Simple Crawler Tool: Simple Crawler + Proxy IP Package

I. Crawler blocked? You may be missing this artifact

Do data collection of friends understand, hard work to write the crawler suddenly shut down, nine times out of ten is the IP was pulled by the site black. At this time do not be in a hurry to change the code, first look at your crawler is not like a naked -I'm not wearing the proxy IP armor.The

To give a real example: last year, there is a brother to do e-commerce price monitoring, every day to catch hundreds of thousands of data. The first three days were smooth sailing, and on the fourth day, the data suddenly fell off a cliff. Later, he used a stupid way to reboot his home router to change the IP, and the result was that the next day was blocked even more...

Second, how did the proxy IP become a crawler savior?

In a nutshell.Keep changing the crawler's armor.. Here's a comparison table to visualize it better:

However, be aware that the quality of proxy IPs on the market varies. I have tested a service provider that claims to have a million IP pools, but 6 out of 10 are blacklisted IPs that have been flagged by major websites.

Third, hand to teach you to wear "protective armor" to reptiles

Here is a demonstration with Python's requests library, which can be understood in seconds by a novice:

import requests

 Here's an example of a proxy package using ipipgo
proxy = {
    'http': 'http://username:password@gateway.ipipgo.com:9020',
    'https': 'http://username:password@gateway.ipipgo.com:9020'
}

try.
    response = requests.get('Target site', proxies=proxy, timeout=10)
    print(response.text)
except Exception as e.
    print(f "The request went wrong: {e}")

Focusing on this username and password, which areipipgo's exclusive dynamic authentication mechanismThe proxy address is fixed, and the authentication information will automatically assign different export IP addresses. Unlike some platforms where you have to change the IP address frequently, their home proxy address is fixed, and the authentication information will automatically assign different exit IPs.

Fourth, the three major minefields in the selection of proxy IP packages

1. Blind faith in the number of IPs: A million IP pools are not as good as a thousand quality IPs, and many service providers have reused IPs
2. Not looking at responsiveness: The actual test of a proxy delay 800ms +, crawler efficiency directly chopped!
3. Ignore protocol support: Some websites must be accessed using HTTPS protocol, choosing the wrong proxy type is useless!

Here's a recommendation for ipipgoMixed packagesThe residential IP and enterprise data center IP of their house can be switched intelligently. Especially if you do long-term data monitoring, you haven't been blocked for three months with this package.

V. Practical guide to avoiding pitfalls

Recently helped a friend tuned a crawler project, share a few dry tips:
- Don't panic if you get a 403 error, change the User-Agent in the request header to the latest version of Chrome.
- Randomly sleeps for 3-8 seconds for every 50 data grabs, mimicking the rhythm of a real person's operation.
- Important items recommended for purchaseExclusive IP packages from ipipgoIt's more expensive but twice as stable.

VI. Frequently Asked Questions QA

Q: Can't I use a free proxy?
A: Last year's double eleven tried, 20 free agents in only 2 can use, crawl slow as a snail, the last data did not catch the end of the event are over.

Q: Do I have to change my proxy IP often?
A: Look at the frequency of use. If it's ipipgo's dynamic package, 15 minutes of automatic IP change is enough to deal with most anti-climbing mechanisms.

Q: Why do you recommend ipipgo?
A: three advantages: 1) self-built server room is not like a second-hand dealer 2) there are special crawler optimization packages 3) customer service response is fast, the last time we encountered problems at 2:00 a.m. are people to deal with!

VII. Speak the truth

Proxy IPs are not a panacea, but they do serve as infrastructure for crawlers. It is recommended that newbies start by gettingipipgo's per-measurement packagesIf you want to get the best out of your program, try a few hundred requests first to see how it works. Do not learn some people come up to buy the annual package, the results of the project yellow agent is not used up.

Lastly, I would like to remind you that when you encounter a particularly difficult website (such as an e-commerce giant), you can use ipipgo's residential agent in conjunction with the S5 agent, and this combination has not yet encountered an anti-climbing system that you can't take down.