Can Websites Detect Selenium and ChromeDriver Usage, and How Can It Be Prevented?

Can a Website Detect When Using Selenium with ChromeDriver?

Introduction

In the world of automated web testing, Selenium has become a popular tool. However, certain websites have developed detection mechanisms to identify Selenium usage, raising concerns among testers.

Detecting Selenium Usage with JavaScript

Many websites employ JavaScript scripts that inspect pre-defined variables, such as $cdc_ and $wdc_, to detect the presence of Selenium. These variables may appear within various document or window objects depending on the browser used.

Circumventing Detection

One method of circumventing Selenium detection involves modifying the source code of the ChromeDriver to remove or rename these flagged variables. For instance, as mentioned in the provided answer, modifying the call_function.js file and changing the key $cdc_ to a different name may help.

Other Detection Techniques

In addition to variable checks, websites may employ more advanced detection techniques such as:

• Browser fingerprint analysis: Websites can create unique browser fingerprints based on a combination of configuration settings, plugins, and hardware characteristics. Discrepancies between the stored fingerprint and the fingerprint of an automated browser may raise suspicion.
• Execution timing: Automated scripts may exhibit specific timing patterns that differ from human interactions. Websites can detect if requests are being executed too quickly or with unnatural precision.
• Request headers: Some websites analyze incoming HTTP request headers for potential clues to automation. Headers containing 'webdriver' or other suspicious keywords may trigger detection.

Conclusion

While Selenium can be a powerful tool, it's important to be aware of the potential for detection. By understanding the techniques websites use and implementing appropriate countermeasures, testers can improve the stealth of their automated scripts and minimize the risk of detection.

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