Crawler agent: crawler agent automatic rotation system construction

First, why should we install a 'face changer' for reptiles?

Brothers engaged in crawlers have encountered this kind of shit: the target site suddenly blocked IP, hundreds of accounts directly scrapped. This is like using the same face every day to go to the bank to withdraw money, the security guards do not catch you catch who? At this time, we need to give the crawler the whole "face change magic weapon" - proxy IP automatic rotation system.

Let's take a real example: there is a team doing e-commerce price comparison, using a fixed IP to capture data for three days to be blocked. Later they usedDynamic residential IP for ipipgoThe IP pool of the company is large enough to provide thousands of "fake faces" for the crawlers, so the website can't tell the difference between the fake and the real. The key is that their IP pool is large enough, as if the crawler prepared thousands of "fake face", the site simply can not distinguish between true and false.

II. Do-It-Yourself Rotation System (Nanny Tutorial)

Don't be intimidated by the technical terms, but the core is actually just three components:Agent Pool, Validation Module, Scheduler. Here's a Python example to mess around with the ipipgo API:

import requests
from random import choice

 Get the latest IP pool from ipipgo
def get_proxy_pool(): api_url = "
    api_url = "https://api.ipipgo.com/fetch?type=dynamic&count=50"
    response = requests.get(api_url)
    return response.json()['proxies']

 Randomly pick an available IP
def random_proxy():
    pool = get_proxy_pool()
    return choice([f"{p['protocol']}://{p['ip']}:{p['port']}" for p in pool])

 Automatic switching on request
def crawler(url):
    proxies = {"http": random_proxy(), "https": random_proxy()}
    try.
        return requests.get(url, proxies=proxies, timeout=10)
    except.
        print("This IP is invalid, change it now!")
        return crawler(url)

Pay attention to be equipped with a set retry mechanism, it is recommended to set up 3 retries like the undead little strong. There is an advantage of using ipipgo's API - the IPs are freshly baked every time, much more stable than those second-hand IPs.

Third, choose the right type of agent to get twice the result with half the effort

Agents on the market are divided into three main categories to give you a real comparison:

Focus on the dynamic residential IP, this thing is like a local user's vest for the crawler. For example, if you use ipipgo's TK line, when you catch TikTok data, it shows the local home broadband IP, which is more reliable than the IP of the server room.

IV. Guidelines for avoiding pitfalls (blood and tears experience)

1. Don't try to be cheap.: I've used a 9.9 monthly subscription before, and 8 out of 10 IPs were black, not as good as my own broadband IPs!
2. Validation mechanisms should be diligent: It is recommended to check IP availability every 20 minutes, and immediately kick out the pool if it is invalidated.
3. There's something to be said for flow control: Don't make more than 500 requests per hour from a single IP, or else even a real residential IP won't be able to handle it.

There is a friend who does SEO monitoring, started to use static IP every day was blocked. Later, he changed to use ipipgo's Dynamic Residential Enterprise Edition, and set up a wave of IPs every 5 minutes, which is now running stably for more than half a year.

V. Demining of Common Problems

Q: What should I do if my proxy IP always fails?
A: Check two things: 1. Is not using the data center IP (easy to be identified) 2. request frequency is too high. It is recommended to change to ipipgo's Dynamic Residential Enterprise Edition, which comes with IP health detection.

Q: What's wrong with using a proxy instead of slowing down?
A：八成是选了跨国的数据中心IP。可以试试ipipgo的跨境专线，他们家有本地运营商线路，比普通代理快3倍不止

Q: How do small teams control costs?
A: Use the dynamic standard version of traffic billing, and then switch to a monthly subscription when the business stabilizes. ipipgo supports switching packages at any time, which is very friendly to startup teams.

VI. Speak the truth

The proxy system is not installed and everything is fine, it has to be served like a fish. Regularly:
1. Check IP pool viability (less than 80% requires a change of provider)
2. Update request header fingerprints (don't let websites recognize you by your browser characteristics)
3. Simulating the rhythm of a real person's operations (quick clicks are more suspicious than frequent visits)

Lastly, I'll settle for ipipgo's one-of-a-kind secret - theirSERP APIThe system is a direct way to save yourself the trouble of maintaining a proxy system. Especially do Google SEO brother, with this check ranking than self-built system to save more, data accuracy can also be maintained at 95% or more.