Web Crawler Tools: Web Agent Crawler Development Practice

How do you choose a tool for proxy crawlers?

Brothers engaged in data collection understand that those crawler tools on the market as much as the carrots in the market. But the real good use of those a few, like Scrapy framework to use smooth, Requests library is also old. Focus on a secret - choose the tool to see it!Proxy CompatibilityThe first thing you need to do is to change eight hundred parameters in the proxy settings of some tools. Some tools proxy settings to change eight hundred parameters, have not yet begun to collect blood pressure first up.

 Let's take the Requests proxy setup as an example.
import requests

proxies = {
    'http': 'http://username:password@gateway.ipipgo.cc:3000',
    'https': 'http://username:password@gateway.ipipgo.cc:3000'
}
response = requests.get('Target site', proxies=proxies)

The Three Pitfalls of Proxy IP Configuration

Newbies are most likely to be planted in these three places: 1) Wrong proxy format (the colon into Chinese punctuation), 2) did not deal with authentication information (especially dynamic residential agent), 3) unreasonable timeout settings (recommended 3-5 seconds). If you use ipipgo, there is a lazy way, their client directly generate configuration files, copy and paste can be used.

Anti Anti Climbing Tips

Website protection is like a security door, we have to prepare the master key. Let's start with a trick:Dynamic Residential Agents + Randomized UAThe golden pair. Take ipipgo's Dynamic Residential Package for example, which automatically changes IPs with each request, and works with the fake_useragent library to make the site think it's being viewed by a real person.

from fake_useragent import UserAgent
ua = UserAgent()

headers = {
    'User-Agent': ua.random, 'Accept-Language': 'zh-CN,zh;q=0.9'
    'Accept-Language': 'zh-CN,zh;q=0.9'
}

Don't panic when you encounter a CAPTCHA, try this trick: set the request interval to3-8 seconds random delayIt's a good idea to have a good time. Just like people typing fast and slow, don't let the site find the pattern. ipipgo's static residential packages come in handy at this time, long-term stable IP instead of more secure.

E-commerce price monitoring case

Take a real case: a price comparison platform needs to monitor 30 e-commerce sites. With the ordinary proxy was blocked twice in three days, changed to ipipgo TK line, the collection success rate from 47% soared to 92%. key code so written:

 PHP sample code
$proxy = "gateway.ipipgo.cc:3000";
$context = stream_context_create([
    'http' => [
        'proxy' => "tcp://$proxy",
        'request_fulluri' => true,
        'header' => "Proxy-Authorization: basic " . base64_encode("Account:Password")
    ]
]);
$data = file_get_contents('Target Link', false, $context);

Frequently Asked Questions QA

Q: Proxy IP always can't connect?
A: First check the whitelist settings, remember to add the server IP in the background if you use ipipgo. and then test the local telnet gateway port, 80% is a fire problem.

Q: What can I do if I don't collect all the data?
A: Eighty percent triggered the site's wind control, try reducing the number of concurrency. Use their enterprise package, which supports multi-threaded automatic IP switching, much better than single-handedly.

Tips for choosing a package

There's a big difference between the ipipgo packages:

• Dynamic residential (standard): suitable for novice practitioners, more than 7 yuan 1G flow enough to play half a month
• Dynamic Residential (Enterprise): with automatic load balancing and a blistering price/performance ratio at $9+.
• Static Residence: a must for doing account maintenance, 35 bucks a month without the heartache

Lastly, don't be so hard on yourself when it comes to CAPTCHA. The use of coding platform to use, proxy IP is not everything. But if you choose the right proxy service provider, you can solve at least 80% of the collection problems. We do reptiles, about alit. set four pairs of pounds equal a thousand pounds (idiom); fig. to act as a go-betweenThe