Free proxy IP harvesting script development tutorial (with GitHub source code)

Teach you to build a free proxy IP collection tool!

Internet data collection often encounters access frequency limitations, which requires proxy IPs to solve the problem. Although the paid services on the market are stable, many developers prefer to test their needs through free resources. Today we will use Python to develop a practical script that can automatically collect and verify proxy IP.

Core Principles of Capture Scripts

The entire tool contains three core modules:web crawlerResponsible for crawling IP lists from publicly available websites.validatorFiltering available IPs through connection tests.scheduleris then responsible for maintaining the IP pool up to date. Here's a key point:Free IPs usually stay alive for less than 30 minutesThe timed refresh mechanism needs to be set up as a result.

Key Steps in Code Implementation

The core code snippet is given here (see the GitHub repository at the end of the article for the full source code):

 Example of a proxy validation function
def check_proxy(ip, port)::
    try.
        proxies = {'http': f'http://{ip}:{port}'}
        response = requests.get('http://httpbin.org/ip',
                             proxies=proxies, timeout=5)
        return response.status_code == 200
    except.
        return False

Attention:It is recommended to use asynchronous authentication in the actual development, ordinary synchronous requests will significantly slow down when encountering a large number of IP. You can introduce the aiohttp library to achieve concurrent detection.

Optimization Strategies for Free Solutions

According to the measured data, the average availability of free IPs is less than 151 TP3T. want to improve the success rate, you can try:

1. Mix of multiple source sites (at least 5 different platforms recommended)
2. Setting up automatic replenishment during the early morning hours (when the network is less stressed)
3. Create geographic priority queues (assign IP regions based on business needs)

For enterprise-level users who need stable service, it is recommended to access theipipgo professional agency services. Its residential IP covers more than 240 regions around the world, supports socks5/http/https all protocols, and the dynamic IP pool automatic maintenance mechanism can avoid the trouble of manual maintenance.

Frequently Asked Questions

Q: What should I do if the free proxy often times out the connection?
A: This is a normal phenomenon, it is recommended to set up a three-level timeout mechanism: 1 second for DNS query, 2 seconds to establish a connection, and 3 seconds for overall response.

Q: How to prevent the collector from being blocked by the target website?
A: In addition to the use of proxy IP, but also pay attention to: 1. Random generation of User-Agent 2. Set 1-3 seconds random request interval 3. Regularly change the export IP

Q: How do I choose when I need a large number of high stash agents?
A: ipipgo's residential IP comes with end-device level anonymity, and the request header will show up as real home broadband information, making it more difficult to be identified than regular data center proxies.

Project Source Code and Advice on Advancement

The complete code has been uploaded to GitHub (search for "proxy-harvester-tool"), including the auto-update module and the visual monitoring panel. For long term stability, the validation module can be interfaced to theAPI interface for ipipgoTheir IP availability is guaranteed to be above 99%, which is especially suitable for scenarios that require business-grade stability.

Final note: Free resources are suitable for personal testing and small-scale use when business grows to the point where it needs to beMore than 5000 requests per dayWhen it comes to cost-effectiveness, professional agency services are more advantageous - after all, the cost of time and technical maintenance are also important considerations.