Web Crawl Python: Python Proxy Web Crawl

Hands-on teaching you to play with Python web crawling

What's the biggest fear of web crawling? Of course, it's IP blocking! Just like going to the mall to try on clothes is always being watched by the clerk, change clothes to continue shopping. Today, let's talk about how to use proxy IP as a "dress up", so that Python scripts into the crawling world of a hundred stars.

What the heck is a proxy IP anyway?

For example, your original IP address is like an ID number, site administrators see the same number of frequent visits, snapped you off in a small black room. Proxy IP is a temporary borrowed vest, each visit to change a new identity, so that the site thinks it is a different person in the operation.

Practical Python proxy configuration

Take the requests library as an example, let's use ipipgo's residential agent as a demonstration. His home agent pool is as big as the Pacific Ocean, and there is no fear of running out of water during peak hours.

import requests

proxies = {
    'http': 'http://username:password@gateway.ipipgo.com:9020',
    'https': 'http://username:password@gateway.ipipgo.com:9020'
}

response = requests.get('https://target-site.com', proxies=proxies, timeout=10)
print(response.text[:500]) print the first 500 characters to prevent scrubbing

Here's the point:Remember to replace username and password with your own authentication information obtained from the backend of ipipgo. Their agents support pay-per-volume, especially friendly to newbies, no need to hoard no pain.

Avoiding the Three Pitfalls of Proxy Use

1. Don't be lazy with timeout settings: some proxy nodes may have network delays, without the timeout parameter the script will become silly, etc.
2. Exception handling should be in place: wrap the request code in try...except and switch immediately when it encounters a failed proxy
3. There's something to be said for frequency control: Even if you use proxies, don't pull the wool over your eyes, it's safer to set a random wait time!

Frequently Asked Questions

Q: Can't I use the free agent?
A: free agent is like a public toilet, more people use sooner or later blocked. Professional things to professional tools, ipipgo's paid agent comes with cleaners, stability is too strong.

Q: How can I tell if a proxy is in effect?
A: You can visit http://httpbin.org/ip查看当前IP. If the returned IP is not the same as the local machine, it means the proxy is effective!

Q: What should I do if I encounter a website asking for a verification code?
A: It's not enough to just change the IP at this point, you have to work with ipipgo's intelligent parsing service. Their dynamic proxy can automatically handle common authentication mechanisms, the degree of worry is comparable to autopilot.

Upgrade Play: Agent Pool Rotation

Here is an advanced tip for you - use ipipgo's API to realize dynamic IP switching. It's like playing a game where you replenish blood immediately when the blood bar is empty, ensuring that the collection mission runs like a perpetual motion machine.

from itertools import cycle

def get_proxies().
     Call the ipipgo API to get the latest list of proxies.
    api_url = "https://api.ipipgo.com/get_proxies?format=json"
    return [f "http://{p['ip']}:{p['port']}" for p in requests.get(api_url).json()]

proxy_pool = cycle(get_proxies())

for page in range(1, 101): current_proxy = next(proxy_pool)
    current_proxy = next(proxy_pool)
    print(f "Grabbing page {page} with {current_proxy}")
     Stuff current_proxy into requests and get on with it.

这套组合拳打下来，别说普通反爬了，就算遇到阿里系那种铜铁壁也能撕个口子。不过要注意遵守网站robot协议，咱做技术的不当网络流氓。

The last nagging sentence, choose the proxy service provider with the object like, reliable most important. ipipgo in the industry to climb five or six years, the response speed than the delivery boy faster, the drop rate is lower than the plane late. Especially theirBusiness Level Agent PackageThe old iron in need might want to give it a try, as it's a solid batch for doing large-scale acquisition projects.