--- title: How to Capture a HAR file description: How to capture HAR file for CyberNut Addon error. --- [Skip to content](https://knowledgebase.cybernut.com/cybernut-knowledge-base/capture-har-file#main-content) English Show submenu for translations [![Help Center Banner-2](https://knowledgebase.cybernut.com/hs-fs/hubfs/Help%20Center%20Banner-2.png?width=400&height=150&name=Help%20Center%20Banner-2.png)](https://knowledgebase.cybernut.com/cybernut-knowledge-base?hsLang=en) - [Home](https://www.cybernut.com/) - [Platform](https://www.cybernut.com/platform) - [Resources](https://www.cybernut.com/resources) Open main navigation Close main navigation - [Home](https://www.cybernut.com/) - [Platform](https://www.cybernut.com/platform) - [Resources](https://www.cybernut.com/resources) - English Show submenu for translations - [Contact Us](https://www.cybernut.com/contact) [Contact Us](https://www.cybernut.com/contact?hsLang=en) How can we help you? - There are no suggestions because the search field is empty. 1. [CyberNut Knowledge Base](https://knowledgebase.cybernut.com/cybernut-knowledge-base?hsLang=en) 2. [Troubleshooting/FAQs](https://knowledgebase.cybernut.com/cybernut-knowledge-base/troubleshooting-faqs?hsLang=en) October 1, 2026 # How to Capture a HAR file ## This article will explain how to capture browser trace information related to the CyberNut addon. [HAR](https://en.wikipedia.org/wiki/HAR_(file_format)) (HTTP Archive) is a file format used to record HTTP session data, which helps with troubleshooting HTTP issues. 1. Log in to Gmail and select the CyberNut addon. ![](https://knowledgebase.cybernut.com/hs-fs/hubfs/image-png-Oct-01-2026-07-50-07-1172-PM.png?width=1288&height=794&name=image-png-Oct-01-2026-07-50-07-1172-PM.png) 2. Right-click anywhere in the side panel and choose **Inspect**. ![](https://knowledgebase.cybernut.com/hs-fs/hubfs/image-png-Oct-01-2026-07-52-09-2206-PM.png?width=1372&height=1134&name=image-png-Oct-01-2026-07-52-09-2206-PM.png) 3. In the DevTools panel, select the **Network** tab. The tool automatically begins recording network activity. ![](https://knowledgebase.cybernut.com/hs-fs/hubfs/image-png-Oct-01-2026-07-53-06-0955-PM.png?width=1708&height=840&name=image-png-Oct-01-2026-07-53-06-0955-PM.png) 4. Select **Keep log**. ![](https://knowledgebase.cybernut.com/hs-fs/hubfs/image-png-Oct-01-2026-07-54-07-4947-PM.png?width=1278&height=648&name=image-png-Oct-01-2026-07-54-07-4947-PM.png) 5. Click block **Clear network log**. ![](https://knowledgebase.cybernut.com/hs-fs/hubfs/image-png-Oct-01-2026-07-54-58-1146-PM.png?width=1042&height=564&name=image-png-Oct-01-2026-07-54-58-1146-PM.png) 6. Reproduce the issue by clicking Report Email. ![](https://knowledgebase.cybernut.com/hs-fs/hubfs/image-png-Oct-01-2026-07-56-03-8022-PM.png?width=1250&height=772&name=image-png-Oct-01-2026-07-56-03-8022-PM.png) 7. When you're done reproducing the issue, click download **Export HAR (sanitized)** and save the generated HAR file. ![](https://knowledgebase.cybernut.com/hs-fs/hubfs/image-png-Oct-01-2026-07-56-55-8220-PM.png?width=1348&height=630&name=image-png-Oct-01-2026-07-56-55-8220-PM.png) 8. Name the file cybernut\_error. 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