Python crawler proxy pool building tutorial | Dynamic IP automatic switching program

In the crawler combat, have you encountered the website frequently blocked IP trouble? In this article, we will teach you how to build an efficient proxy pool and combine it with theipipgo Dynamic Residential IP ServiceImplement smart switching to keep the crawlers running consistently and steadily.

I. Why do I need an agent pool?

Take an e-commerce platform as an example, when the same IP is accessed more than 30 times per minute it will trigger the CAPTCHA [3](@ref). The traditional single-IP model leads to frequent interruptions of the collection task, and the proxy pool solves the problem by the following mechanism:

• Multi-IP rotation: spreading the request pressure
• Failure Auto Rejection: Maintaining IP Availability
• Intelligent scheduling: allocating resources according to business needs

Second, four steps to build the basic agent pool

Step 1: Obtain a proxy IP source
Recommendedipipgo Dynamic IP ServiceAPI interface, no need to crawl free IPs by yourself (low survival rate). You can get verified high-quality IPs directly through the official SDK:

import requests def get_ipipgo_proxy(): api_url = "https://api.ipipgo.com/dynamic?token=YOUR_TOKEN" return requests.get(api_url).json()[' proxy']

Step 2: Establishment of a storage system
Storing IPs using Redis ordered collections, sorted by responsiveness score [3] (@ref):

Step 3: Timed validation mechanism
Checks IP availability every 15 minutes and automatically rejects failed nodes:

def check_proxy(proxy): try: resp = requests.get('https://www.baidu.com', proxies={'http':proxy, 'https':proxy}, timeout=3) return resp. status_code == 200 except: return False

Step 4: Dynamic Scheduling Strategy
Recommendedweighted randomization algorithmThe IP is a fast-responding IP that is prioritized for use byipipgo Intelligent Dispatch InterfaceOptimized IP sequences can be obtained directly.

Dynamic IP switching program

Automatic switching via middleware in the Scrapy framework [3](@ref):

class DynamicProxyMiddleware: def process_request(self, request, spider): request.meta['proxy'] = get_ipgo_proxy()

 def process_response(self, request, response, spider): if response.
    if response.status in [403, 429]: self.retry_request(self, request, response, spider).
        self.retry_request(request): if response.status in [403, 429].

Key configuration parameters:

• Number of concurrency: no more than 20 times/minute for a single IP
• Timeout: 5-8 seconds recommended
• Failure to retry: three-level fault-tolerance mechanism (immediate switchover → delayed retry → mark failure)

Fourth, enterprise-level program recommended: ipipgo dynamic residential IP

Self-built agent pools are more expensive to maintain and are recommended to useipipgo off-the-shelf solutions, with three core strengths:

Measured data show that the use ofipipgo Dynamic Residential IPAfterward, the collection success rate of a financial data platform increased from 581 TP3T to 961 TP3T, and the response rate decreased by 401 TP3T [3](@ref).

V. Frequently Asked Questions (QA)

Q: What should I do if my proxy IP suddenly fails?
A: Recommended to be turned onipipgo automatic culling mechanismWhen IP failure is detected: ① Immediately switch the backup IP ② Join the failure queue ③ Trigger real-time update

Q: How to test the actual effect of the agent?
A: Use the two-step verification method:
1. Basic testing:curl -x http://proxy_ip:port https://httpbin.org/ip
2. Business simulation: testing the target website response with real requests

Q: How to choose between Dynamic IP and Static IP?
A: High-frequency collection of selected dynamic IP (recommended ipipgo dynamic residential IP), long-term login scenarios with static IP (recommended ipipgo long-lasting static IP).

With the solution in this article, you can quickly build a proxy system that handles millions of requests per day. For organizations that need to go live quickly, theipipgo offers a free trialIt supports HTTP/HTTPS/Socks5 full protocol access and covers IP resources in 240+ countries and regions around the world. Click on the official website to register to get free call credits, and immediately experience the efficiency improvement brought by intelligent IP switching!