How do websites stop robots

In order to prevent robots from accessing websites, webmasters can adopt various strategies and technologies. Here are some common methods:

User-Agent detection: By checking the User-Agent field in the request header, the website can identify non-browser access requests, such as crawler programs.

Verification code: Using verification code technology, such as slider verification and character verification code, can effectively prevent automated programs.

IP Blocking: By monitoring and blocking frequently requested IP addresses, robots can be prevented from accessing.

Request frequency limit: limit the frequency of requests from the same IP or user to prevent crawlers from visiting the website too frequently.

Dynamic page generation: Use JavaScript to dynamically generate page content, which makes it difficult for crawler to grab.

Browser fingerprint detection: Collect the detailed information of the user's browser, such as screen resolution and installed fonts, and create a unique browser configuration file to identify automated scripts.

Behavior analysis: analyze the user's behavior patterns, such as page scrolling, clicking, access time, etc., to identify non-human behaviors.

Robots.txt file: Set the robots.txt file in the root directory of the website to tell the search engine which pages should not be crawled.

Use CDP protocol: Automation tools based on Chrome DevTools Protocol (CDP), such as DrissionPage, can simulate the behavior of human users, thus reducing the possibility of being detected.

Use proxy: By using proxy server, the real IP address can be hidden and IP can be prevented from being blocked.

Modify the WebDriver property: In the case of using automated testing tools such as Selenium, the detected risk can be reduced by modifying the WebDriver property. Use professional anti-climbing tools, such as WAF-BOT behavior management function of Tencent Cloud, to provide various means to deal with BOT behavior.

Set access frequency limit: By setting access frequency limit, you can limit the number and frequency of visits to websites by some IP addresses, and effectively prevent robots from maliciously attacking and collecting websites.

Update the website content regularly: By updating the website content regularly, it can effectively prevent the robot from maliciously attacking and collecting the website and improve the user experience of the website.

These methods can be used alone or in combination to improve the protection effect. However, it should be noted that some methods may affect the access experience of normal users, so the advantages and disadvantages should be weighed when implementing them.