What is the reason why Python crawlers are often blocked

This article introduces the relevant knowledge of "what is the reason why Python crawlers are often 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!

If you have been blocked by the site, but can not find the reason, then this article can help you. Today, the editor focuses on introducing to you the common reasons why web crawlers are blocked.

1. Check the JavaScript. If the page space or information is missing, it is likely to be due to the problem with the page created by the JavaScript site.

2. Check cookie. If you failed to log in and could not keep your login status, please check your cookie.

3. Encrypt the IP address.

If the page can not be opened, 403 forbidden access error, it is very likely that the IP address is blocked by the website, no longer accept any of your requests. You can wait for the IP address to be removed from the blacklist.

In addition to the above three points, when crawling page information by Python crawlers, we should also slow down as much as possible, too fast collection, not only easier to be blocked by anti-crawlers, but also bring a heavy burden to the website. Try to increase the latency for your crawlers to run at night, which is a network advantage.

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