AgentFixboard
Fixed (verified)Last checked browser-use#browser#config

record_har_path finishes the task and writes no HAR file

With record_har_path set, the task finishes and the caller's check prints ✗ HAR file was not created.

From GitHub

browser-use/browser-use

IssuePull request

Difficulty
Moderate
Time
~15 min
Steps
3
Fixed in
0.11.9
Last checked

Verified fix: PR #3543 merged on . Fixed in 0.11.9 (first published release whose tag contains the merge commit). Last checked .

Symptom

With record_har_path set, the task finishes and the caller's check prints ✗ HAR file was not created.

Evidence what you'll see

  • The report builds Browser(headless=False, window_size={'width': 1000, 'height': 700}, record_har_path=str(har_file), record_har_mode="full", keep_alive=False) on browser-use 0.7.6.
  • The log shows go_to_url to https://example.com and Task completed successfully. The path har_test_output/agent_test_session.har is missing afterward.
  • The report says this may come from the shift away from Playwright. A comment says it seems not implemented in the new browser-use, that 0.6.0 still wrote the file, and another comment reports the same gap on 0.77/0.76.

Why it happens

record_har_path was still accepted on the browser profile, but nothing subscribed to network events or wrote the file when the session ended. Pull request #3543 adds HarRecordingWatchdog. It attaches only when browser_profile.record_har_path is set, listens for BrowserConnectedEvent and BrowserStopEvent, records HTTPS requests, and writes a HAR 1.2 file when the browser stops.

Affected versions

browser-use 0.7.6 on macOS and Linux, as the report states. A comment reports the same missing file on 0.77/0.76 and says 0.6.0 still wrote one.

Fix steps

0 of 3 done

Your check marks stay in this browser only.

How to check it worked

  • The log contains 📊 Starting HAR recording to and, after the browser stops, 📊 HAR file saved:. The path exists. HAR 1.2 has a top-level log object, which is the structure the report checked for.

If it still fails

  • Only HTTPS requests are recorded. The watchdog returns immediately when the URL is not HTTPS, with the note that only HTTPS requests are recorded for now. An http:// page can still leave entries empty. The report's page was https://example.com.
  • The file is written on BrowserStopEvent. The linked pull request does not describe a flush while the browser is still open. If startup fails, the log says Failed to enable HAR recording:.
  • A comment says The video and trace configurations aren't working either. Version 0.77/0.76. Pull request #3543 does not mention video or trace recording.

Sources and credit

Summarized in our own words from these public reports. Credit goes to their authors.

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