focus on, choose the right proxy IP resource is particularly critical. If you use those public free IPs, nine times out of ten, you will be recognized by the target website. I've tested it myself.ipipgos exclusive IP pool, the success rate can go up to 95% or more. Their IPs are real residential IPs used by real people, which is especially important when doing business that requires high anonymity.

Second, the hand to build Node.js proxy service

First, install a Node environment (you should be able to do this), then create a new folder with any name you want. Hit two lines in the terminal:

npm init -y
npm install http-proxy --save

Watch out for a pitfall here! Many people will installhttp-proxy-middlewareBut that's for a development server. What we need ishttp-proxyThis little powerhouse who specializes in retweets.

new constructionproxy.jsfile, the core code is just a few lines:

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

const proxy = httpProxy.createProxyServer();
http.createServer((req, res) => {
  proxy.web(req, res, {
    target: 'http://替换成ipipgo的代理IP:端口'
  });
}).listen(3000);

Third, how to play with ipipgo's proxy IP

Here comes the point! In theipipgo official websiteFind the API interface in the background, and we recommend picking the Dynamic Residential IP package. Their IP survival time can be customized and set from 5 minutes to 1 hour, which is especially suitable for scenarios that require frequent IP changes.

Fill in the proxy IP you just obtained into the code, and remember toTimed IP address updates. It is recommended to use their Webhook feature to automatically push the new address when the IP fails so that the service is not interrupted.

Fourth, the actual test to avoid the pit guide

Don't wait to use it after you run it, do three checks first:

1. In the terminal, typecurl --proxy http://localhost:3000 https://api.ipipgo.com/checkSee if the returned IP is correct
2. Use Postman to send 10 requests in a row and observe if the IP change is normal or not
3. Add an error catch in the code to automatically switch IPs when you encounter a ban:

   proxy.on('error', (err) => {
     console.log('Block triggered! Changing IP...') ))
     // This calls ipipgo's change IP interface.
   }); // Here we call ipipgo's change IP interface.
   

V. First aid kits for common problems

Q: What should I do if the proxy speed suddenly slows down?
A: Check the local network first, then use the ipipgo provided by theping test tool测代理节点。如果超过200ms，建议在后台切换机房位置。

Q: Always return 403 error?
A: 80% of the request header is exposed. Remember to set it in the code:

headers: {
  'User-Agent': 'Mozilla/5.0 (Windows NT 10.0) the proper browser', 'Accept-Language': 'zh-CN', 'Accept-Language': 'zh-CN'
  'Accept-Language': 'zh-CN'
}

Q: How to manage multiple proxy IPs in bulk?
A: Created in the ipipgo backendIP ClusterIt can manage hundreds of IPs at the same time. intelligent load balancing by setting traffic weights.

VI. Tips for upgrading your gameplay

For more stealth, try these tawdry maneuvers:

• Add Nginx in front of the proxy server for traffic distribution
• In conjunction with ipipgo'stime slot schedulingFunction, use office IP on weekdays, cut home IP on weekends
• Package proxy services as Docker images, ready to migrate to cloud servers

As a final reminder, while self-built agents are flexible, they are not cheap to maintain. For important business, it is recommended to directly useipipgo's enterprise-level proxy serviceThey have a 24-hour online technical support team that responds to problems in seconds, which is a lot less stressful than trying to do it yourself.