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Using Network Logs (HAR) for Debugging

Updated 2026-04-16

A Network Log (HAR) (HTTP Archive file) is a log of network activity between a browser and a server. It captures detailed information about requests and responses, including headers, payloads, timings, and more. In CheckView, you can download a Network Log (HAR) for each test run to debug issues or provide additional context to CheckView support for troubleshooting.

What is a Network Log (HAR)?

A Network Log (HAR) is a JSON-formatted file that records network requests made during a browser session, including:

  • Request and response headers.

  • HTTP methods (e.g., GET, POST).

  • Status codes (e.g., 200 OK, 404 Not Found).

  • Timing information (e.g., DNS lookup time, connection time).

Network Logs (HAR) are essential for debugging web application issues such as:

  • Slow page load times.

  • Missing or incorrect server responses.

  • JavaScript errors impacting test flows.

  • Redirects or blocked resources.

Downloading a Network Log (HAR)

  • Run a Test: Execute a scheduled or manual test in CheckView.

  • Navigate to the Test Results page for the completed test.

  • Save the file to your local device.

Debugging a Network Log (HAR)

To analyze a Network Log (HAR), you can use tools like Google HAR Analyzer. Here’s how to debug using this tool:

  • Open the HAR Analyzer

  • Drag and drop your Network Log (HAR) or click to upload it.

  • Examine Network Activity: Look for failed requests, such as those with 4xx or 5xx status codes.

  • Analyze slow requests or bottlenecks (e.g., large payloads, long connection times).

  • Review blocked resources or errors related to third-party services (e.g., APIs, CDNs).

  • Focus on Key Areas: Check requests related to the test flow (e.g., form submissions, AJAX calls).

  • Validate that the expected data was sent and received.

  • Identify unexpected redirects or authentication failures.

Pro Tip: Use the Network Log (HAR) alongside the CheckView video recording and test logs for a comprehensive view of what went wrong during the test.

How Network Logs (HAR) Help Support

If you’re unable to resolve an issue using the Network Log (HAR):

  • Share the Network Log (HAR) with CheckView support when reporting a problem. The file provides detailed context about: Errors or unexpected server behavior.

  • Slow or incomplete responses from the server.

  • Missing elements or resources that impacted the test flow.

Pro Tip: When sending a Network Log (HAR) to support, include additional details such as the Test ID, a description of the issue, and any relevant steps taken during troubleshooting.

Network Logs (HAR) are a valuable resource for diagnosing test-related issues in CheckView. Contact our support if you have any questions regarding Network Logs (HAR).

Tip: For automated failure analysis, try the AI Test Failure Summaries feature. It analyzes network data, screenshots, and console logs automatically to explain why a test failed.