Python web crawler code: Python proxy crawler code example

What to do when a Python crawler encounters backcrawl? Try this trick

We are engaged in crawling brothers know, now the site protection more and more strict. Yesterday just wrote a good crawler, today may receive a 403 forbidden. this time we have to pull out the magic weapon - theproxy IP. Just like playing a game where you change skins to avoid being chased, a proxy IP allows the server to think that every request is for a new player.

Practical: to the crawler to wear a cloak of invisibility

Straight to the point, using the requests library as a chestnut. Focus on how to embed ipipgo's proxy service:

import requests

 Replace this with your own ipipgo proxy information
proxy_config = {
    'http': 'http://用户名:密码@gateway.ipipgo.com:9020', 'https': 'http://用户名:密码@gateway.ipipgo.com:9020'
    'https': 'http://用户名:密码@gateway.ipipgo.com:9020'
}

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

Notice here thegateway.ipipgo.comIt is the ipipgo access address, and the port may be different for different packages. A common mistake newbies make is forgetting to replace the username and password, which is like going to an Internet cafe with a fake ID and being recognized on the spot.

Essential Tips for Advanced Players

1. Dynamic rotation of IP pools: Get new IPs in real time with ipipgo's API to avoid individual IPs being targeted!
2. Failure Retry Mechanism: Don't panic when you encounter a 429 status code, take a 5-second break and change your IP and fight again!
3. speed control: Don't send requests like a hungry wolf, set a reasonable delay time

A guide for white people to avoid the pit (QA)

Q: What should I do if the proxy IP speed is fast or slow?
A: It is recommended to use ipipgo's exclusive package, the public pool may be shared by many people. I tested before, their dynamic line response can be controlled within 800ms.

Q: What package should I choose to crawl a large amount of data?
A: Choose according to the business scenario:
- Pay-as-you-go for short-term projects
- Monthly subscription for long term needs
- High concurrency remember to open multithreading + IP pooling

Q: What happened to the code running and getting stuck?
A: 80% is not doing exception handling. requests remember to set the timeout parameter, it is recommended not to exceed 15 seconds. ipipgo's background has real-time monitoring, found that the connection problems can be cut in a timely manner line.

Say something from the heart.

Proxy IP is not a panacea, with other means. Like cooking to master the fire, crawler to control the frequency of requests. Recently, I helped a friend to adjust an e-commerce price comparison crawler, with ipipgo's residential proxy + random UA header, stable run for two months without turning over.

A final reminder for newbies:Free agents are the pits.! If it is not, the data will be leaked, and if it is not, the IP segment will be blocked. Professional things to professional people to do, like ipipgo this kind of self-built server room reliable service provider, with much more worry.