How to find the $cdc_ (chromedriver params) in website?

Question

About this post: Can a website detect when you are using selenium with chromedriver?

Some website could detect chromedriver using $cdc_xxxxxxxxxx. 

I have ever found this parameter on website through Chrome DevTools (maybe document,network,etc.) when I used selenium to open browser.

But I forgot where it appeared.

I want to know how the website get this parameters of chromedriver?

Answer 1

The question Can a website detect when you are using selenium with chromedriver? doesn't mentions about $cdc_xxxxxxxxxx anyway. However there are a couple of answers which does refers to $cdc_xxxxxxxxxx

From the answers referring to $cdc_xxxxxxxxxx it is quite apperant it is a variable within ChromeDriver executable code and Chromium / ChromeDriver team will be in the best position to answer about the usage of this variable.

---

Selenium perspective

As far as Selenium is concerned:

• Selenium automates browsers. That's it!
• What you do with that power is entirely up to you.

Finally, I would recommend you, instead of looking into the $cdc_xxxxxxxxxx variable you can look at some other aspects like, the user-agent or the Navigator interface. You can find a couple of relevant discussions in:

• Can a website detect when you are using selenium with chromedriver?
• Selenium webdriver: Modifying navigator.webdriver flag to prevent selenium detection

Answer 2

That is quite simple.

function getCDC(){ 
    let matches = []
    for(let prop in window) {
       prop.match(/cdc_[a-z0-9]/ig) && matches.push(prop)
    }
    return matches 
}