Generate an HAR File to Capture Browser Network Activity

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Updated:September 22, 2026
Document ID:224759

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Introduction

This doucment describes generating an HTTP Archive (HAR) file to caputure browser network activity.

Issue

When troubleshooting unexpected UI behavior, performance issues, or errors within the Cisco Umbrella dashboard, Support requires a detailed log of the network interactions between your browser and the server.

Environment

  • Product: Cisco Umbrella
  • Tools: Web Browsers (Chrome, Edge, Firefox, Safari)
  • Format: HTTP Archive (HAR) file
warning-icon

Warning: HAR files contain sensitive information, including page content and cookies. Anyone with access to a HAR file can impersonate your account and access all information submitted during the recording, such as personal details, passwords, or credit card numbers.

Prerequisites

  • Identify the specific steps required to reproduce the issue.
  • Ensure you have administrative rights to access browser developer tools.

Create a HAR File in Chrome

  1. Open Chrome.
  2. Navigate to Menu > More Tools > Developer tools.
  3. In the Developer Tools window, select the Network tab.
  4. Confirm that the record button is active and all types are displayed.
  5. If the issue involves multiple web pages or redirects, select the Preserve Log option to prevent log clearing.
  6. Reproduce the browser behavior that requires capturing.
  7. Click Export HAR to download the HAR file.
  8. Save the file as HAR with Content to your computer.
  9. Assign a file name and select a destination.
  10. Send this file to support.

Send File to Supportchrome_preserve_log.png

Create an HAR File in Edge or Internet Explorer

  1. Open Edge or Internet Explorer.
  2. Select the ... menu and then choose F12 Developer Tools.
  3. In the Developer Tools window, select the Network tab.
  4. Confirm that the play button is grey, indicating that data is being captured.
  5. If the issue involves multiple web pages or redirects, deselect Clear Entries on redirect to preserve the log.
  6. Reproduce the browser behavior that requires capturing.
  7. Click Export as HAR to save the file.
  8. Send this file to support.

Create an HAR File in Firefox

  1. Open Firefox.
  2. Navigate to Menu > Web Developer > Network or use Ctrl+Shift+E.
    Click NetworkFullscreen_2019-07-16__4_51_PM.png
  3. Reproduce the browser behavior that requires capturing.
  4. If the issue involves multiple web pages or redirects, select the Persist Logs option to retain all entries.
  5. Right-click within the grid and choose Save all as HAR.
    Save as an HARFullscreen_2019-07-16__4_55_PM.png
  6. Save the capture file.
  7. Send this file to support.

Create a HAR File in Safari

  1. Open Safari and navigate to the webpage in question.
  2. Enable the Develop menu:
    • Go to Safari > Preferences > Advanced.
    • Select Show Develop menu in menu bar.
      Select Show Development MenuScreen_Shot_2022-04-13_at_8.18.10_AM.png
  3. Select Develop > Show Web Inspector.
  4. In the Web Inspector window, select the Network tab.
    Select Network TabScreen_Shot_2022-04-13_at_8.21.41_AM.png
  5. Select the Preserve log option within the Network tab.
    Select Preserve LogScreen_Shot_2022-04-13_at_8.23.45_AM.png
  6. Load or reproduce the page behavior you need to capture.
  7. Click Export in the top right corner of the Network tab window.
    Click ExportScreen_Shot_2022-04-13_at_8.25.27_AM.png
  8. Save the HAR file.
  9. Send this file to support.

Revision History

Revision Publish Date Comments
2.0
22-Sep-2026
Recertification
1.0
04-Sep-2025
Initial Release
TAC Authored

Contributed by Cisco Engineers

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