Python Build Web Crawler: Python Agent Crawler Construction

First, why is your crawler always pulled by the site?

Crawler friends have encountered this bad thing - just run a couple of programs on the site to block the IP. this is like you go to the supermarket to try to eat, caught the same cookies to eat more than a dozen times, the security guards do not bomb you only strange. The anti-climbing mechanism of the site than the supermarket security guards can be much more ruthless, directly to your IP seal.

Last year I helped a friend to grab some e-commerce data, and the local IP was banned just after launching 20 requests. Then I changed three cloud server IPs, and they were all blacklisted. That's when I realized thatYou're looking for death if you try to take on an anti-climbing system alone.The

Second, the proxy IP is the reptile life preserver

Proxy IP is the equivalent of wearing a vest to the crawler, each visit to change the identity. It's like going to a masquerade ball and changing your outfit every half hour, so the security guards won't recognize the same person. Here we should focus on the proxy service of ipipgo.Residential Proxy IPParticularly suitable for scenarios requiring high anonymity.

Third, hand to teach you to use Python + agent to engage in crawler

The following code demonstrates how to use the requests library with the ipipgo proxy:

import requests

def crawler_with_proxy(url).
     Proxy information from ipipgo
    proxies = {
        "http": "http://user:pass@gateway.ipipgo.com:9020",
        "https": "http://user:pass@gateway.ipipgo.com:9020"
    }

    try.
        response = requests.get(url, proxies=proxies, timeout=10)
        if response.status_code == 200: return response.
            return response.text
        else.
            print("Status code encountered:", response.status_code)
    except Exception as e: print("Status code encountered:", response.status_code)
        print("Request error:", str(e))

 Example of use
data = crawler_with_proxy("https://target-site.com/data")

Note that you have to replace the user and pass with the account you registered with ipipgo, their homeSupports pay-per-useThe new users have 5G of traffic for free trial, which is quite conscientious.

Fourth, the proxy crawler three major pitfalls to avoid the guide

1. Don't use free proxies for cheapNine out of ten of those publicly available free proxies don't work, and the rest are probably stealing your data.

2. Remember to set a timeout: timeout=10 like above to avoid jamming the program

3. Rotating IPs should be random enough: ipipgo's API can dynamically obtain proxies, it is recommended to change the IP for each request.

V. Frequently Asked Questions QA

Q: Is it illegal to use a proxy IP?
A: As long as you don't crawl sensitive data, don't engage in malicious attacks, normal data collection is completely legal. ipipgo all agents have been strictly compliance audits.

Q: What should I do if my proxy IP responds slowly?
A: Choose a node that is close to the target server. ipipgo supports the selection of proxy nodes by country/city, so that the speed increase can be seen immediately.

Q: What should I do if I encounter a website asking me to log in?
A: with the browser fingerprinting simulation, it is recommended to use selenium + ipipgo proxy combination program, the specific operation you can see their technical documents

Six, how to choose the most cost-effective agent package

Recommendations for those with different needs based on my experience with them:

• Personal small projects: choose the basic version of 50G / month, enough to use without waste
• Enterprise-level acquisition: directly on the enterprise version, support customized IP purity
• Special Needs: Contact ipipgo customer service for a test account, their technical support response is quite fast!

Finally, to tell the truth, do not use proxy IP reptiles like driving without insurance, save that little money in a minute to let you blood money. Now go to ipipgo official website to register, you can also get a 3-day trial of the enterprise version, personally tested effective not fooled.