Shulou(Shulou.com)06/03 Report--

This article mainly explains "the basic working principle of proxy server". The content of the explanation is simple and clear, and it is easy to learn and understand. let's follow the editor's train of thought to study and learn the basic working principle of proxy server.

Crawler workers often encounter this situation when trying crawlers to collect data. At first, the crawler ran normally and the data was captured in an orderly manner. However, if it is clear at a glance, it can go wrong, such as 403Forbidden. At this point, if you open the web page, the web page will prompt you that your IP is accessed too frequently.

The reason for this phenomenon is that the visited websites adopt an anti-crawler mechanism. For example, the server detects the number of requests for an IP per unit time. If this threshold is exceeded, the service will be directly denied and an error message will be returned. This is called sealed IP.

So the solution to this problem is simple. Since he can detect the number of requests from an IP, it is best to disguise his IP address with the help of a proxy IP to prevent IP from being blocked.

Then learn the basic principles of the proxy IP and see how the proxy IP is camouflaged.

Agent is actually a proxy server, and the function of proxy IP is to represent network customers to obtain network information. It is equivalent to a transit station for network information. When a website is normally requested by us, it will send a request to the web server, and the web server will send us a response.

If a proxy server is set up in the middle, it actually sets up a bridge between the machine and the visited website. At this time, the machine does not make a request directly to the network server, but to the proxy server, and the request will be sent to the proxy server, and then the proxy server will send it to the network server. the proxy server then forwards the response returned to the network server to the machine. Therefore, we can also visit the web page normally, but in the process, the real IP recognized by the web server is no longer the IP of our machine, but the successful implementation of IP camouflage. This is the basic principle of agency.

Thank you for your reading. the above is the content of "the basic working principle of proxy server". After the study of this article, I believe you have a deeper understanding of the basic working principle of proxy server. the specific use of the situation also needs to be verified by practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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