Improve reading .har file in OpenaiChat

[hlohaus]

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[github-actions]

Pull Request Review

Author: H Lohaus

Title: Improve reading .har file in OpenaiChat

Thank you for contributing to the project! Your changes to improve the reading of .har files in the OpenaiChat provider are appreciated.

Summary of Changes

• Updated the way user-agent is accessed to use get() for safer retrieval.
• Improved header handling by ensuring consistent casing for header keys.
• Enhanced error handling when reading tokens from headers, making the code more robust.

Code Review

• The use of cls._headers.get("user-agent") is a good improvement as it prevents potential KeyError exceptions.
• The consistent casing of headers (e.g., changing "Openai-Sentinel-Proof-Token" to "openai-sentinel-proof-token") aligns with common practices and improves readability.
• The restructuring of the error handling logic makes the code cleaner and easier to maintain.

Suggestions

• Consider adding comments to explain the purpose of certain blocks of code, especially where tokens are being parsed. This will help future maintainers understand the logic more quickly.
• It might be beneficial to include unit tests to cover the new functionality introduced in this pull request.

Overall, great work on this improvement! Looking forward to seeing more contributions from you in the future.