How to Capture HAR file and Analyze

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Create and view HAR files in supported browsers

Chrome

1. Go to the page where you're experiencing slowness.
2. Press F12 on your keyboard.
3. Click the Network tab in the diagnostic window.
4. Click on the link/button/tab to have the problem page or action load in the main window.
5. After the page loads, you should see some information and graphs in the diagnostic window. If the slowness was seen during this page load, Right-click in the diagnostic window and Save as HAR with content.
6. If you need to preserve the logs for multiple page loads, there's a 'preserve log' checkbox below the tabs.
7. Press F12 to remove the diagnostic window.


Internet Explorer


1. Press F12 on the keyboard.
2. You should see a component appear on the bottom of the screen.
3. Go to the Network tab in this component and press the green triangle (Play button)
4. Reproduce the issue.
5. To save, click the red square (stop button.) Directly to the right you will see a disk icon with an arrow on it.
6. Click this icon and save it.
7. IE only offers options to export as an XML or CSV file. Either format is fine. CSV can be viewed via Excel and XML can be viewed by any tool that can read HTTP Archive files, such as the Chrome extension, 'HTTP Archive Viewer.'


View the HAR file log

1. Go to the HAR viewer.
2. Uncheck: Validate data before processing? (Otherwise, an error may occur.)
3. Drag the HAR file inside 'Preview' box.

 

Capture and debug network traffic with Fiddler