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

This article introduces the relevant knowledge of "what to do if the web crawler IP is blocked". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

I. High Anonymous Agent

In order to break through the anti-crawler mechanism of the website, it is necessary to agent ip and visit it many times by means of IP exchange. Using multithreading also requires a lot of IP and using highly anonymous proxies, otherwise you will be detected by the target site that you are using proxy IP and reveal your real IP, which will definitely block IP. If the use of a highly anonymous agent is different, the other party does not notice.

Second, multi-thread collection: collect data and want to collect more data as soon as possible. Otherwise, a lot of work will be collected one by one, and it will take time.

For example, it can be collected every few seconds, so it can be collected about 10 times per minute, and more than 10000 pages can be collected every day. If it is a small site is not bad, but the large site tens of millions of pages how to do, at this speed to collect it takes a lot of time. It is recommended to collect a large amount of data. Multithreading can be used to complete multiple tasks synchronously. Each thread collects different tasks and increases the amount of collection.

III. Time interval access

As for the time interval of collection, you can first test the maximum access frequency allowed by the target website. The closer the access frequency is to the maximum, the easier it is to seal the IP. It is necessary to set a reasonable time interval, which can not only achieve the acquisition speed, but also be free from the restriction of IP. How does a crawler prevent a website from sealing IP? Even with the aid of multi-thread collection and high anonymous agent, it is necessary to control the access speed of the crawler, thus greatly reducing the probability of sealing the IP of the website.

If you want to successfully collect crawler data, you must first break through the site's anti-crawler mechanism to prevent the risk of ip being limited. This can improve the efficiency of the crawler.

This is the end of the content of "what to do if the web crawler IP is blocked". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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