JavaScript crawler library: JS crawler library recommendations

First, why should we play crawler with proxy IP?

Brothers engaged in data capture understand that the target site anti-climbing mechanism is more and more ruthless. Take an e-commerce platform, the same IP continuous access to 20 times immediately black, this time to offer the proxy IP this magic weapon. It is like playing a game to open a small number, each time with a different IP access, the site simply can not tell whether you are the Li Kui or Li Ghost.

To cite a real case: last year, there is a price comparison system team, with the native IP to capture data three days to be blocked. Later, it was replaced by a dynamic proxy IP pool, which ran continuously for two months without overturning. Here is the focus of AmwayipipgoThe exclusive IP service, each IP with independent authentication, is more than one level more stable than those shared pool.

// Example of configuring the ipipgo proxy with axios
const axios = require('axios');
const tunnel = {
  host: 'gateway.ipipgo.com',
  
  auth: 'Your account:password'
};

axios.get('https://目标网站.com', {
  proxy: tunnel
}).then(response => console.log(response.data));

Second, these JS libraries with agent thieves slippery

Not all crawler libraries are suitable for proxy, the following are battle-tested:

Focus on Puppeteer withipipgoResidential agent's tawdry operation:

const puppeteer = require('puppeteer');

async function crawl() {
  const browser = await puppeteer.launch({
    args: [
      '--proxy-server=http://gateway.ipipgo.com:9021',
      '--disable-blink-features=AutomationControlled'
    ]
  });
  // Remember to replace your account password
  await page.authenticate({
    username: 'ipipgo account', password: 'password', // Remember to replace your account password.
    password: 'password'
  }); // Remember to replace your account password.
  // Follow up...
}

Third, to avoid the three major pits of the use of agents

Newbies often fall head over heels in these areas:

1. Timeout set too shortThe response speed of ipipgo is controlled within 800ms, this data is measured.

2. Forgetting to switch IPs: Even if you use a proxy, you should change it regularly, and it is recommended that you change the IP every 50 requests. ipipgo's API supports automatic switching, so it's a matter of adjusting the interface directly.

3. Leakage of authentication information: Don't hard-code your account passwords into your code, use environment variables!

IV. QA session: demining of high-frequency problems

Q: What should I do if the proxy IP suddenly fails to connect?
A: First ping the gateway address gateway.ipipgo.com, if you can get through, check whether the account is expired. If you can get through, check if your account has expired. If it continues to be anomalous, their customer service responds quickly, and the work order will be returned within 5 minutes!

Q: What if I need to process a CAPTCHA?
A: It is recommended to use ipipgo's fixed session proxy to keep the same export IP for the same business flow, so that when dealing with CAPTCHA with the coding platform, the session will not be invalidated due to IP changes.

Q: How can I tell if a proxy is in effect?
A: add a debug statement in the code, visit http://ip.ipipgo.com/checkip. Normal will return the current use of the proxy IP address, pro-test effective!

Fifth, the choice of agent services to see these hard indicators

There are a bunch of proxy service providers on the market, how do you pick a reliable one? Remember these key points:

• IP survival rate ≥ 95% (ipipgo background can check in real time)
• Average response <1 second
• Support http/https/socks5 protocols
• Complete usage statistics are available

Finally, a cold knowledge: many reptile veterans will buy multiple proxy services at the same time to do disaster recovery, but the actual test downipipgoThe stability of the enough single carry, there is no need to spend more money. Their IP pool is automatically refreshed every half hour, so you don't have to worry about IPs being flagged at all.