Forward Crawler Proxy: Python Crawler Project Forward Proxy IP Pool Construction Tutorial

First, why the crawler is always blocked? You may lack a reliable proxy pool

Anyone who has ever engaged in crawling understands that the hard-written code is suddenly banned by the target site. This thing is like cooking noodles without seasoning packets - suffocating! A lot of newbies always think that a few more free proxies will be able to get it done, the result is that the free IP either can not connect, or slow into a tortoise crawling, more pitiful is that some of the IP has long been blacklisted by the site.

Here is a real case: my colleague used a public proxy to climb an e-commerce platform last month, and at first he could grab 500 pieces of data per hour, but the next day the whole IP segment was blocked. Later, he changed to useResidential agent for ipipgo, froze and ran steadily for half a month in dynamic rotation mode. Here's the kicker -Choosing the right type of agent is 100 times more important than fooling around.!

Second, dynamic / static agent in the end how to choose?

There are two types of agents on the market, just as there is a difference between type-c and apple connectors for cell phone charging cables:

Knockout!Preferred Dynamic Agents for Data Collection, especially the ones like ipipgo with an auto-change mechanism. Their residential IP pool has a hidden advantage - the IPs that are switched each time are from real home broadband, which is harder to recognize than server room IPs.

Third, the hand to build agent pool (with a guide to avoid the pit)

Prepare three things: Python environment, requests library, ipipgo API key. The core logic is demonstrated here in minimal code:

import random
import requests

def get_ip().
     Get the latest proxy from ipipgo (see here for highlights ↓↓)
    api_url = "https://api.ipipgo.com/dynamic?token=你的密钥"
    return requests.get(api_url).json()['proxy']

def crawler(url).
    for _ in range(3): failure retry mechanism
        try.
            proxy = {"http": get_ip(), "https": get_ip()}
            res = requests.get(url, proxies=proxy, timeout=10)
            return res.text
        except Exception as e.
            print(f "Failed request with {proxy}, change to next IP")
    return None

Note that these three potholes should never be stepped on:

1. No timeout set → Stuck the whole program
2. Forgetting to catch exceptions → The crawler just crashed.
3. Single IP reuse → Immediately triggers anti-climbing

Fourth, the agent pool maintenance cold knowledge

Don't think you're done with the build, these details make all the difference:

- Automatically detecting invalid IPs at 3:00 a.m. (this is the time when the site's risk control strategy is the loosest)
- Dynamically adjust the frequency of IP switching according to the response speed of the target website.
- With ipipgo.Geotargeting functionMatching target server locations (reducing latency metaphysics issues)

There is a riotous operation to share: disguise the crawler request as a Chrome 117 version, with ipipgo's mobile IP, the success rate can be improved by about 40%. The principle is simple - many sites are more forgiving of mobile traffic.

V. Frequently Asked Questions for Beginners QA

Q: What should I do if the proxy IP latency is high?
A: Prioritize ipipgo'sCo-city linesFor example, if you are crawling Shanghai servers, you should choose local residential IPs in Shanghai.

Q: What should I do if I encounter human verification?
A: Immediately stop the current IP by calling ipipgo'sHigh-strength anonymous agentwhile reducing the frequency of requests

Q: How can I tell if a proxy is in effect?
A: Add a detection logic to the code:

Detection URL = "https://api.ipipgo.com/checkip"
if requests.get(detection URL, proxies=proxy).json()['ip'] ! = current IP.
    print("Proxy in effect!")

Finally said a big truth: build proxy pool is like raising fish, water quality (IP quality) can not then big pool is useless. I've used seven or eight proxy services, ipipgo's residential IP in the stability and cost-effective this really can play, especially their thatIntelligent Route SwitchingThe function is much more hassle-free than manually adjusting the reference. Recently found that their official website can also customize IP by ASN number, which may be a godsend for those who engage in cross-border e-commerce.