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

This article mainly introduces what skills python crawler has, which can be used for reference by interested friends. I hope you can learn a lot after reading this article. Let's take a look at it.

1. Set up cookies. In fact, cookie is some encrypted data stored in the user terminal.

Some websites identify users through cookies. If a visitor sends requests frequently, it may be noticed by the site and suspected of being a crawler. At this point, the site can find visitors and deny access through cookie.

There are two ways to solve this problem. One is to customize the cookie policy to prevent cookierejected problems, and the other is to prohibit cookies.

2. Modify IP. In fact, Weibo recognizes IP, not an account.

In other words, simulated login is meaningless when you need to get a large amount of data continuously. As long as it is the same IP, no matter how to change the account is useless. The key is the IP address.

One of the strategies for a website to deal with crawlers is to directly close the IP or the entire IP segment and prohibit access. After closing IP, switch to another IP to continue access, you need to use the proxy IP.

There are many ways to obtain an IP address, and the most common one is to get a large amount of high-quality IP from a proxy IP website. Such as Sun HTTP such as the application of IDC five-star operating standards, SLA99.99%,AES encryption online data technology, self-owned servers all over the country, is a good choice.

3. Modify User-Agent.

User-Agent is a string that contains browser information, operating system information, etc.

Also known as a special network protocol. The server determines whether the current access object is a browser, mail client, or web crawler.

The specific method is to change the value of User-Agent to browsers, or even set up a User-Agent pool (list, array, dictionary), store multiple browsers, crawl a User-Agent setting request each time, so that the User-Agent is constantly changing to prevent it from being shielded.

Thank you for reading this article carefully. I hope the article "what are the skills in python crawlers" shared by the editor will be helpful to you? at the same time, I also 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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