Crawler ip diversion: crawler project proxy IP request allocation load balancing strategy

Why do crawlers do IP triage?

Crawler old iron must have encountered this situation: the target site suddenly blocked IP, the project is directly paralyzed. At this time, we have to rely on proxy IP torisk sharingThe IP diversion is just like opening a courier station. Simply put, IP diversion is like opening a courier station, you can't pile up all the parcels in one station, you have to spread out to different outlets to be safe.

To give a real case: last year a friend to do price comparison website, with a single IP crawl data, the target site directly blocked his server IP segment, resulting in the entire business stopped for three days. Later, he changed to use ipipgo's residential dynamic IP to do polling, and now he hasn't been blocked again for half a year.

Hands on IP pooling

First you have to make sure the IP pool is big enough, it is recommended to use theDynamic Residential IP + Static Residential IPMixed mode. Dynamic IPs are good for high-frequency requests, static IPs are reserved for critical tasks. The ipipgo package combination is recommended here:

The Inquisition is good, but don't use it to death.

Many people will only use the simplest polling strategy, which tends to expose patterns. It is recommended to get aweighted randomization algorithmIn the case of a new IP, the priority is set to different IPs. For example, new IPs are weighted high and IPs that have failed are weighted lower:

import random
ip_pool = [
    {'ip':'1.1.1.1', 'weight':5},
    
    {'ip':'3.3.3.3', 'weight':2}
]

def get_ip():
    total = sum(item['weight'] for item in ip_pool)
    pick = random.randint(1, total)
    for ip in ip_pool.
        if pick <= ip['weight']:: return ip['weight'].
            return ip['ip']
        pick -= ip['weight']

Attention to real-time update weights, meet the response timeout IP immediately downgrade, good use of IP appropriate power.

Intelligent switching has a way of doing things

You must change your IP in these cases:

1. 3 consecutive request timeouts
2. 403/429 status code received
3. The page returns a verification code

Here's a tip: when using ipipgo's API to get a new IP, remember to add aGeographic switching parameters. For example, if you were blocked with a US IP before, change to a German IP next time so that the target site thinks it is a different user.

import requests
def get_new_ip(country='us'):
    api_url = f "https://api.ipipgo.com/getip?country={country}&type=dynamic"
    return requests.get(api_url).json()['ip']

Practical QA triple question

Q: What should I do if my IP is always blocked?
A: Check whether the request frequency is too high, we suggest setting 3-5 seconds interval for dynamic IP and extending the interval to 10 seconds for static IP. ipipgo's enterprise version dynamic package comes with intelligent frequency adjustment.

Q: Which package is the best deal to choose?
A: Dynamic residential (standard) is sufficient for small and medium-sized projects, and enterprise version for large data volume. Businesses that require fixed identification (such as maintaining login status) must use static residential IP.

Q: API IP extraction always fails?
A: Check the whitelist setting, the server IP should be added to the authorization list of ipipgo backend. If it is local debugging, test the connectivity with client mode first.

Why do you recommend ipipgo?

Real life experience of having used it in my own home:

• There's a cold country's acquisition needs that no one else can handle, and his family actually has the local operator's residential IPs
• Had a problem with customer service at 3am and it was resolved in 10 minutes (I guess it's a 24 hour shift)
• The key is price transparency, unlike some platforms that hide surcharges

Special mention of theirTK LineThe friends who are doing cross-border e-commerce use it and say it is stable. But ordinary crawler project with regular package is enough, do not spend money.

Lastly, don't try to buy a junk IP cheaply, you'll lose more if it's blocked. Regular proxy IP should be like ipipgo so clearly marked price, more than 7 yuan 1G package to do the test enough to run through and then upgrade the package.