Dynamic IP rotation system construction whole process

Hands-on with a crawler system that changes its own armor.

What is the biggest fear of those who are engaged in web crawlers? IP blocking! Today, let's talk to you about how to give your program a set ofauto-IP changeThe equipment is guaranteed to make your crawler as slippery as a loach and can't be sealed.

Why vest the program?

Now the site is very fine, the same IP frequent visits immediately to you blacklisted. This is like you go to the supermarket to try to eat, even go ten times the security guards are going to stare at you. Dynamic IP rotation is to let the program every visit areGet a new vest.There are millions of IP addresses in the IP pool at ipipgo's house, enough for you to change them every day.

Four Steps to Build a Dressing System

Step 1: Find a reliable IP provider
Proxy IP service providers on the market are a mixed bag, focus on these indicators:

This is a must.ipipgoNot only is their IP pool big enough, but they have a one-of-a-kind--Intelligent Routing, automatically matching you with the fastest line.

Step 2: Install an IP scheduler
It is recommended to use Python's requests library with random proxy middleware, the code looks like this:

import requests
from itertools import cycle

proxies = cycle(ipipgo.get_proxies()) This calls the ipipgo API.

def crawler(url): current_proxy = next(proxies)
    current_proxy = next(proxies)
    try.
        return requests.get(url, proxies={"http": current_proxy, "https": current_proxy})
    except: return crawler(url)
        return crawler(url) Automatically switch to the next IP address.

Step 3: Setting the Dressing Frequency
Don't be silly and change your IP every second, base it on your target site's anti-crawl strategy. General rule:

• General site: change every 5-10 minutes
• Medium protection: change every 2-3 minutes
• Metamorphosis level protection: change IPs for every request (this is where ipipgo's large IP pool comes in handy)

Step 4: Get an IP health check
It's recommended to make aIP Physical Examination SystemIf you want to check whether a proxy IP is alive or not, you can do so at regular intervals. Here's a tip: useHEADThe method requests the favicon.ico of the target website, which saves traffic and allows for quick detection.

Handbook on Mine Clearance of Common Problems

Q: What is the difference between a dynamic IP and a static IP?
A: Dynamic IP is like a temporary laborer, using one time to change another; static IP is a long-term laborer, suitable for the need to maintain the login status of the scene. Crawlers, of course, should use dynamic IPs for this kind of unseen work.

Q: What should I do if I use a dynamic IP and still get blocked?
A: 80% of the IP quality is not good. It's time to changeipipgoThe high stash of proxies, their IPs are all home-grade real IPs, more than ten times more reliable than server room IPs.

Q: How do you control agency costs?
A: ipipgo has aFlow RecoveryThe features work exceptionally well, with no traffic deduction for failed requests. Combined with their step pricing, large users can save half their budget.

Lastly, a warning to newbies: don't buy a junk proxy on the cheap, when the time comes to be blocked, not to mention, delaying the progress of the project is really fatal. UseipipgoThe agent service, although expensive but worry ah, out of the question they respond to technical customer service within ten minutes, than some half a day does not return the message much stronger.