Because generally speaking, websites will set up some anti-crawling strategies to prevent their website information from being stolen for personal gain, or to prevent the server from crashing due to high-frequency and multiple visits.
Generally speaking, there are two common anti-crawl strategies, such as restricting access based on user IP, or identifying and blocking non-human requests based on request headers such as user-agent.
The anti-crawl mechanism for request headers can construct request headers by itself, and we can bypass the restrictions on user IP addresses by using dynamic proxy IP.
When the data collection business volume is very large, the efficiency of collecting data with only one device will be relatively low. The available IP is single, which can easily cause the IP to be blocked and the business cannot be carried out. At this time, we can use multiple IPs to implement multi-threaded collection and use distributed crawlers to improve our collection efficiency.
The resources of professional dynamic proxy IP suppliers are relatively pure, reducing the probability of being identified as a crawler by the target website due to IP reuse. They are also highly anonymous and safer to use, avoiding privacy leaks.
There are also some target websites that are only accessible in designated areas. When we need to obtain information from the website, we must use the local IP. At this time, we can use the proxy IP and select the designated IP source to achieve the purpose of smooth collection.
The above is why crawlers need to use dynamic IP
This article comes from online submissions and does not represent the analysis of kookeey. If you have any questions, please contact us
