Fix cdp setting with managed browser #1572
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…rency - Modify get_page() to always create new pages instead of reusing existing ones - Add page lock to serialize new page creation in managed browser context - Improve subprocess argument formatting and cleanup logging - Delegate profile-related static methods to BrowserProfiler class - Enhance startup checks for managed browser processes - Add comprehensive test suite validating concurrency fix for arun_many with CDP browsers - Fix proxy flag formatting and deduplicate browser launch args - Refactor imports and code formatting for clarity and consistency
… concurrency - Modify get_page() to always create new pages instead of reusing existing ones - Add page lock to serialize new page creation in managed browser context - Improve subprocess argument formatting and cleanup logging - Delegate profile-related static methods to BrowserProfiler class - Enhance startup checks for managed browser processes - Add comprehensive test suite validating concurrency fix for arun_many with CDP browsers - Fix proxy flag formatting and deduplicate browser launch args - Refactor imports and code formatting for clarity and consistency
Contributor
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I was eagerly anticipating this pull request to land. Great job guys |
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Hi team, thank you for all the hard work! any way we can help here to move this PR forward? This solves a bug that we have been encountering using cdp. |
Collaborator
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Hi there! We will include this in our next release in two weeks. Stay tuned! 💜 |
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Summary
This PR fixes a concurrency bug in AsyncWebCrawler.arun_many() when using managed browsers. The issue was that all concurrent crawl tasks were fighting over one shared tab, causing failures. The fix modifies the get_page() method in browser_manager.py to always create new pages instead of reusing context.pages[0] for managed browsers.
Fixes #1563
List of files changed and why
crawl4ai/browser_manager.py - Modified the get_page() method to create new pages for managed browsers instead of reusing the first page, which was causing tab contention in concurrent scenarios.
tests/test_cdp_concurrency_compact.py - Created a comprehensive test suite that verifies the concurrency fix works correctly across multiple scenarios including basic arun_many functionality, managed CDP browsers, and various concurrency patterns.
How Has This Been Tested?
Created and ran a comprehensive test suite with 6 different test scenarios:
All tests pass successfully, demonstrating that:
Manual verification of the fix with both basic and managed browser configurations.
Checklist: