How python crawlers add IP pools

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1. Find a free ip proxy website

2. Crawl ip

3. Verify the validity of ip

4. Record ip (write to document)

While the method of adding an IP pool after obtaining IP from the free agent ip is useful, the free ip is not operated and maintained by the team, and the security, stability, and availability of ip are low. Every time you get ip, you need third-party software to detect it, which will affect the efficiency. Free ip is not recommended.

So now many proxy servers should be born from time to time, basically can provide ip proxy services, the difference is the price and effect. For a crawler, using a proxy IP is a shortcut, and when an IP is blocked, you can continue to access it by changing the IP.

With the vigorous development of the Internet, the demand of the web crawler industry is increasing, and more and more people learn crawlers. However, when our crawlers collect data, we often encounter obstacles of various website anti-crawler mechanisms. The most common is to restrict according to the frequency of access to ip. Due to the amount and speed of information collection, the target website will bear a huge load. This triggers an anti-crawler mechanism that forbids or restricts access to ip.

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