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This article mainly explains "the basic principle of reptile agent IP and what is the role of agent". The explanation in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian to study and learn "the basic principle of reptile agent IP and what is the role of agent" together.

Crawlers in the production process, often encounter such a situation, at the beginning of the crawler, the crawler is usually normal to grab data, but after a while will report errors, such as 403Forbidden, at this time open the web page to see, may find IP access rate is too high. The reason for this phenomenon is that the website has taken some anti-crawler measures. This method is to use agents, agents to use the method later, first to understand the basic principles of agents.

Rationale:

The client does not send requests directly to the Web server, but to the proxy server.

2, sent by the proxy server to the Web server, the proxy server and then the response returned to the server forwarded to the client.

In this way, we can access the web page normally, the IP identified by the network server is no longer our local IP, and the IP disguise is successfully implemented. Proxy actually refers to proxy server, its role is to proxy network users to obtain network information, this is easy for us to understand a diagram directly.

What is the role of the agent?

Break your own IP access restrictions and visit some websites that are usually inaccessible.

Access to the internal resources of a particular organization or group.

In order to improve the access speed, the proxy server usually sets up a large hard disk buffer. When external information passes through, it is stored in the buffer at the same time. When other users access the same information, they directly extract information from the buffer.

Hiding the real IP, for crawlers, using a proxy is to hide the IP and prevent it from being blocked.

So what can a crawler agent achieve?

For reptiles, because the crawler speed is too fast, the crawler may encounter the problem of accessing too much IP. At this time, the website will ask us to enter the Captcha to log in or block the IP directly. Use proxy to hide the real IP, so that the server mistakenly thinks that the proxy server needs itself, and constantly replace the proxy in the process of crawling, and will not be blocked, thus achieving our goal.

Thank you for reading, the above is the content of "the basic principle of crawler agent IP and what is the role of agent". After studying this article, I believe that everyone has a deeper understanding of the basic principle of crawler agent IP and what is the role of agent. The specific use situation still needs to be verified by practice. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!

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