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Precautions and anti-crawling strategies when using dynamic residential IP for data crawling
by Sun
2024-01-22

With the development and popularity of the Internet, web crawlers have become an indispensable part of many websites and applications. Through web crawlers, we can crawl a large amount of data from the Internet, thereby helping us make more accurate decisions and analysis.


However, with the continuous upgrading of anti-crawler technology, it has become increasingly difficult to use static IP to crawl data. Therefore, more and more people are starting to use dynamic residential IPs for data scraping. 


However, using dynamic residential IPs for data scraping is not without risks. In order to avoid being identified and blocked by anti-crawling technology, we need to pay attention to some things and adopt some anti-crawling strategies.


1. Things to note


Avoid frequent crawling


When using dynamic residential IP for data scraping, the most important point is to avoid frequent scraping. Frequent crawling will put huge pressure on the website server, thus triggering the vigilance of anti-crawling technology. 


Therefore, when setting up a crawler program, be sure to set a reasonable crawl interval to avoid requesting the website too frequently.


Simulate human operation


In order to avoid being recognized by anti-crawler technology, we need to simulate human operations as much as possible. This includes randomly generating crawl intervals, randomly clicking pages, randomly scrolling pages, etc. 


At the same time, you also need to pay attention to maintaining the diversity of request headers and avoid using the same User-proxy and Cookie for crawling.


Use multiple IP addresses


When using dynamic residential IPs for data scraping, it is best to use multiple IP addresses. This avoids being unable to continue crawling data after an IP address is blocked. 


At the same time, you can also adopt an IP rotation strategy and use different IP addresses to capture data, thereby reducing the risk of being identified by anti-crawler technology.


Avoid crawling too much data


When doing data capture, be sure to pay attention to the amount of data captured. If you crawl too much data, it will not only put pressure on the website server, but also increase the risk of being identified by anti-crawler technology. 


Therefore, when setting up a crawler program, be sure to control the amount of data captured to avoid excessive crawling.


Update your IP address promptly


Since dynamic residential IP is unstable, the IP address needs to be updated in time when used. If an expired IP address is used for data scraping, it can be easily identified and blocked by anti-crawler technology. 


Therefore, it is recommended to change the IP address regularly to ensure the smooth progress of data capture.


2. Anti-climbing strategy


Use a proxy server


Using a proxy server is one of the most commonly used anti-crawling strategies. By using a proxy server, you can hide your real IP address and avoid being identified by anti-crawler technology. 


At the same time, the proxy server can also provide multiple IP addresses to facilitate IP rotation, thus reducing the risk of being banned.


Use verification code recognition technology


Some websites will set verification codes to prevent data from being captured by crawlers. If our crawler cannot recognize the verification code, it will not be able to continue crawling data. 


Therefore, verification code recognition technology can be used to solve this problem. By using third-party tools or writing your own CAPTCHA recognition program, you can effectively identify the CAPTCHA and continue to scrape data.


Use distributed crawlers


Distributed crawler refers to dividing a large crawler program into multiple small programs, running on different computers, and communicating and coordinating through the network. 


By using distributed crawlers, the risk of being identified by anti-crawler technology can be effectively reduced. Because each small program is only responsible for crawling a part of the data, it will not put huge pressure on the website server.


Use obfuscation techniques


Obfuscation technology refers to making some modifications to the crawler program to make it difficult to be recognized by anti-crawler technology. For example, a crawler's code can be obfuscated to make it difficult to understand and thus avoid being identified by anti-crawling techniques. 


At the same time, you can also make some modifications to the request headers of the crawler program to make it look more like human operation.


Use anti-anti-crawler technology


With the continuous upgrading of anti-crawler technology, some anti-crawler technologies have emerged. These technologies can help us identify and bypass anti-crawler technologies to successfully crawl data. 


For example, you can use an IP pool to dynamically obtain available IP addresses, or use some anti-anti-crawler frameworks to help us build a more stable and efficient crawler program.


In general, when using dynamic residential IP for data capture, we need to pay attention to avoid frequent crawling, simulate human operations, use multiple IP addresses, control the amount of captured data, and update IP addresses in a timely manner, and adopt proxy servers. 


Verification code identification technology, distributed crawler, obfuscation technology and anti-anti-crawler technology and other anti-crawling strategies to ensure the smooth progress of data capture.


At the same time, we should also abide by Internet ethics, use crawler technology rationally, and avoid placing excessive burden on the website server. 


Only by complying with relevant regulations can we better utilize dynamic residential IPs for data capture and provide more accurate data support for our work and research.


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