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The Capture HAR File command (Command Type: 23) captures a HAR file from the browser, recording all network requests and responses made during the capture period.

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Command Type

Command Type ID: 23

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Parameters

ParameterTypeDescriptionRequired
timeoutnumberTimeout in milliseconds (defines the capture duration)Yes

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Usage Examples

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Capture HAR for 10 Seconds

{
  "command": "capture-har-file",
  "params": {
    "timeout": 10000
  }
}

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Common Use Cases

  • Network Debugging: Capture all XHR/fetch calls made by a page during load
  • API Discovery: Identify undocumented API endpoints by observing network traffic
  • Performance Analysis: Record timing information for all network requests