How to Generate HAR Files – F5 Silverline Knowledge Base

What Happened?

This article describes how to generate HAR files on the most commonly used web browsers (Chrome, Firefox, Safari).

HAR files are used by the SOC because they provide detailed information about the web browser request
Generating and providing a HAR file to the SOC while the issue is ongoing is essential for faster resolution

From the Chrome menu bar select View > Developer > Developer Tools
Select the network tab from the Developer Tools panel
Click the Clear button ( )to remove any existing logs on the Network tab
Select the Preserve log checkbox
Select the Disable cache checkbox to prevent content from being loaded from the local cache
Click the round record button ( ) in the upper left corner of the panel to make sure it's red (recording). If the button is grey, click it once to start recording
Go to the page where the issue is occurring
Reproduce the issue that you were experiencing so the requests are recorded on the file
Once the issue has been reproduced, right-click on any of the requests on the panel, select Save as HAR with Content
Save the file to your computer
Upload the HAR file to the Secure Repository in the Portal

Select the Firefox menu ( ) at the top-right of the window
Select Web Developer > Network
Select the network tab from the Developer Network Tools panel
Click the clear icon ( ) to remove any existing logs on the Network tab
The recording starts when actions are performed in the browser
Go to the page where the issue is occurring
Reproduce the issue that you were experiencing so the requests are recorded on the file
Once the issue has been reproduced, right-click on any of the requests on the panel, select Save all as HAR
Save the file to your computer
Upload the HAR file to the Secure Repository in the Portal

Make sure the Develop menu is visible in Safari. If it's not available, follow the instructions on Use the developer tools in the Develop menu in Safari on Mac
Click on the Develop menu
Select Show Web Inspector
Select the Network tab
Click the Clear network items icon ( )
Select the Preserve log checkbox
Go to the page where the issue is occurring
Reproduce the issue that you were experiencing so the requests are recorded on the file
Click the Export ( ) button on the far right of the panel
Save the file to your computer
Upload the HAR file to the Secure Repository in the Portal

Select the Edge menu () at the top-right of the window
Select More Tools > Developer Tools
Select the Network tab from the Developer Network Tools panel ()
(optional) Click the Clear Session icon () to remove any existing logs on the Network tab unless it's greyed-out ()
Make sure the recording started ()
Go to the page where the issue is occurring
Reproduce the issue that you were experiencing so the requests are recorded on the file
Once the issue has been reproduced click the Export as HAR button ()
Save the file to your computer
Upload the HAR file to the Secure Repository in the Portal

Select the Gear menu () at the top-right of the window
Select F12 Developer Tools
Select the Network tab from the Developer Network Tools panel ()
(optional) Click the Clear Session icon () to remove any existing logs on the Network tab unless it's greyed-out ()
Make sure the recording started ()
Go to the page where the issue is occurring
Reproduce the issue that you were experiencing so the requests are recorded on the file
Once the issue has been reproduced click the Export as HAR button ()
Save the file to your computer
Upload the HAR file to the Secure Repository in the Portal