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Capturing a HAR File

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What is a HAR file?

HAR stands for HTTP Archive, and is a file containing information about HTTP events that occur within your web broser. It is essential for troubleshooting issues that may not show any output in log files, but present themselves within the web browser.

 

How do I generate a HAR file?

Generally, if you are experiencing an issue where a HAR file is needed, we would suggest trying to reproduce the issue in different web browsers, and with all extensions disabled first. That said, the process to generate a HAR file will be different depending on the web browser that you are using.

 

Microsoft Edge

  • Open the Developer Tools from the menu (Menu > More Tools > Developer tools), or by pressing F12 (or Fn-F12) on your keyboard.
  • Open the Network tab (you may need to press the >> button to show more options).
  • Look for a round button at the top left of the Network tab. Make sure it's red. If it's grey, click it once to start recording.
  • Turn on "Preserve log".
  • Reproduce the issue.
  • Save the capture by right-clicking on the grid and choosing "Save as HAR with Content".

Edge.png

 

Google Chrome

  • Open the Developer Tools from the menu (Menu > More Tools > Developer tools), or by pressing F12 (or Fn-F12) on your keyboard.
  • Click on the Network tab (you may need to press the >> button to show more options).
  • Look for a round button at the top left of the Network tab. Make sure it's red. If it's grey, click it once to start recording.
  • Turn on "Preserve log".
  • You can use the clear button (a circle with a diagonal line through it) right before trying to reproduce the issue to remove unnecessary header information.
  • Reproduce the issue.
  • Save the capture by right-clicking on the grid and choosing "Save as HAR with Content".

Chrome.png

 

Mozilla Firefox

  • Start Firefox Developer Tools in Network mode (Top right menu > Developer > Network, or Ctrl-Shift-E / Cmd-Alt-E on macOS).
  • Turn on "Persist logs" on the right.
  • Reproduce the issue.
  • Save the capture by right-clicking on the grid and choosing "Save all as HAR".

Firefox.png

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