Cheerio NPM Package: Proxy IP to Improve Node.js Crawler Efficiency

Hands-on with proxy IP to the crawler to renew the life of the

Engaged in crawling the little rookie must have encountered such a bad thing: code running suddenly blocked IP! At this time it is time for the proxy IP debut, equivalent to the crawler prepared a bunch of vests, blocked one immediately change the next one.

Why do I have to use a proxy IP?

A lot of sites are loadedrisk management radarThe same IP frequent visits immediately show the original shape. Tested found that: with a single IP crawl e-commerce data, an average of 15 minutes to be pulled black. And with the proxy IP pool crawler, continuous work for 8 hours are fine.

// Typical blocked scenario
const crawler = async () => {
  for(let i=0; i<1000; i++) {
    await axios.get(' target site '); // Single IP high-frequency access
  }
}

Cheerio + Proxy IP's Golden Combination

The Cheerio library is like a little HTML butler, but it's not enough. You need a proxy IP to make it work.the Three No's (abbreviated catchphrase): No blocking, no lagging, no data loss. Here's a chestnut with ipipgo's service:

const axios = require('axios');
const cheerio = require('cheerio');

// Proxy information from ipipgo
const proxy = {
  host: 'gw.ipipgo.com',
  port: 9021, auth: {
  auth: {
    username: 'Your account',
    password: 'Dynamic password'
  }
}.

async function safeCrawler(url) {
  try {
    const response = await axios.get(url, {
      proxy, timeout: 5000
      timeout: 5000
    }); const $ = cheerio.load(response.dataout)
    const $ = cheerio.load(response.data);
    // Write your parsing logic here...
  } catch (error) {
    console.log('Changing IPs to keep doing it!') ;)
  }
}

ipipgo's one-of-a-kind tips

There are so many proxy services on the market, but it's still ipipgo that is the smoothest to use. Their home has three particularly powerful axes:

A special shout-out to theirIntelligent RoutingThe function can automatically select the fastest node. The last time to do price comparison plug-in, with ordinary agents to 20 seconds to catch a commodity, change ip ipgo directly after soaring to 3 seconds a.

A practical guide to avoiding the pit

Three common mistakes newbies make:

1. Proxy IP did not set the timeout, causing the program to fake dead
2. Forgot to do an exception retry and got down when I encountered a CAPTCHA
3. IP switching too often triggers secondary wind control

It is recommended to configure the parameters in this way:

// Robust configuration scheme
const SAFE_CONFIG = {
  retry: 3, // number of failed retries
  rotateInterval: 60 // change IP every 60 seconds
  timeout: 8000 // timeout threshold
}

question-and-answer session

Q: Does proxy IP slow down the speed?
A: A good agent but faster! ipipgo's BGP line is more than 3 times faster than home broadband, the actual test download 1MB page as long as 0.8 seconds!

Q: How can I prevent my account from being blocked?
A: Remember two tricks: ① rotate with more than 5 IPs at the same time ② randomize the access interval (between 0.5-3 seconds)

Q: Is ipipgo expensive?
A: Newcomers have20RMB Experience PackageThe enterprise version supports pay-per-use, which is only $9.80 for 10,000 requests. The enterprise version supports pay-per-volume, 10,000 requests is only 9.8 dollars, cheaper than buying coffee!

Finally, a nagging word: now the site anti-climbing more and more strict, last year, you can run naked to catch the data, this year, not to use the agent simply can not play. Early on ipipgo this kind of professional services, save time enough for you to take a few more private work.