You need a script in the client for that, aka javascript.
Maybe there is a marketplace module for that, but I don't know from my head. What you can do is execute a custom javascript action yourself.
https://www.webfx.com/blog/web-design/browser-detection-javascript/
Hi Harshraj,
You can use a JavaAction if you want to get the User-Agent using a microflow. Just fetch the User-Agent header from the request. I used Eclipse to test it:
I hope this is useful!
André