How to generate a HAR file in Chrome
Start by opening Google Chrome.
In Chrome, go to the page within our application where you are experiencing trouble
Select the Chrome menu (⋮) at the top-right of your browser window, then select Tools > Developer Tools.
The Developer Tools will open as a docked panel at the side or bottom of Chrome. Click on the Network tab.
Select the option Preserve log (at the top of the panel)