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This article mainly introduces how to use http agent to improve efficiency when the crawler is inefficient, it has a certain reference value, interested friends can refer to it, I hope you can learn a lot after reading this article, let the editor take you to know it.

First, the crawler's requirements for the staff.

1. Analyze the data module of the target site: when we determine the site to crawl, we should first analyze the data module of the target site, which can analyze the secondary and tertiary levels under each section in detail.

two。 Analyze the anti-crawler strategy of the target site: you need to keep trying, such as how many times IP traffic will be triggered, how many times it will be triggered in a short period of time, and other aspects such as CAPTCHA, cookies and so on.

Second, the requirements of the crawler to the agent IP.

1. Choice of proxy IP: anonymous proxy IP needs to be selected. This kind of proxy IP has good quality and high availability, which can ensure that the anti-crawling mechanism of the website is not easy to trigger and not easy to waste time. It must be mentioned here that Sun http proxy millions of ultra-stable IP high-hidden IP resources, which is the best choice for you to use proxy IP to crawl.

two。 Control access frequency: when using proxy IP to grab data, it is best to control the access frequency. The high frequency of access can easily lead to the blocking of IP, which can not be fully applied to IP. If you don't know the maximum allowed access frequency, you can test the target site first.

Third, the reptile requires the quantity of IP. As long as you use the appropriate proxy IP, you can ensure that the web crawler is more effective.

Through how much data you need to get, you can get a rough idea of how many pages you need to visit; through the anti-crawling strategy of the target site, you can roughly understand how many proxy IP and how many proxy IP pools are needed.

Thank you for reading this article carefully. I hope the article "how to use http Agent to improve efficiency when the crawler is inefficient" shared by the editor will be helpful to everyone. At the same time, I hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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