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How to download a HAR file

This article explains how to capture and download a HAR file from your browser. Addo support may request this file to investigate technical issues by reviewing network activity between your browser and the Addo system.

Updated over a week ago

Sometimes we at Addo need a bit more technical information from your computer to help our developers understand and fix an issue. To do this, we may ask you to collect a HAR file - a simple log that shows what happens in your browser when the problem occurs. It doesn’t include any personal files, only technical data that helps us find the cause of the issue.

Below you’ll find an easy step-by-step guide on how to download a HAR file in the most common browsers. This works on both Windows and Mac.

Chrome

  1. Open the page where the issue occurs.

  2. Open DevTools: F12 or Ctrl+Shift+I

  3. Go to the Network tab.

  4. (Optional but recommended) Check Preserve log and Disable cache.

  5. Make sure recording is on (red ● in the top-left of the Network panel). If not, click it to start.

  6. Reproduce the problem so requests appear in the list.

  7. Right-click anywhere in the request list and choose Save all as HAR with content.

  8. Save the .har file.

Microsoft Edge

  1. Open the page.

  2. Open DevTools: F12 or Ctrl+Shift+I.

  3. Network tab → enable Preserve log and Disable cache (optional).

  4. Ensure recording is on (red ●).

  5. Reproduce the issue.

  6. Right-click in the request list → Save all as HAR with content.

  7. Save the .har file.

Firefox

  1. Open the page.

  2. Open Developer Tools: F12 or Ctrl+Shift+I.

  3. Click the Network tab.

  4. (Optional) Click the gear ⚙️ in the Network panel and enable Persist Logs and Disable Cache.

  5. Ensure recording is on (toggle button at top-left of the panel).

  6. Reproduce the issue.

  7. Right-click within the request list → Save All As HAR.

  8. Save the .har file.

Safari (macOS)

  1. Enable the Develop menu (one-time):

    • Safari → Settings/Preferences → Advanced → check “Show Develop menu in menu bar.”

  2. Open the page.

  3. Open Web Inspector: ⌥⌘I or Develop → Show Web Inspector.

  4. Go to the Network tab.

  5. (Optional) Click the gear in the Inspector and enable Disable Caches and Persist Logs.

  6. Make sure recording is active (red ●).

  7. Reproduce the issue.

  8. In the Network tab’s background area, right-click → Export HAR (or use the Export button if visible).

  9. Save the .har file.

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