The editor will share with you why python crawlers need proxy IP. I hope everyone will gain something after reading this article. Let’s discuss it together!
What is Python mainly used for?
Python is mainly used in: 1. Web development; 2. Data science research; 3. Web crawlers; 4. Embedded application development; 5. Game development; 6. Desktop application development.
In fact, a crawler is also a user who visits a web page, but it is a special user. So some people can use it without a proxy IP, but the server generally does not like such special users, and always uses various methods to find and ban such users. The most common method is to determine the visitor's access frequency.
Why is this? Since ordinary users do not access web pages very quickly, if the search engine finds that a certain IP's access speed is too fast or too high, the IP will be temporarily banned.
Users can certainly choose to reduce the access frequency to avoid being discovered by the server. However, if your crawler has similar access frequency and access logic to ordinary users, then your crawler will be meaningless.
Reptiles all hope that their reptiles can crawl a large amount of data as quickly as possible and update the data regularly. Of course, reptiles know that they should set the crawling frequency within a reasonable range to reduce the pressure on the target server and not show off. You should know that there is no absolutely effective method for crawling and anti-crawling. They often maintain a subtle tacit understanding and will not kill them all. You and others will do the same, but this is another way.
Therefore, the more commonly used method of crawling data is to use proxy IP, break through the server's anti-crawler mechanism, and continue to crawl at a high frequency. One of the ideas is that our adsl dial-up will get a new IP after the normal disconnection and redialing, so that adsl can reconnect after a period of time, get a new IP, and then continue to crawl, but there is a problem, the dial-up redialing must be completed after a period of time, so our program will be interrupted, so users with conditions can prepare several adsl servers as proxies, and then the crawler will run on another server that is not connected to the network. Of course, this use is too troublesome for big data crawling, so there are many third-party professional proxies, through convenient and fast proxy IP software, to obtain a large amount of IP usage, and generally better proxies will also optimize strategies for ordinary businesses such as adsl, so that your chance of being blocked will be reduced. If you are a crawler with a large amount of data, then using a proxy IP is basically essential.
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