IP Proxy Application Guide in Node.js Crawler

Basic Principles of IP Proxy

When crawling web pages, in order to prevent being blocked by the target website or restricting the access frequency, we can use an IP proxy to hide the real request IP address.The basic principle of IP proxy is to send a request to a proxy server, and then the proxy server will send the request to the target website, so that we can realize the disguise of the IP address.

IP Proxy Settings in Node.js

In Node.js, we can use some third-party modules to implement IP proxy settings, such as request or superagent. the following is a simple example code:

const request = require('request');
const tunnel = require('tunnel');

const proxyUrl = 'http://username:password@proxy_ip:proxy_port'; // proxy server address
const proxiedRequest = request.defaults({ 'proxy': proxyUrl });

proxiedRequest.get('http://www.example.com', function(err, res, body) {
console.log(body);
});

IP Proxy Considerations

When using an IP proxy, you need to pay attention to some issues. First, choose a stable and reliable proxy server to avoid frequent changes of IP address leading to blocking. Second, it is necessary to carry out regular testing and maintenance of the proxy server to ensure the availability of the proxy. Finally, you should comply with the rules for using proxy servers and do not abuse the proxy service.

Through the above, I believe you have a deeper understanding of the application of IP proxy in Node.js crawler. I hope that you can reasonably set the IP proxy according to the needs in actual operation to improve the efficiency of crawling.