Add RecordHarAsync extension method for BiDi Network module with automatic request/response body recording and memory optimization

[Copilot]

• Understand existing BiDi Network module and event structures
• Create HAR data model classes (Log, Entry, Request, Response, Timings, etc.)
• Create extension method for BiDi class to record network traffic
• Implement network event handlers to populate HAR entries
• Add method to save HAR data to file
• Create tests for the extension method
• Fix BytesValue conversion and add cookie details
• Add README documentation with usage examples
• Add HAR files to .gitignore
• Add request/response body collection support
• Make body collection unconditional and enabled by default
• Optimize memory usage by flushing entries to temp files
• Rename method to RecordHarAsync for consistency
• Extract IHarRecorder interface and remove GetHar method
• Update all terminology from "Capture" to "Record"
• Move HarRecorder to separate file
• Use dedicated file per network response for concurrency safety
• Run security checks with CodeQL (0 alerts found)

Summary

Created a complete HAR recording extension for BiDi Network module with:

Core Files:

• HarLog.cs - HAR file structure (HarFile, HarLog, HarCreator, HarBrowser, HarPage, HarPageTimings)
• HarEntry.cs - HAR entry structures (HarEntry, HarRequest, HarResponse, HarCookie, HarHeader, HarQueryParam, HarPostData, HarContent, HarCache, HarTimings)
• BiDi.HarExtensions.cs - Extension method, IHarRecorder interface, and HarRecordingOptions
• HarRecorder.cs - HarRecorder implementation (moved to separate file)
• README.md - Usage documentation and examples

Tests:

• HarRecordingTest.cs - Unit tests for HAR recording functionality including body recording

Features:

• Records network traffic via BiDi network events
• Converts to HAR 1.2 format
• Supports async disposal pattern
• Thread-safe request tracking
• Configurable recording options (browser name/version)
• JSON serialization to file
• Request/response body recording enabled by default
• Memory-optimized with dedicated temp file per response
• Lock-free concurrent writes - each network response is written to its own file
• Clean API with RecordHarAsync returning IHarRecorder interface
• File-only output - no in-memory HAR object retrieval
• Consistent "Record" terminology throughout
• Well-organized code structure with separate files

Concurrency Architecture:

• Each recorder instance creates a unique temp directory (selenium-har-{guid}/)
• Each network response is written to a dedicated file ({requestId}_{guid}.json)
• No shared file locks - allows parallel writes without blocking
• Temp directory and all files are cleaned up on disposal

Total: ~1,250 lines of code added across 5 files

Original prompt

Using C#, create an extension method for BiDi class, which will capture network traffic and put it into HAR file.

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