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How to Capture a HAR File

Learn how to generate a HAR (HTTP Archive) file to help us investigate storefront issues. This guide covers capturing network activity, exporting the HAR file, and optionally sanitising it before securely sharing it with our support team.

Written by Max K.

A HAR (HTTP Archive) file records the network activity between your browser and the storefront. It helps us investigate issues such as pages not loading correctly, failed requests, slow performance, or unexpected behaviour.


Before you begin

  • Open a new Private/Incognito window if possible.

  • Disable browser extensions, particularly ad blockers or privacy extensions, if you can.

  • Be ready to reproduce the issue before starting the recording.

Step 1: Open your browser’s Developer Tools

Use one of the following methods:

  • Chrome / Edge / Firefox: Press F12, or Ctrl + Shift + I (Windows/Linux) or Cmd + Option + I (Mac).

  • Safari: If you don’t already have the Develop menu enabled, go to Safari → Settings → Advanced and enable Show Develop menu in menu bar. Then choose Develop → Show Web Inspector.

Step 2: Open the Network tab

In the Developer Tools or Web Inspector, select the Network tab.

Step 3: Configure the recording

Before reproducing the issue:

  • Make sure network recording is enabled (the record button should be active/red).

  • Enable Preserve log or Persist Logs if available.

    • Chrome / Edge: Preserve log

    • Firefox: Persist Logs

    • Safari: Recording is generally enabled automatically; if a preserve option is available in your version, enable it.

  • Enable Disable cache while Developer Tools remain open (available in Chrome and Edge).

Step 4: Capture the issue

  1. Refresh the page.

  2. Reproduce the issue exactly as you experienced it.

  3. Once the issue has occurred, stop interacting with the page.

Step 5: Save the HAR file

Within the Network tab:

  • Chrome / Edge: Right-click anywhere in the request list and select Save all as HAR with content.

  • Firefox: Right-click in the request list and select Save All As HAR.

  • Safari: Use the export option available in the Network tab (the exact location varies slightly between Safari versions) to export the network log.

Step 6: Send us the following

Please include:

  • The HAR file

  • The URL where the issue occurred

  • The approximate date and time the issue happened (including your time zone)

  • Your browser and version

  • A brief description of:

    • what you expected to happen

    • what actually happened

  • A screenshot or screen recording, if available

Privacy notice

HAR files may contain sensitive information, including:

  • URLs visited

  • Cookies

  • Request and response headers

  • Form data submitted during the session

If possible, reproduce the issue using a test account rather than a production account.

If you would prefer to remove sensitive information before sharing the file, you can use Cloudflare’s HAR Sanitizer:


The tool sanitises HAR files using client-side processing, so the contents of your HAR file are not uploaded to Cloudflare during sanitisation. After sanitising the file, please send us the sanitised HAR instead. (HAR Sanitizer)

Note: In some cases, certain cookies or authentication headers may be required for troubleshooting. If the sanitised HAR doesn’t provide enough information, we’ll let you know exactly what additional data is needed.

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