Chrome (version 72+):

1. Bring up the developer tools using one of these methods:
   • Keyboard shortcut:
     • Windows: F12
     • OS X: ⌘⌥I
     • Linux: Ctrl + Shift + I
   • Chrome menu:
     1. Click ⋮ in the top-right of your browser window.
     2. Select "More tools".
     3. Select "Developer tools".
2. Navigate to the Network tab in developer tools.
3. Check the Disable Cache option to prevent caching of resources for this page.
4. Check the Preserve Log option to keep the logs when the browser navigates to a new page.
5. Ensure the tool is recording by examining the circle in the upper-left corner.
   • ​If it is red, it is recording.
   • If it is black, click the circle to begin recording.
6. Refresh the page to start capturing the traffic between the browser and the server.
   • Please capture a full page load so you can see the requests made prior to the problem you're analyzing.
7. Complete the steps that trigger or demonstrate your issue.
8. Right click in the data table and select "Save all as HAR with content".
   

Firefox (version 60+):

1. Bring up the developer tools using one of these methods:
   • Keyboard shortcut:
     • Windows: Ctrl + Shift + E
     • OS X: Cmd + Opt + E
     • Linux: Ctrl + Shift + E
   • Firefox menu:
     1. Click ≡ in the top-right corner of the browser.
     2. Select "Web Developer".
     3. Select "Network".
2. Check the "Disable cache" option to prevent caching of resources for this specific page.
3. Check the "Persist Logs" option to keep the gathered log when the browser navigates to a new page.
4. Ensure the tool is recording by examining the icon in the upper-left corner.
   • ​If it is two vertical lines (the Pause symbol), it is recording.
   • If it is a blue right-facing arrowhead (the Play symbol), click it to begin recording.
5. Refresh the page to start capturing the traffic between the browser and the server.
   • ​Please capture a full page load so you can see the requests made prior to the problem you're analyzing.
6. Complete the steps that trigger or demonstrate your issue.
7. Right click in the data table and select "Save All As HAR".
   

Edge:

See detailed instructions on the Microsoft Site.

1. Open the Network tool in developer tools by pressing F12.
2. Reproduce the issue.
3. Export captured traffic as a HAR (Ctrl + S).

Internet Explorer:

You will need to use: HTTPWatch

1. Download and install HTTPWatch.
2. Start the HTTPWatch capture right before reproducing the behavior you want to capture.
3. Stop the HTTPWatch capture right after reproducing the behavior.
4. Export the capture in HAR format.