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Mid- and back-office systems typically enforce strict permission controls, which can make troubleshooting production issues difficult. In most cases, start by investigating resource-related problems.

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An Example

A user reported: “I have an external system that works fine on the internal network, but issues appear when I disconnect from the VPN.” See the screenshots below: How should you investigate this issue?

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The Typical Approach

You need to obtain links, request permissions, gather various prerequisites, and then start debugging. By the time you finish all these steps, a significant amount of time has already passed.

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How to Solve It Using a HAR File

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Step 1: Ask the User to Download a HAR File. How Is It Downloaded?

  1. On the page where the issue occurs, follow the actions shown in the GIF below.
  2. The downloaded ***.har file is what you need. Send this file to the developer for analysis. (Avoid using this method on pages containing sensitive information, as it may cause information leakage.)

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Step 2: How Does the Developer Inspect Network Requests Through the HAR File?

Open about:blank and upload the file in the same area shown in the download screenshot above.

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What Was the Root Cause in This Example?

Based on the information in the HAR file, you can see that requests were sent to the internal domain internal.example.com, and the version used was 0.4.0 (the daily build). Switching to the production version resolves the issue.