How to set a custom name for the user-agent using Selenium and Python

Question

I am using selenium + webdriver and trying testing different user agents. I am adding user agent like this for Chrome on Windows for example:

option = Options()
option.add_argument("user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36")

Now when I log see login details it says Windows Chrome but when I want to rename it to something else like this:

option.add_argument("user-agent=test-user-agent")

or

option.add_argument("user-agent=Mozilla/5.0 (test-user-agent NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36")

Some websites display it as unknown or browser not supported

Is there a way to "rename" user-agent or create custom one or there is only preset number of them that websites know?

Here is a massive list of user-agent strings you can use: useragentstring.com/pages/useragentstring.php — Aero Blue
– Aero Blue, Commented Jun 21, 2020 at 17:46

undetected Selenium · Accepted Answer · 2020-06-21 18:39:36Z

User-Agent

The User-Agent request header is a characteristic string that lets servers and network peers identify the application, operating system, vendor, and/or version of the requesting user agent.

Syntax

The common format for web browsers is as follows:

User-Agent: Mozilla/5.0 (<system-information>) <platform> (<platform-details>) <extensions>

This usecase

While your first code attempt to add a specific user-agent would work perfect:

Code Block:

from selenium import webdriver

options = webdriver.ChromeOptions()
options.add_argument("user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36")
driver = webdriver.Chrome(options=options, executable_path=r'C:\WebDrivers\chromedriver.exe')
print(driver.execute_script("return navigator.userAgent;"))

Console Output:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36

But as per your second attempt you can't rename the User-Agent as it violates the prescribed format/syntax.

However, you can always change the User-Agent using the execute_cdp_cmd(cmd, cmd_args) as follows:

Code Block:

from selenium import webdriver

options = webdriver.ChromeOptions()
options.add_argument("user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36")
driver = webdriver.Chrome(options=options, executable_path=r'C:\WebDrivers\chromedriver.exe')
print(driver.execute_script("return navigator.userAgent;"))
# Setting UserAgent as Chrome/83.0.4103.97
driver.execute_cdp_cmd('Network.setUserAgentOverride', {"userAgent": 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36'})
print(driver.execute_script("return navigator.userAgent;"))

Console Output:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36

References

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