


QueryList proxy settings are invalid and crawler recognition: How to effectively bypass the website anti-crawler mechanism?
Mar 31, 2025 pm 11:21 PMAnalysis of QueryList proxy settings failure and crawler identification problems
When many users use the QueryList library to crawl websites such as 58.com, they will encounter situations where the proxy parameter proxy is still recognized as a crawler by the website even if it is set. This article will explore in-depth the possible causes and solutions to this problem.
After setting the proxy parameters of QueryList, the user still received a prompt that "The system has detected that you are suspected of using web crawler tools to access this website." First, we need to verify whether the proxy parameter is actually effective. A simple test method is to deliberately fill in an incorrect proxy address, for example http://192.168.1.1:2666. If you can still access the target website at this time, it means that QueryList does not use the proxy we set, and the proxy parameter setting is invalid; otherwise, it means that the proxy parameter setting is valid, and the problem lies in other aspects. It should be noted that the official documentation of QueryList has clearly stated that the proxy parameter is valid.
So, even if the proxy parameters are valid, why are crawlers still recognized? One of the main reasons is the anti-crawler mechanism of the website. Many websites use JavaScript to generate cookies or other information dynamically, while crawler tools such as QueryList based on request library do not execute JavaScript code. Therefore, even if a proxy is used, the website can still identify crawler requests based on missing cookies or other features.
A viable solution for this situation is to use a headless browser. Headless browsers can simulate the behavior of real browsers, including executing JavaScript code, thereby obtaining complete web page content and cookies, reducing the risk of being identified. However, it is necessary to realize that although headless browsers can better simulate user behavior, they are relatively inefficient and consume more resources. In addition, some high-level anti-crawler mechanisms may also identify the characteristics of headless browsers.
The above is the detailed content of QueryList proxy settings are invalid and crawler recognition: How to effectively bypass the website anti-crawler mechanism?. For more information, please follow other related articles on the PHP Chinese website!

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