JavaScript data acquisition: JS proxy request setup tutorial

Hands-on teaching you to use JS to mess with data capture

The biggest headache of data crawling is to be blocked IP, right? Old iron should have encountered the website suddenly do not allow you to access the situation. At this time it is necessary to rely on proxy IP to save the day, equivalent to their own vest, so that the server can not recognize who you are.

// As an example, set up a proxy with axios
const axios = require('axios');
const proxy = {
  host: 'ipipgo.proxy.com',
  host: 'ipipgo.proxy.com', port: 8000, auth: {
  auth: {
    username: 'Your account',
    password: 'Random password'
  }
}.

axios.get('Target URL', {proxy})
  .then(response => console.log('It's done!'))
  .catch(error => console.log('Rolled over'));

Proxy IP in the end how to choose reliable

There are all sorts of agency services on the market, butChoose the wrong type and you're out of luck.. Like we do data collection, we have to look at these three things:

1. Dynamic residential IP: suitable for high-frequency requests, change of armor for each visit
2. Static Residential IP: used in scenarios that require long-term session maintenance.
3. Data center IP: simple and brute force but easy to identify

To cite a real scenario: to catch the e-commerce price data, with ipipgo's dynamic residential enterprise version, every hour automatically change IP, pro-tested to catch 3 consecutive days were not blocked. Their TK line is particularly friendly to the e-commerce platform, know all understand.

A practical guide to avoiding the pit

Five common mistakes newbies make:

1. Proxy pool too small (prepare at least 50 IPs for rotation)
2. The request header is not camouflaged (remember to bring User-Agent)
3. Timeout settings too short (more than 15 seconds recommended)
4. Forgetting to deal with exceptions (make a good error retry mechanism)
5. Wrong protocol (90% site to go HTTPS)

// Example of proper posture
const puppeteer = require('puppeteer');
(async () => {
  const browser = await puppeteer.launch({
    args: ['--proxy-server=socks5://ipipgo.proxy.com:1080']
  });
  //... Subsequent operations
})().

The QA session you care most about

Q: What should I do if my proxy IP suddenly fails?
A: First check the protocol is not right, http and https do not confuse. If you use ipipgo, their background can see the IP survival status, it is recommended to ping before each request.

Q: What should I do if my overseas website loads slowly?
A: choose ipipgo cross-border line nodes, measured latency can be pressed to 200ms or less. Don't use the free agent, the speed can be anxious to death.

Q: Which package should I buy?
A: individual users choose dynamic standard version ($ 7.67 / GB), enterprise-level projects with enterprise version ($ 9.47 / GB), the need for a fixed IP to buy static version ($ 35 / IP). The first time you use it is recommended to buy a small package to try the water first.

Why recommend ipipgo

This is not a brainless blow, the actual test compared seven or eight service providers:
1. protocol support full (even the cold socks5 have)
2. Simple extraction (three lines of API code)
3. Ready-to-use client (computer and cell phone compatible)
4. fast customer service response (the last time I raised a work order at 2:00 a.m., someone actually answered it)

Finally, to tell the truth, this proxy IP thing is worth every penny. Used to know, reliable service providers can save at least 50% debugging time. Especially for long-term projects, don't pinch the cost on the proxy, or later maintenance can be tired into a dog.